CA2841043A1 - Compositions for growth and vigour from oilseeds - Google Patents
Compositions for growth and vigour from oilseeds Download PDFInfo
- Publication number
- CA2841043A1 CA2841043A1 CA2841043A CA2841043A CA2841043A1 CA 2841043 A1 CA2841043 A1 CA 2841043A1 CA 2841043 A CA2841043 A CA 2841043A CA 2841043 A CA2841043 A CA 2841043A CA 2841043 A1 CA2841043 A1 CA 2841043A1
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- CA
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- Prior art keywords
- wax
- organic material
- particles
- coating composition
- oilseeds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
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- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/24—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing ingredients to enhance the sticking of the active ingredients
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- A—HUMAN NECESSITIES
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- A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
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- C—CHEMISTRY; METALLURGY
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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Abstract
Coating composition for applying to oilseeds from which roots and shoots are capable of growing, wherein the said coating composition comprises one or more organic materials having a melting point of = 50°Centigrade and one or more additives, methods of making such compositions and coated seeds of oilseed plants.
Description
COMPOSITIONS FOR GROWTH AND VIGOUR FROM OILSEEDS
The present invention relates to coating compositions including an organic component for applying to seeds of oilseed plant from which roots and shoots are capable of growing, uses of coating compositions on oilseed plant seeds, methods of producing such coating compositions and oilseed plant seed coated with such coating compositions. In particular, the invention relates to coating compositions that comprise an organic material that provides protection from environmental stresses to oilseed plant seed.
Young oilseed plants grown from oilseed plant seed are vulnerable to abiotic and environmental stresses, particularly in growing habitats that have low rainfall and/or sub-optimal soil quality. Losses due to sub-optimal soil quality are typically realised in the growth of young plants lacking plant vigour in which the plants do not become well established, such as where the rooting systems do not develop and in circumstances where essential elements in the soil are not readily available. Agronomic losses due to young oilseed plants not being well established remain unacceptably high on soils which are for example mineral deficient despite the employment of conventional inorganic oilseed plant seed coatings that typically include essential elements for establishing young seedlings. A
problem with the use of such conventional coatings is that they introduce nutrients to the soil in unbalanced quantities and this can have adverse effects on plant growth and vigour in unforeseen ways.
Additionally, such conventional coatings are typically applied in the form of wet slurries to oilseed plant seeds. Once applied, the coatings are typically dried on the seeds and this drying may cause further abiotic stresses, which in turn may have deleterious consequences on the viability of young plants grown therefrom. Additionally, such conventionally applied coatings may not be applied to oilseed plant seeds evenly, and as a consequence, such coatings tend to be susceptible to chipping and/or flaking. Furthermore, the degree of coating uniformity of such conventionally applied coatings typically is not optimal, with a percentage of seeds of any one batch receiving little or no coating depending on the coating method being deployed.
In the following description, the terms "oilseed treatment" and "oilseed coating" are used interchangeably for the compositions of the invention and their uses to treat oilseed plant seeds, by any of the specific methods described in the prior art that provide an improvement, typically an enhancement, of seedling vigour. The commonly used ingredients in oilseed =
plant seed treatment compositions (sometimes designated as formulations) include antidotes and safeners; fertilisers, micronutrients and inoculants; bioregulators of natural or synthetic origin which are either hormones or interfere in hormone metabolism and do not influence plant nutrition; and/or bioregulators which interfere with plant growth by enhancing nutrient uptake.
The present invention relates to coating compositions including an organic component for applying to seeds of oilseed plant from which roots and shoots are capable of growing, uses of coating compositions on oilseed plant seeds, methods of producing such coating compositions and oilseed plant seed coated with such coating compositions. In particular, the invention relates to coating compositions that comprise an organic material that provides protection from environmental stresses to oilseed plant seed.
Young oilseed plants grown from oilseed plant seed are vulnerable to abiotic and environmental stresses, particularly in growing habitats that have low rainfall and/or sub-optimal soil quality. Losses due to sub-optimal soil quality are typically realised in the growth of young plants lacking plant vigour in which the plants do not become well established, such as where the rooting systems do not develop and in circumstances where essential elements in the soil are not readily available. Agronomic losses due to young oilseed plants not being well established remain unacceptably high on soils which are for example mineral deficient despite the employment of conventional inorganic oilseed plant seed coatings that typically include essential elements for establishing young seedlings. A
problem with the use of such conventional coatings is that they introduce nutrients to the soil in unbalanced quantities and this can have adverse effects on plant growth and vigour in unforeseen ways.
Additionally, such conventional coatings are typically applied in the form of wet slurries to oilseed plant seeds. Once applied, the coatings are typically dried on the seeds and this drying may cause further abiotic stresses, which in turn may have deleterious consequences on the viability of young plants grown therefrom. Additionally, such conventionally applied coatings may not be applied to oilseed plant seeds evenly, and as a consequence, such coatings tend to be susceptible to chipping and/or flaking. Furthermore, the degree of coating uniformity of such conventionally applied coatings typically is not optimal, with a percentage of seeds of any one batch receiving little or no coating depending on the coating method being deployed.
In the following description, the terms "oilseed treatment" and "oilseed coating" are used interchangeably for the compositions of the invention and their uses to treat oilseed plant seeds, by any of the specific methods described in the prior art that provide an improvement, typically an enhancement, of seedling vigour. The commonly used ingredients in oilseed =
plant seed treatment compositions (sometimes designated as formulations) include antidotes and safeners; fertilisers, micronutrients and inoculants; bioregulators of natural or synthetic origin which are either hormones or interfere in hormone metabolism and do not influence plant nutrition; and/or bioregulators which interfere with plant growth by enhancing nutrient uptake.
2 It has now been found that by using certain organic materials as components of coatings on oilseed plant seeds, together with the application of inorganic components and/or biological agents, plant vigour and plant growth of plant seedlings grown from oilseed plant seeds is improved relative to the plant vigour and plant growth of seedlings grown from conventionally treated seeds. It has further been found that the quantity of additives, particularly inorganic fertilisers that is required per unit of oilseed plant seed weight is less than that required using conventional farming techniques.
It is an object of the present invention to supply improved oilseed plant seed coatings comprising organic components for oilseed plant seeds.
It is a further object of the present invention to provide improved oilseed plant seed coatings comprising a minimum amount of additives.
These and other objects of the invention will become apparent from the following description and examples.
According to the present invention there is provided an oilseed coating composition in the form of organic material in particulate form that comprises i) at least one organic material selected from waxes having a melting point of ?_50 Centigrade; and ii) at least one additive for enhancing seedling vigour and/or seedling growth from oilseed plant seed wherein the at least one additive is selected from one or more inorganic additives and/or one or more live biological agents.
The organic materials of use in the invention act as a carrier for desired additives for placing on or near to seeds.
For the purposes of the present invention an "oilseed plant seed" is one from which roots and shoots are able to grow. Reference to "oilseed plant seed" and "oilseed plant seeds" is used interchangeably herein and means seeds, typically viable seeds, to which compositions of the invention may be applied. Furthermore, "oilseed plant seed" and "oilseed plant seeds"
as provided herein means seeds that are capable of germinating to at least conventional levels of germination typical of the relevant oilseed plant species under consideration.
"oilseed plants" for the purposes of the present invention are ones which are recognised as such by the skilled addressee. Oilseed plant seeds suitable for coating with compositions of the invention include those that may be used for the planting of oilseed plants include those selected from members of the Crucifer family (Canola (B. campestris) and oilseed rape (B.
napus), sunflower, peanut, safflower, sesame, nut oils, carob, coriander, mustard, grape,
It is an object of the present invention to supply improved oilseed plant seed coatings comprising organic components for oilseed plant seeds.
It is a further object of the present invention to provide improved oilseed plant seed coatings comprising a minimum amount of additives.
These and other objects of the invention will become apparent from the following description and examples.
According to the present invention there is provided an oilseed coating composition in the form of organic material in particulate form that comprises i) at least one organic material selected from waxes having a melting point of ?_50 Centigrade; and ii) at least one additive for enhancing seedling vigour and/or seedling growth from oilseed plant seed wherein the at least one additive is selected from one or more inorganic additives and/or one or more live biological agents.
The organic materials of use in the invention act as a carrier for desired additives for placing on or near to seeds.
For the purposes of the present invention an "oilseed plant seed" is one from which roots and shoots are able to grow. Reference to "oilseed plant seed" and "oilseed plant seeds" is used interchangeably herein and means seeds, typically viable seeds, to which compositions of the invention may be applied. Furthermore, "oilseed plant seed" and "oilseed plant seeds"
as provided herein means seeds that are capable of germinating to at least conventional levels of germination typical of the relevant oilseed plant species under consideration.
"oilseed plants" for the purposes of the present invention are ones which are recognised as such by the skilled addressee. Oilseed plant seeds suitable for coating with compositions of the invention include those that may be used for the planting of oilseed plants include those selected from members of the Crucifer family (Canola (B. campestris) and oilseed rape (B.
napus), sunflower, peanut, safflower, sesame, nut oils, carob, coriander, mustard, grape,
3 linseed (flax), dika, hemp, okra, pine, poppy, castor, jojoba and the like.
Generally, the particles of use in seed coating compositions of the invention possess a volume mean diameter of a certain size as defined herein. To obtain particles of organic materials of a volume mean diameter applicable for use in the invention, organic materials in the form of, for example, 1 to 5 kilogram blocks or tablets may be broken up or kibbled into small millimetre-sized pieces (such as from 2mm ¨ 8mm approximate diameter in size, for example from 4mm to 6mm) in a kibbling machine. The millimetre-sized pieces can then be passed through a comminuting means such as a standard mill, e.g. an Apex Comminuting mill, and milled or comminuted into particles having an approximate diameter in the range from 100pm - 500pm, for example from 250pm - 300pm. The micron-sized comminuted particles can then be passed through a micronising apparatus, such as an AFG
micronising air mill to obtain particles of a desired VMD range, such as from 15pm - 20pm, that is of use in the present invention. The skilled addressee will appreciate that such procedures for obtaining small particles are well known in the art. Preferably, dry powder compositions of the invention comprise composite particles having a volume mean diameter of al Opm, for example of 10pm, 11pm, 12pm, 13pm, 14pm, 15pm up to 40pm or any value thereinbetween. As stated herein, the volume mean diameter of the composite particles is typically .?_10pm or ?..12pm and may lie in the range from 10pm to 200pm and may have a value that lies anywhere there inbetween, for example from .10pm to 100pm; or from ?_10pm to 40pm; or from .-10pm to 30pm or any desired volume mean diameter value in between. Preferably, dry powder compositions of the invention comprise particles having a volume mean diameter of ?.10pm, for example of 10pm, 11pm, 12pm, 13pm, 14pm, 15pm and the like up to any volume mean diameter of choice, such as up to 200pm or any volume mean diameter in between for example 40pm or 30pm. Such compositions are considered to be less of a thoracic hazard to humans and are not thought to be allergenic.
The organic material used in the present invention is selected from organic materials that can be applied to oilseed plant seeds either as a powder wherein the powder particles are of a pre-determined volume mean diameter (VMD) or the powder particles are applied in liquid form, such as an oleaginous formulation or as an aqueous formulation. In liquid formulations, particles of a pre-determined volume mean diameter are suspended therein in a suspension formulation and applied to oilseed plant seeds, which are then dried using conventional drying procedures. Preferably, the organic material is applied to oilseed plant seeds in a dry powder form. Such organic materials include additives as herein defined and may include added further components such as added UV blockers or added antioxidants or the like. Dry powders of the present invention may be made up of one or more organic materials that have a melting point at or above 50 C and which are of use in the present invention.
Suitable organic materials of use in the invention include waxes having a melting point of
Generally, the particles of use in seed coating compositions of the invention possess a volume mean diameter of a certain size as defined herein. To obtain particles of organic materials of a volume mean diameter applicable for use in the invention, organic materials in the form of, for example, 1 to 5 kilogram blocks or tablets may be broken up or kibbled into small millimetre-sized pieces (such as from 2mm ¨ 8mm approximate diameter in size, for example from 4mm to 6mm) in a kibbling machine. The millimetre-sized pieces can then be passed through a comminuting means such as a standard mill, e.g. an Apex Comminuting mill, and milled or comminuted into particles having an approximate diameter in the range from 100pm - 500pm, for example from 250pm - 300pm. The micron-sized comminuted particles can then be passed through a micronising apparatus, such as an AFG
micronising air mill to obtain particles of a desired VMD range, such as from 15pm - 20pm, that is of use in the present invention. The skilled addressee will appreciate that such procedures for obtaining small particles are well known in the art. Preferably, dry powder compositions of the invention comprise composite particles having a volume mean diameter of al Opm, for example of 10pm, 11pm, 12pm, 13pm, 14pm, 15pm up to 40pm or any value thereinbetween. As stated herein, the volume mean diameter of the composite particles is typically .?_10pm or ?..12pm and may lie in the range from 10pm to 200pm and may have a value that lies anywhere there inbetween, for example from .10pm to 100pm; or from ?_10pm to 40pm; or from .-10pm to 30pm or any desired volume mean diameter value in between. Preferably, dry powder compositions of the invention comprise particles having a volume mean diameter of ?.10pm, for example of 10pm, 11pm, 12pm, 13pm, 14pm, 15pm and the like up to any volume mean diameter of choice, such as up to 200pm or any volume mean diameter in between for example 40pm or 30pm. Such compositions are considered to be less of a thoracic hazard to humans and are not thought to be allergenic.
The organic material used in the present invention is selected from organic materials that can be applied to oilseed plant seeds either as a powder wherein the powder particles are of a pre-determined volume mean diameter (VMD) or the powder particles are applied in liquid form, such as an oleaginous formulation or as an aqueous formulation. In liquid formulations, particles of a pre-determined volume mean diameter are suspended therein in a suspension formulation and applied to oilseed plant seeds, which are then dried using conventional drying procedures. Preferably, the organic material is applied to oilseed plant seeds in a dry powder form. Such organic materials include additives as herein defined and may include added further components such as added UV blockers or added antioxidants or the like. Dry powders of the present invention may be made up of one or more organic materials that have a melting point at or above 50 C and which are of use in the present invention.
Suitable organic materials of use in the invention include waxes having a melting point of
4 ?50 C, more preferably of ?_60 C, and most preferably are made up of hard waxes having a melting point of ?-70 C. Suitable organic materials of use in the invention include waxes selected from natural, synthetic and mineral waxes. Examples of natural waxes of use in the present invention include carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, myricyl palmitate, cetyl palmitate, candelilla wax, castor wax, ouricury wax, sugar cane wax, retamo wax, rice bran wax and the like. In a preferment, the organic material is selected from carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, myricyl palmitate, cetyl palmitate, candelilla wax, castor wax, ouricury wax, and rice bran wax; or a mixture of two or more thereof.
Synthetic waxes of use in the present invention include suitable waxes selected from paraffin wax, microcrystalline wax, Polyethylene waxes, Fischer-Tropsch waxes, substituted amide waxes, polymerized a-olefins and the like.
Mineral waxes of use in the invention include montan wax (e.g. Lumax0 Bayer) ceresin wax, ozocerite, peat wax and the like.
Waxes of use in the invention typically display a high enthalpy of lattice energy during melt.
Preferably the organic material is carnauba wax which may be applied in liquid form, typically in the form of a suspension, or powder form as discrete particles.
Preferably, the organic material is applied in dry powder form to oilseed plant seeds.
Generally, the particles of use in the invention possess a volume mean diameter of a1Opm, such as .?_12pm such as in the range of from ?_10pm to 200pm, for example from ?.10pm to 100pm; or from _10pm to 40pm; or from ?..10pm to 30pm or any desired volume mean diameter value in between. The skilled addressee will appreciate that the actual VMD of particles of use in the invention that are used on oilseed plant seed will be appropriate to the size of the seeds to which the particles are to be applied. Furthermore, the skilled addressee will also appreciate that where the VMD is defined as being ?.10pm or ..12pm the size of the particles will be governed by the size of the seed to which it is applied and such a range should be construed as being commensurate therewith. Thus, the size range of particles of use in the invention is not open-ended in respect of an upper size limit but only insofar as such a limit is applicable to oilseed plant seed to which particles of the invention may be expected to adhere as a coating. The limit in the sizing of the particles of use in seed coatings of the invention will be apparent to the skilled addressee for oilseed plant seed.
The one or more additives for enhancing seedling vigour and/or seedling growth from oilseed plant seeds may be selected from one or more inorganic or chemical additives and/or one or more live biological agents.
Suitable inorganic agents include commercially available NPK fertilisers that may be added oilseed plant seed coatings of the invention. These may be added in the form of dry powders of soluble ions that include the so-called primary macronutrients such as nitrogen, phosphorus, and potassium; the so-called secondary macronutrients such as calcium, sulphur, and magnesium; and the so-called "micronutrients" (trace minerals such as boron, chlorine, manganese, iron, zinc, copper, molybdenum, and selenium).
"Macronutrients" are taken up in relatively large quantities and are present in plant tissue in quantities from about 0.2% - 4% on a dry weight basis. "Micronutrients" are taken up in smaller quantities and are present in plant tissue in quantities measured in parts per million (ppm), ranging from about
Synthetic waxes of use in the present invention include suitable waxes selected from paraffin wax, microcrystalline wax, Polyethylene waxes, Fischer-Tropsch waxes, substituted amide waxes, polymerized a-olefins and the like.
Mineral waxes of use in the invention include montan wax (e.g. Lumax0 Bayer) ceresin wax, ozocerite, peat wax and the like.
Waxes of use in the invention typically display a high enthalpy of lattice energy during melt.
Preferably the organic material is carnauba wax which may be applied in liquid form, typically in the form of a suspension, or powder form as discrete particles.
Preferably, the organic material is applied in dry powder form to oilseed plant seeds.
Generally, the particles of use in the invention possess a volume mean diameter of a1Opm, such as .?_12pm such as in the range of from ?_10pm to 200pm, for example from ?.10pm to 100pm; or from _10pm to 40pm; or from ?..10pm to 30pm or any desired volume mean diameter value in between. The skilled addressee will appreciate that the actual VMD of particles of use in the invention that are used on oilseed plant seed will be appropriate to the size of the seeds to which the particles are to be applied. Furthermore, the skilled addressee will also appreciate that where the VMD is defined as being ?.10pm or ..12pm the size of the particles will be governed by the size of the seed to which it is applied and such a range should be construed as being commensurate therewith. Thus, the size range of particles of use in the invention is not open-ended in respect of an upper size limit but only insofar as such a limit is applicable to oilseed plant seed to which particles of the invention may be expected to adhere as a coating. The limit in the sizing of the particles of use in seed coatings of the invention will be apparent to the skilled addressee for oilseed plant seed.
The one or more additives for enhancing seedling vigour and/or seedling growth from oilseed plant seeds may be selected from one or more inorganic or chemical additives and/or one or more live biological agents.
Suitable inorganic agents include commercially available NPK fertilisers that may be added oilseed plant seed coatings of the invention. These may be added in the form of dry powders of soluble ions that include the so-called primary macronutrients such as nitrogen, phosphorus, and potassium; the so-called secondary macronutrients such as calcium, sulphur, and magnesium; and the so-called "micronutrients" (trace minerals such as boron, chlorine, manganese, iron, zinc, copper, molybdenum, and selenium).
"Macronutrients" are taken up in relatively large quantities and are present in plant tissue in quantities from about 0.2% - 4% on a dry weight basis. "Micronutrients" are taken up in smaller quantities and are present in plant tissue in quantities measured in parts per million (ppm), ranging from about
5 ¨ 200 ppm, or less than 0.02% dry weight.
Additives may be selected from bioregulators commonly applied in the art such as brassinosteroids, cytokinines e.g. kinetin or zeatin, the auxins e.g.
indolylacetic acid or indolylacetyl aspartate, the flavonoids and isoflavanoids e.g. formononetin or diosmetin, the phytoaixins e.g. glyceolline, phytoalexin-inducing oligosaccharides such as pectin, chitin, chitosan, polygalacturonic acid and oligogalacturonic acid, compounds such as the gibellerins produced by rhizobial symbionts and endophytic microorganisms such as acetobacter diazotrophicus and herbaspitillum seropedicae and the like.
Species of mycorrhizal fungus are also capable of augmenting levels of available nutrients in the soil with further organic and inorganic nutrients that are assimilable by a crop plant.
Suitable species of mycorrhizal fungus include those that are capable of colonising a host plant's roots, either intracellularly as in arbuscular mycorrhizal fungi (AMF), or extracellularly as in ericoid mycorrhizal (EM) fungi.
Examples of AMF mycorrhizae of potential use in the invention include those from the Glomus, Gigaspora, Acaulospora and Sclerocystis. Suitable species include Glomus fasciculatum, G. intraradices, G. claroideum; G. intra, G. clarum, G.
brasilianum, G.
deserticola, G. monosporus, G. mosseae, G.tortuosum, G, sinuosum, Gigaspora margarita, Gigaspora gigantean and Acaulospora longular.
Ericoid mycorrhizas (EM) are known to have saprotrophic capabilities and these are thought to enable plants to receive nutrients from not-yet-decomposed materials via the decomposing actions of their ericoid partners. A suitable genus of EM of potential use in the invention is Pezizella.
Species of bacteria and fungi of potential use in the invention include those that are capable of acting on an inorganic and/or organic substrate to release phosphorus-containing compounds in soluble form from such substrates. Species of bacteria include those from Alcaligenes, Acinetobacter, Azospirillum, Bacillus, Enterobacter, Erwinia, Flavobacterium,
Additives may be selected from bioregulators commonly applied in the art such as brassinosteroids, cytokinines e.g. kinetin or zeatin, the auxins e.g.
indolylacetic acid or indolylacetyl aspartate, the flavonoids and isoflavanoids e.g. formononetin or diosmetin, the phytoaixins e.g. glyceolline, phytoalexin-inducing oligosaccharides such as pectin, chitin, chitosan, polygalacturonic acid and oligogalacturonic acid, compounds such as the gibellerins produced by rhizobial symbionts and endophytic microorganisms such as acetobacter diazotrophicus and herbaspitillum seropedicae and the like.
Species of mycorrhizal fungus are also capable of augmenting levels of available nutrients in the soil with further organic and inorganic nutrients that are assimilable by a crop plant.
Suitable species of mycorrhizal fungus include those that are capable of colonising a host plant's roots, either intracellularly as in arbuscular mycorrhizal fungi (AMF), or extracellularly as in ericoid mycorrhizal (EM) fungi.
Examples of AMF mycorrhizae of potential use in the invention include those from the Glomus, Gigaspora, Acaulospora and Sclerocystis. Suitable species include Glomus fasciculatum, G. intraradices, G. claroideum; G. intra, G. clarum, G.
brasilianum, G.
deserticola, G. monosporus, G. mosseae, G.tortuosum, G, sinuosum, Gigaspora margarita, Gigaspora gigantean and Acaulospora longular.
Ericoid mycorrhizas (EM) are known to have saprotrophic capabilities and these are thought to enable plants to receive nutrients from not-yet-decomposed materials via the decomposing actions of their ericoid partners. A suitable genus of EM of potential use in the invention is Pezizella.
Species of bacteria and fungi of potential use in the invention include those that are capable of acting on an inorganic and/or organic substrate to release phosphorus-containing compounds in soluble form from such substrates. Species of bacteria include those from Alcaligenes, Acinetobacter, Azospirillum, Bacillus, Enterobacter, Erwinia, Flavobacterium,
6 Paenibacillus, Pseudomonas, Rhizobium, Burkholderia, and Serratia. Examples of species of the Bacillus genus are Bacillus megaterium, Bacillus coagulans, species of the Azospirillum genus such as Azospirillum brasilense, species of the Pseudomonas genus, such as Pseudomonas aeruginosa, Pseudomonas aurantiaca, Pseudomonas putida, Pseudomonas pseudoalcaligenes, Pseudomonas fluorescens, Pseudomonas poae, and Pseudomonas trivialis, species of the Rhizobium genus such as Bradyrhizobium and Rhizobium leguminosarum, and species of the Paenibacillus genus (formerly considered as Bacillus genus) such as Paenibacillus lautus. Commonly used Rhizobium inoculants may be sourced from such companies as Becker Underwood and EMD Crop Bioscience.
A further live biological inoculant that is useful for oilseed plant seed coating is Trichoderma, a fungus that is capable of making available, and in the adsorption of, mineral nutrients from the soil such as by solubilising insoluble phosphorus and zinc in the soil.
Other capabilities of the fungus include the decomposition of organic matter thereby releasing calcium, potassium, and nitrogen available for plant use. By such capabilities certain Trichoderma species can be used to contribute to a balanced fertilisation of oilseed plants in the field and thereby the requirement for adding large amounts of artificial fertilisers may be reduced by as much as 50% depending on crop type. Trichoderma strains are known in the art, for example, useful strains are known from the University of the Philippines Los Banos (UPLB), Institute of Biological Sciences.
Examples of conventional additives for increasing fertiliser efficiency, plant productivity, growth, and nutrient accumulation may be sourced from such commercial sources as Incotec Inc., Germains, Bayer CropScience, and Becker Underwood. Suitable additives may be selected from commercially available products such as Auxigrow(R) (Auxein Corp., Lansing, Mich., USA) and Amisorb(R) (Donlar Corp., Chicago) or the so-called phytochelates described by A. M. Kinnersley in Plant Growth Regul. (1993), 12(3), 207-18, which are thought to influence the availability to the plant of minimal amounts of certain metals such as Zn, Fe, Cu and the like for optimal growth and productivity.
Examples of the latter include polymers of L-lactic acid, L-lactoyllactic acid and water-soluble polyaspartates.
Other additives that may be applied to oilseed plant seed coatings of the invention include the kinds of adjuvant that are found in conventional commercial agrochemical formulations.
Suitable additives for inclusion into oilseed plant seed coatings of the invention may be selected from those described by Chester L. Foy, Pestic. Sci.(1993) 38, pp.65-76; and in EP
0357559. Seed coating compositions of the invention may further include conventional additives such as agents having wetting, dispersing and de-foaming modes of action.
Suitable surface-active compounds are non-ionic, cationic and/or anionic surfactants having good emulsifying, dispersing and wetting properties. Such adjuvants for crop protection formulations are obtainable from fine chemicals producers [e.g. by Clariant AG
(Muttenz,
A further live biological inoculant that is useful for oilseed plant seed coating is Trichoderma, a fungus that is capable of making available, and in the adsorption of, mineral nutrients from the soil such as by solubilising insoluble phosphorus and zinc in the soil.
Other capabilities of the fungus include the decomposition of organic matter thereby releasing calcium, potassium, and nitrogen available for plant use. By such capabilities certain Trichoderma species can be used to contribute to a balanced fertilisation of oilseed plants in the field and thereby the requirement for adding large amounts of artificial fertilisers may be reduced by as much as 50% depending on crop type. Trichoderma strains are known in the art, for example, useful strains are known from the University of the Philippines Los Banos (UPLB), Institute of Biological Sciences.
Examples of conventional additives for increasing fertiliser efficiency, plant productivity, growth, and nutrient accumulation may be sourced from such commercial sources as Incotec Inc., Germains, Bayer CropScience, and Becker Underwood. Suitable additives may be selected from commercially available products such as Auxigrow(R) (Auxein Corp., Lansing, Mich., USA) and Amisorb(R) (Donlar Corp., Chicago) or the so-called phytochelates described by A. M. Kinnersley in Plant Growth Regul. (1993), 12(3), 207-18, which are thought to influence the availability to the plant of minimal amounts of certain metals such as Zn, Fe, Cu and the like for optimal growth and productivity.
Examples of the latter include polymers of L-lactic acid, L-lactoyllactic acid and water-soluble polyaspartates.
Other additives that may be applied to oilseed plant seed coatings of the invention include the kinds of adjuvant that are found in conventional commercial agrochemical formulations.
Suitable additives for inclusion into oilseed plant seed coatings of the invention may be selected from those described by Chester L. Foy, Pestic. Sci.(1993) 38, pp.65-76; and in EP
0357559. Seed coating compositions of the invention may further include conventional additives such as agents having wetting, dispersing and de-foaming modes of action.
Suitable surface-active compounds are non-ionic, cationic and/or anionic surfactants having good emulsifying, dispersing and wetting properties. Such adjuvants for crop protection formulations are obtainable from fine chemicals producers [e.g. by Clariant AG
(Muttenz,
7 Switzerland)] and include (fatty)alcohol alkylphenol ethoxylates, polyarylphenol ethoxylates, dispersing phosphates, taurides and/or alcohol monosuccinates. The term "surfactants" also comprises mixtures of two or more surfactants and natural or synthetic phospholipids of the cephatin and lecithin series, e.g. phosphatidyl-ethanolamine, phosphatidylserine, phosphatidylglycerol, lysolecithin sugar esters. A typical de-foaming agent is Fluowet PL80B(R) (Clariant AG) and typical antifreeze compounds are glycols and polyethylene glycols. Further ingredients may include solid or liquid substances ordinarily employed in formulation technology, e.g. natural or regenerated minerals, tackifiers, thickeners or binders. Other suitable additives are emulgating protein hydrolysates, e.g. as described in EP 0297426 (Bayer AG). Dyes often used in seed treatment compositions include water-insoluble or water-soluble dyes. Examples of dyes that may be added to compositions of the invention include Colanyl Red(R) (Clariant AG, Muttenz), Rhodamin B, white pigment (titanium dioxide) or Luconyl(R) (BASF AG). Altogether additives may be used to ensure that the formulation disperses well, does not settle or freeze and differentiates the seeds from untreated seeds. Other special additives which are known to enhance seedling vigour in particular in combination with certain pesticides, e.g. fungicides in combination with 3',4',5',6'-tetrachloro-2,4,5,7-tetraiodo-fluorescein (EP0297426), may be applied to the seeds in a combined amount that is effective, preferably synergistically effective, to increase seedling vigour and plant growth.
Additionally, the organic particles of use in compositions of the invention may contain other further components such as additives selected from UV blockers such as beta-carotene or p-amino benzoic acid, colouring agents such as optical brighteners and commercially available colouring agents such as food colouring agents, plasticisers such as glycerine or soy oil, antimicrobials such as potassium sorbate, nitrates, nitrites, propylene oxide and the like, antioxidants such as vitamin E, butylated hydroxyl anisole (BHA), butylated hydroxytoluene (BHT), and other antioxidants that may be present, or mixtures thereof. The skilled addressee will appreciate that the selection of such commonly included additives will be made depending on end purpose, and perceived need.
Seed compositions of the invention may be applied to oilseed plant seed at a rate of application from 0.1 g to 500 g, preferably from 1g to 100g, most preferably from 5g to 50g of the active ingredient (a.i.) per 100kg of seed.
Liquid formulations of the invention may be formulated as an aqueous formulation or as an oleaginous formulation, depending on design. Aqueous formulations may include surfactants selected from commercially available surfactants such as Tween 20, Silwet L77, Tween 80, Torpedo II, Newmans T80, Fortune, Guard, Rhino, Biopower, and the like.
Additionally, the organic particles of use in compositions of the invention may contain other further components such as additives selected from UV blockers such as beta-carotene or p-amino benzoic acid, colouring agents such as optical brighteners and commercially available colouring agents such as food colouring agents, plasticisers such as glycerine or soy oil, antimicrobials such as potassium sorbate, nitrates, nitrites, propylene oxide and the like, antioxidants such as vitamin E, butylated hydroxyl anisole (BHA), butylated hydroxytoluene (BHT), and other antioxidants that may be present, or mixtures thereof. The skilled addressee will appreciate that the selection of such commonly included additives will be made depending on end purpose, and perceived need.
Seed compositions of the invention may be applied to oilseed plant seed at a rate of application from 0.1 g to 500 g, preferably from 1g to 100g, most preferably from 5g to 50g of the active ingredient (a.i.) per 100kg of seed.
Liquid formulations of the invention may be formulated as an aqueous formulation or as an oleaginous formulation, depending on design. Aqueous formulations may include surfactants selected from commercially available surfactants such as Tween 20, Silwet L77, Tween 80, Torpedo II, Newmans T80, Fortune, Guard, Rhino, Biopower, and the like.
8 Oleaginous formulations, that is to say oil-based formulations, may contain any oil suitable for use in the present invention which may be selected from petroleum oils, such as paraffin oil, and vegetable oils such as rapeseed oil, soybean oil, sunflower oil, palm oil and the like.
Oil formulations of use in the invention contain organic particles of the invention and as described herein and these in turn may be admixed with flow agents such as hydrophilic precipitated silicas, for example Sipernat 383 DS, Sipernat 320, EXP 4350, and Sipernat D-17 and the like. Such free-flowing agents may be dispersed in oils, for example, for anti-foaming purposes.
The skilled addressee will appreciate that where an aqueous or an oil formulation may be used, the liquid element should be removed from the coated oilseed plant seeds after coating is achieved, for example by drying off using conventional drying processes.
Coatings of organic materials of use in the present invention also serve to protect immediately planted oilseed plant seeds from soil borne pathogens, that is to say, pathogens that are able to colonise the seed cuticle and/or pathogens that populate the soil and which are capable of acting on oilseed plant seeds. Such soil borne pathogens are typically bacteria and/or fungi. Examples of soil borne bacterial and fungal pathogens that attack oilseed plants include Rhizoctonia spp. (active against e.g. rapeseed, canola;
R. solani active against B. napus and B. campestris), Peronospora spp. such as P.
parasitica (active against B. napus and B. campestris) Pythium spp, (active against e.g. canola and oilseed rape, sunflower), Fusarium spp. (active against sunflower) such as F.
oxysporum (active against e.g. canola and oilseed rape), Phytophthora spp. (active against e.g.
canola and oilseed rape e.g. P. megasperma), Vedic'Ilium spp. (active against sunflower) such as V.
Iongisporum (active against Brassica spp. such as B. napus and B. campestris), Sclerotium spp. (active against e.g. canola), Agrobacterium tumefaciens (active against sunflower and Brassica spp. e.g. canola), Phoma spp.(active against sunflower) such as Phoma lingam (active against Brassica spp.), Pseudomonas spp. (active against sunflower;
and canola e.g.
P. syringae pv maculicola), Altemaria spp. (active against canola, sunflower), and the like.
According to a further aspect of the invention there is provided use of an organic material in the form of particles wherein the organic material is selected from at least one wax having a melting point of ?.50 Centigrade in the manufacture of a coating composition for oil seeds.
The organic materials are selected from one or more organic materials having a melting point of .50 Centigrade, more preferably of ?..60 C and most preferably are made up of hard waxes having a melting point of .70 C. Suitable organic materials include those as described herein, such as carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax or a mixture of two or more thereof, and preferably, the seed coating that is used includes carnauba wax.
Oil formulations of use in the invention contain organic particles of the invention and as described herein and these in turn may be admixed with flow agents such as hydrophilic precipitated silicas, for example Sipernat 383 DS, Sipernat 320, EXP 4350, and Sipernat D-17 and the like. Such free-flowing agents may be dispersed in oils, for example, for anti-foaming purposes.
The skilled addressee will appreciate that where an aqueous or an oil formulation may be used, the liquid element should be removed from the coated oilseed plant seeds after coating is achieved, for example by drying off using conventional drying processes.
Coatings of organic materials of use in the present invention also serve to protect immediately planted oilseed plant seeds from soil borne pathogens, that is to say, pathogens that are able to colonise the seed cuticle and/or pathogens that populate the soil and which are capable of acting on oilseed plant seeds. Such soil borne pathogens are typically bacteria and/or fungi. Examples of soil borne bacterial and fungal pathogens that attack oilseed plants include Rhizoctonia spp. (active against e.g. rapeseed, canola;
R. solani active against B. napus and B. campestris), Peronospora spp. such as P.
parasitica (active against B. napus and B. campestris) Pythium spp, (active against e.g. canola and oilseed rape, sunflower), Fusarium spp. (active against sunflower) such as F.
oxysporum (active against e.g. canola and oilseed rape), Phytophthora spp. (active against e.g.
canola and oilseed rape e.g. P. megasperma), Vedic'Ilium spp. (active against sunflower) such as V.
Iongisporum (active against Brassica spp. such as B. napus and B. campestris), Sclerotium spp. (active against e.g. canola), Agrobacterium tumefaciens (active against sunflower and Brassica spp. e.g. canola), Phoma spp.(active against sunflower) such as Phoma lingam (active against Brassica spp.), Pseudomonas spp. (active against sunflower;
and canola e.g.
P. syringae pv maculicola), Altemaria spp. (active against canola, sunflower), and the like.
According to a further aspect of the invention there is provided use of an organic material in the form of particles wherein the organic material is selected from at least one wax having a melting point of ?.50 Centigrade in the manufacture of a coating composition for oil seeds.
The organic materials are selected from one or more organic materials having a melting point of .50 Centigrade, more preferably of ?..60 C and most preferably are made up of hard waxes having a melting point of .70 C. Suitable organic materials include those as described herein, such as carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax or a mixture of two or more thereof, and preferably, the seed coating that is used includes carnauba wax.
9 Preferably, in this aspect of the invention, the organic particles have a mean volume diameter selected from ?.10pm to 200pm, as herein described and as appropriate for the oilseed plant seeds to which the particles are to be applied. Naturally, the skilled addressee will appreciate that the size of the organic particles to be applied to oilseed plant seeds will depend on the size of the seed, and the type or form of such oilseed plant seeds that are contemplated for coating.
In a third aspect of the invention there is provided a method of manufacturing an oilseed coating composition as herein described that comprises 1) selecting solid organic material wherein the solid organic material is wax having a melting point of _50 C;
2) machining said organic material into particles of a volume mean diameter of ?_10pm; and 3) adding one or more additives for enhancing seedling vigour and/or seedling growth selected from one or more inorganic additives and/or one or more live biological agents.
The organic material in this aspect of the invention may be selected from organic materials such as from organic waxes having a melting point of ?_50 C, more preferably of ?..60 C, and most preferably are made up of hard waxes having a melting point of _70 C.
Suitable waxes for use in this aspect of the invention include carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax or a mixture of two or more thereof. Preferably, the selected organic material includes a substantial proportion of carnauba wax up to 100%, for example 1%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or more or any proportion therein between, the rest being made up of is at least one other organic material as herein defined. Preferably, the selected organic material is solely carnauba wax which may contain further additives as herein described, and further components such as UV blockers, antioxidants such as vitamin E and the like.
In a further aspect of the invention, there is provided an oilseed plant seed coating composition produced by the method as described herein.
In a further aspect of the invention there is provided a coating composition as described herein for use on oilseed plant seeds.
In a further aspect of the invention there is provided a method of coating oilseeds with a coating composition that comprises at least one organic material as herein defined wherein the organic material is selected from waxes having a melting point of 50 Centigrade, the method comprising i) obtaining organic material as a population of particles of a pre-determined VMD; and ii) applying the said population of particles to oilseeds.
The skilled addressee will appreciate that environmental factors that may affect oilseed plant seed viability includes such factors as extremes of heat, loss of moisture and the presence of pathogens such as bacteria and/or fungi. The skilled addressee will also appreciate that the pre-determined VMD will be appropriate to the size of the oilseed plant seeds, to which the coating is to be applied.
In a variant of this aspect of the invention there is provided a method of coating oilseeds with a coating composition that comprises an organic material wherein the organic material is selected from waxes having a melting point of 50 Centigrade, the method comprising i) obtaining said material;
ii) heating the organic material so as to form a liquid phase or a gaseous phase;
iii) cooling the liquid phase or gaseous phase of ii) to below the melting point of the organic material, forming a solid;
iv) adding one or more additives to the solid formed in iii);
v) machining the solid organic material of iii) into particles of a pre-determined VMD;
and vi) applying the particles of v) to oilseeds.
In a second variant of the above aspect of the invention there is provided a method of coating oilseeds with a coating composition of the invention that comprises an organic material wherein the organic material is selected from waxes having a melting point of .50 Centigrade, the method comprising i) obtaining said organic material;
ii) heating the organic material of i) so as to form a liquid phase or a gaseous phase;
iii) adding one or more additives to the liquid phase or gaseous phase of ii);
iv) cooling the liquid phase or gaseous phase of iii) to below the melting point of the organic material, forming a solid;
v) machining the solid organic material of iv) into particles of a pre-determined VMD as herein defined; and vi) applying the particles of v) to oilseeds.
The oilseeds are typically selected from oilseed plants as herein defined. The organic material of use in the invention may comprise one or more organic materials selected from organic materials as herein defined. Preferably, the organic material is carnauba wax. Where two or more organic materials of use in the invention are employed as the organic material in for example, an oilseed coating composition of the invention they may be heated together so as to form a liquid phase or a gaseous phase during which phases the organic material may be mixed, if required. Once the organic materials are mixed they may be cooled to below the melting point of the organic material possessing the lowest melting point in the liquid phase (where a gas phase is employed, this will be cooled to a liquid phase), forming a solid which may then be machined, such as by comminution, into particles of a pre-determined VMD as herein defined using conventional procedures. As described above, one or more additives may be added to the organic materials at points indicated above. It will be appreciated that the person skilled in the art will understand at what point or points in the described processes additives may be added to the organic material, depending on the additive material to be added to the organic material forming particles of use in the invention.
Once the organic material is in the form of particles of a known VMD, the particles may be applied to oilseed plant seeds using conventional means, such as by tumbling.
The treatment composition is applied to oilseed plant seeds, in dry particulate form or liquid form as hereinbefore described, and preferably in dry particulate form. The organic material in the above aspect and variant aspect of the invention may be selected from organic materials selected from organic waxes having a melting point of ?_50 C, more preferably of ?_60 C, and most preferably are made up of hard waxes having a melting point of _70 C.
Suitable waxes for use in the invention include those waxes as herein before described and include carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax or a mixture of two or more thereof. Preferably, the selected organic material includes a substantial proportion of carnauba wax up to 100%, for example 1%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or more or any proportion therein between, the rest being made up of at least one other organic material as herein defined. Preferably, the selected organic material is solely carnauba wax which may contain further added components as herein defined, such as UV
blockers, antioxidants such as vitamin E and the like.
Generally, the particles of use in the above aspect of the invention and the variant aspect of the invention possess a volume mean diameter as herein before described.
There now follow examples that illustrate the invention. It is to be understood that the examples are not to be construed as limiting the invention in any way.
Example: Growth and Vigour in B. napus.
Brassica napus seed provided by Herbiseeds (Twyford, UK) Combination of Carnauba wax particles and Inoculant Rock Phosphate Rock Phosphate (Garden Direct,UK) with a 30% P205 content is crushed using a pestle and mortar and then passed through a 32 micron mesh sieve.
Carnauba Wax Sizing Method Steps in Air Milling in Boyes Micronisation Process (for carnauba wax particles with a VMD
of approx. 75pm) , 1. 2kg camauba wax blocks are first kibbled into approximately 4 to 6mm pieces in a KT
Handling Ltd Model 04 kibbler (serial no. 729/C) following the manufacturer's instructions.
2. The kibbled pieces are then passed through an Apex Construction Ltd Model 314.2 Comminuting Mill (serial no. A21306) and reduced further in size to a range of 250 to 300um.
3. The comminuted particles are then passed through a Hosokawa Micron Ltd Alpine 100AFG jet mill (serial no. 168092) following the manufacturer's instructions, setting the mill at a speed of 2,500rpm with a positive system pressure of 0.03bar.
4. The grinding air is to be kept to 6 bar, the system rinsing air flow and Classifying Wheel gap rinsing air are both to be set at a minimum of 0.5 bar and no more than 0.75bar, the cleaning air filter is to register a delta of no more than 5bar to achieve a final particle size with a VMD of approx. 75um.
Rock phosphate is combined with Carnauba wax particles (VMD 75pm) at a ratio of 1:3 (Rock Phosphate:Carnauba wax particles). A homogeneous mix is attained through tumbling seed and camauba wax formulation in a cylinder, adapted to produce lateral mixing/tumbling through the inclusion of angled interior vanes, placed on a Wheaton roller for 5 minutes.
Dry Powder Formulation of Mycorrhizae International Culture Collection of VA
Mycorrhizal Fungi (INVAM).
Mycorrhizae concentration is measured by diluting 1gm in 11 of water, before further diluting by taking 1 ml of the suspension and making it up to 1000m1. A 20p1 sample is then added to an Improved Neubauer Counting Slide and a count made of 4 large squares (0.1mrnA3) in both of the grids. The mean for each square is calculated and the mean of the two grids used to produce a measurement of spores per 100n1 of water. The dilution factor is then applied to produce an approximation of the number of spores per gram.
Carnauba wax particles are produced following the above descrobed procedure with the exception that the milling speed was set at 8000rpm to obtain wax particles having a VMD of of 16pm. The particles are combined with Mycorrhizae at a ratio of 1:3 (Mycorrhizae:Carnauba wax particles) in a 50mItube using a Stuart roller mixer set at 25rpm for 5 minutes. This can then be used to calculate the quantity of spore/Carnauba wax particles powder mix required for the seed coating based on a standard of 1x104 spores gram-1 of seed.
A homogeneous mix of is attained through tumbling seed and carnauba wax formulation in a cylinder, adapted to produce lateral mixing/tumbling through the inclusion of angled interior vanes, placed on a Wheaton roller for 5 minutes.
=
I Chitosan Chitosan (>75% Deacetylated chitin, Poly(D-glucosamine)) (Sigma Aldrich,UK) is crushed using a pestle and mortar and then passed through a 32 micron mesh sieve.
Chitosan is combined with Carnauba wax particles obtained using the protocol described above with the exception that the milling speed was set at 2,500 rpm to obtain particles having a VMD of approx. 75pm at a ratio of 1:19 (Chitosan:Carnauba wax particles). A
homogeneous mix of is attained through tumbling seed and carnauba wax formulation in a cylinder, adapted to produce lateral mixing/tumbling through the inclusion of angled interior vanes, placed on a Wheaton roller for 5 minutes.
Treatments:
1. Carnauba wax particles and Mycorrhizae 2. Carnauba wax particles and Rock Phosphate 3. Carnauba wax particles and Chitosan 4. Mycorrhizae control 5. Rock Phosphate control 6. Chitosan control 7. Carnauba wax particle control (vehicle control) 8. Untreated Control Seeds are planted in two 84 well plug trays using moist seed potting compost (John Innes No.2). The trays are placed in a Vitopod propagator (Greenhouse Sensations, UK) at 20 C.
Moisture content (Brannan Soil Moisture Meter, Fisher Scientific, UK) and pH
levels (Brannan Soil pH meter, Fisher Scientific, UK) are checked to ensure that the conditions are consistent across the tray. The order of the treatments is randomised (by row units) to reduce any unforeseen bias.
At the true leaf stage the plants are carefully transplanted from the plugs to 7cm square pots filled with a sterilised top soil. The macro-nutrient (nitrates, phosphates and potassium) content of the top soil is measured using a La Motte Model STH-4 soil testing kit and recorded. Six replicates for each treatment (48 plants) are randomly assigned to each of three propagators, and further randomised within the propagator (total = 144 plants). The propagators are set at 15 C, 20 C and 25 C. Light is provided on a 16:8 Light:Dark cycle using a twin bulb T5 lighting array suspended 150mm above the propagator (Lightwave T5, 48w, 3300 lumens). T5 tubes (6500 Kelvin) deliver the bright blue/white light required by the plant for growth without emitting much heat which may scorch tender seedlings Moisture content and pH levels are checked to ensure that the conditions are consistent across the propagator by measuring six random plants along a pathway (alternating between a W and Z). This is repeated for each propagator.
Plants are watered as required based on conditions to maintain consistent soil moisture content of 18% throughout all plants.
The lids of the propagators are removed at such time as required due to the plant height.
After 21 days the plants are removed from the propagators and the following measurements recorded:
Root weight (fresh) Shoot weight (fresh) % Mycorrhyzal root colonisation (by microscopic examination) Plant tissue is measured for macro-nutrient content using the instructions provided with a La Motte Model PT-3R Plant Tissue Test kit.
Analysis The percentage data (root colonisation data) were arcsine transformed. The influence of the factors and their interactions are tested with a two-way analysis of variance.
Where the ANOVA reveals significant effects by the factors, the differences between treatments are separated using a post hoc least significant difference (LSD), multiple comparison test (p 5 0.05).
The influence of the factors and their interactions are tested with a 2-way ANOVA. The analysis was done for each temperature separately and with temperature as a factor. For the ANOVA with temperature as a factor, treatments were used as a sub-plot factor.
Fisher's Least Significance Differences were calculated at the 5% significance level to compare treatment means. Shapiro-Wilks's test was performed to test for non-normality The above procedures are followed to apply: rock phosphate, chitosan and Glomus sp. on seeds of canola (Brassica campestris).
The above procedures are followed to apply: rock phosphate, chitosan and Glomus sp. on seeds of Sunflower (Helianthus annuus).
Delivery of Macronutrients using Carnauba wax particles as a seed coating on Oilseed Rape IAim: to assess the potential for formulating essential macronutrients into carnauba wax particles and using this as a seed coating to provide the germinating seed and seedling with supplementary nutrients to aid in early stage growth.
Macronutrients selected:
Phosphorus (P) = Phosphorus (P) is an essential part of the process of photosynthesis.
= Involved in the formation of all oils, sugars, starches, etc.
= Helps with the transformation of solar energy into chemical energy;
proper plant maturation; withstanding stress.
= Effects rapid growth.
= Encourages blooming and root growth.
Potassium (K) = Potassium is absorbed by plants in larger amounts than any other mineral element except nitrogen and, in some cases, calcium.
= Helps in the building of protein, photosynthesis, fruit quality and reduction of diseases.
= Potassium is supplied to plants by soil minerals, organic materials, and fertilizer.
Both Potassium and Phosphorus can be found in soluble form in Monobasic Potassium Phosphate or MKP(KH2PO4), a soluble salt commonly used as a fertiliser and plant growth supplement.
Formulation Method Carnauba is heated on a hotplate at 100 C to a molten state. Monopotassium phosphate (MKP) is dissolved in deionised water to the required concentration. The MKP
solution is slowly added to the molten wax under stirring at 1500rpm. Stirring continues for 5 minutes before the water/wax emulsion is poured onto a metal sheet to cool. The resulting solid wax including micro-droplets of MKP is then micronized in an air mill following the procedure described above with the exception that the milling speed was set at 12,500rpm in order to obtain particles having a VMD or approx. 10.3pm.
Experimental Method Wax particles containing 10% MKP are added to 10g of oilseed rape seed, cv.
Sesame (LS
Plant Breeding, UK), at loadings of 0.1% and 1% by mass. Seed is well mixed to ensure a homogenous distribution across the seed. A third batch of seed is combined with unformulated carnauba wax particles as a control.
seeds for each treatment are sown in 20 cell modular seed trays with an individual cell size: Length 37mm x Width 37mm x Depth 65mm, with each tray representing a single sample. Each treatment is replicated four times.
The pots are filled with a sieved, heat-sterilised seed mix (Levingtons F1 Seed and Modular Compost ¨ Low Nutrient)) to level with the top of the cell. Low Conductivity:
250-280 pS, Standard pH: 5.3-5.7, Mg/litre added: N ¨ 100, P ¨ 200, K ¨ 200.
They are then lightly tamped and 30m1 of deionised water added to each cell through a course filter. A single seed is then placed on the surface of the soil and covered with a thin layer of vermiculite to a depth of 2-3x the diameter of the seed, as per supplier recommendation. The trays are placed within plastic gravel trays (two per tray) which are lined with capillary matting to aid watering.
The gravel trays are then placed in a thermostatically controlled plant growth chamber (Fitotron SGC120, Weiss Gallenkamp, Loughborough, UK). Temperature cycling is set at C/10 C on a 16/8hr schedule. Lighting at 150 pmol m-2 s-1 on a 16/8hr photoperiod is introduced at first emergence.
Plants are watered daily from the bottom in order to maintain a compost moisture level of approximately 40% in the cells After 10 days the plants are removed from the individual cells and the compost mix separated from the root structure. Plants from each 10 cell tray are combined and separated into shoots, made up of the first true leaves and growing tip, and roots.
PLANT TISSUE ANALYSIS: (conducted to the following method by NRM Laboratories (Bracknell, UK) Total Phosphorus (P), Potassium (K), Magnesium (Mg), Calcium (Ca), Sodium (Na), Manganese (Mn), Copper (Cu), Iron (Fe), Zinc (Zn), Boron (B) determination using Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) method EQUIPMENT
1. ICP Emission Spectrograph 2. Autosampler 3. Digital Dilutor REAGENTS
1. 3N Hydrochloric Acid: Dilute 250 ml. of concentrated hydrochloric acid to 1 litre using deionized water and mix well.
2. Nitric Acid: HNO3 STANDARDS
1. Stock Solutions: Use 1000 PPM certified, NIST traceable, plasma grade standards for the 16 listed elements.
2. Instrument Calibration Standards:
a. WAT 1 - deionized water b. WAT 2 - Mn, Fe, Al, B, Cu, Zn, Na, Pb, Cd, Ni, Cr, Mo - Pipet 10 ml. of stock solution of each element into a 1 litre volumetric flask. Add 5 ml. of nitric acid.
Dilute to volume with deionized water and mix well.
c. PLN2 - P, K, Ca, Mg - Pipet the designated ml. of stock solution into a 1 litre volumetric flask. Add 5 ml. of nitric acid. Dilute to volume with deionized water and mix well.
Final Stock Solution Concentration Instrument Element ml. forEJ:_-). Readout %
_ P 10 10 1.00 K 50 50 5.00 Ca 20 20 2.00 Mg 10 10 1.00 3. Instrument Calibration Verification Standards:
a. A second set of calibration standards obtained from a different manufacturer.
SAMPLE PREPARATION
Samples are dried and ground to pass through a 1mm screen.
The elements in the residue remaining after the destruction of the organic matter by ashing at 550 C are dissolved in hydrochloric acid:
1. Dry Ash a. Weigh 1g sample into a 10 ml. glazed, high-form porcelain crucible.
b. Ash in a muffle furnace for 4 hours at 500 C.
c. Let cool and add 5 ml. of 3N HCI.
d. Place on a hot plate and boil gently for 5 minutes.
e. Let cool and transfer to a 100 ml. volumetric flask. Dilute to volume with deionized water and mix well. Use this solution for the analysis of Mn, Fe, Al, B, Cu, Zn, Na, Pb, Cd, Ni, Cr and Mo.
f. Dilute the solution obtained in le. one to ten with deionized water using a digital dilutor. Use this solution for the analysis of P, K, Ca and Mg.
ICP PROCEDURE
1. Set up and operate the ICP Emission Spectrograph in accordance with manufacturer's specifications.
2. Mn, Fe, B, Cu, Zn, Na, Ni analysis.
a. Choose PLANT from the method menu.
b. Calibrate the instrument using WAT1 and WAT2 instrument calibration standards.
c. Analyze the sample digests obtained in le. of the sample preparation section.
3. P, K, Ca, Mg analysis.
a. Choose PLANTDIL from the method menu.
b. Calibrate the instrument using WAT1 and PLN2 instrument calibration standards.
c. Analyze the digests obtained in 1f. of the sample preparation section.
QUALITY CONTROL
1. Following calibration, analyze one high instrument calibration standard, one instrument calibration verification standard and one quality control sample.
a. Instrument Calibration Standard: Values must be within 3% of the known value for K and Mo. All other elements must be within 2% of the known value.
b. Instrument Calibration Verification Standard: Values must be within 10% of the certified values.
c. Quality Control Sample: Values for all elements must be within limits established by the Extension chemist.
2. Analyze a high instrument calibration standard after each tenth sample and at the end of the set of samples.
a. Values must be within 8% of the known values.
b. If any of the values are greater than 8% from the known values, recalibrate the instrument and begin sample analysis from the last "good" instrument calibration standard.
3. Prepare one duplicate sample for each 10 samples. If the set contains less than 10 samples, prepare one duplicate per set.
a. Results on the duplicate sample should agree within 20% of the average value of the two samples.
REFERENCES
1. Isaac, R.A. and W.C. Johnson, 1985, Elemental Analysis of Plant Tissue by Plasma Emission Spectroscopy: Collaborative Study. JAOAC. 68(3), pp 499- 505.
2. AOAC Official Method 985.01, in Official Methods of Analysis of AOAC
International, 16th edition, Volume I Chapter 3, p. 4.
3. AOAC Official Method 968.08 D(a), in Official Methods of Analysis of AOAC
International, 16th edition, Volume I Chapter 4, p. 23.
Phosphate Solubilisation using Beneficial Microbes Several bacterial species are able to impart a beneficial effect upon plant growth. Mostly they are associated with the plant rhizosphere, so they are called as rhizobacteria. This group of bacteria has been termed plant growth promoting rhizobacteria, and among them are strains from genera such as Alcaligenes, Acinetobacter, Arthrobacter, Azospirillum, Bacillus, Burkholderia, Enterobacter, Erwinia, Flavobacterium, Paenibacillus, Pseudomonas, Rhizobium, and Serratia.
The production of organic acids by phosphate solubilizing bacteria has been well documented and identified as the main mechanism for phosphate solubilisation.
Gluconic acid seems to be the most frequent agent of phosphate solubilisation (Pseudomonas sp.), and 2-ketogluconic acid is also identified in strains with phosphate solubilizing ability (Rhizobium sp.).
Saprophytic fungi are also known to solubilise both organic and inorganic phosphates.
Several genus, including Trichoderma, Penicillium, and Gliocladium have exhibited potential as biofertilisers. Morales et al (2011) demonstrated that Penicillium albidum was able to solubilise 64mg of organic/inorganic phosphate per gram of fungi.
Experiment to assess the potential for delivery of Phosphate Solubilising Organisms as a seed costing using Carnauba wax particles Using a dry spore powder of a phosphate solubilising organism, such as Penicillium bilaii.
Spores are combined with carnauba wax particles with a VMD of approximately 10pm at a ratio of 1:3. The powders are agitated to create a homogenous mix and applied to sterilised Oilseed rape seed at a loading of 0.1% (by mass). Additional batches of seed are treated with spores only (0.1%), Entostat only (0.1%) and untreated seed.
Phosphate Solubilising Activity Screening Plate screening using Pikovskays' medium (see below) is used to demonstrate phosphate solubilising activity of the treated seed. 9cm petri dishes are divided into quadrants and a seed is placed in the centre of each quadrant. Plates are incubated at 20 C
for 4 days.
Active phosphate solubilising agents produce clear zones around the seed as they solubilise the insoluble mineral phosphates within the media. The radius of the clear zones is measured and compared to the mean results achieved for each treatment.
Differences are analysed using one-way ANOVA and Tukey Post-Hoc diagnostic test where significance is found.
Phosphate uptake by plant Seeds are treated as described above.
Sure to Grow PET grow cubes (25x25x38mm) are soaked in deionised water containing 1%
Ca3(PO4)2 in suspension until saturated. Cubes are placed in free draining plant trays on a level surface to prevent nutrient run-off and migration whilst taking care to avoid pooling of water at the root zone. 10 cubes are used per tray and the mean of these represents one replicate. Each treatment is replicated 8 times.
A single Oilseed rape seed is placed in the cross-cut X in the top of each cube. Seed trays are then covered to maintain a humid environment and regularly top watered with the 1%
Ca3(PO4)2 suspension to maintain a moist cube. Trays are incubated at 20 C and
In a third aspect of the invention there is provided a method of manufacturing an oilseed coating composition as herein described that comprises 1) selecting solid organic material wherein the solid organic material is wax having a melting point of _50 C;
2) machining said organic material into particles of a volume mean diameter of ?_10pm; and 3) adding one or more additives for enhancing seedling vigour and/or seedling growth selected from one or more inorganic additives and/or one or more live biological agents.
The organic material in this aspect of the invention may be selected from organic materials such as from organic waxes having a melting point of ?_50 C, more preferably of ?..60 C, and most preferably are made up of hard waxes having a melting point of _70 C.
Suitable waxes for use in this aspect of the invention include carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax or a mixture of two or more thereof. Preferably, the selected organic material includes a substantial proportion of carnauba wax up to 100%, for example 1%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or more or any proportion therein between, the rest being made up of is at least one other organic material as herein defined. Preferably, the selected organic material is solely carnauba wax which may contain further additives as herein described, and further components such as UV blockers, antioxidants such as vitamin E and the like.
In a further aspect of the invention, there is provided an oilseed plant seed coating composition produced by the method as described herein.
In a further aspect of the invention there is provided a coating composition as described herein for use on oilseed plant seeds.
In a further aspect of the invention there is provided a method of coating oilseeds with a coating composition that comprises at least one organic material as herein defined wherein the organic material is selected from waxes having a melting point of 50 Centigrade, the method comprising i) obtaining organic material as a population of particles of a pre-determined VMD; and ii) applying the said population of particles to oilseeds.
The skilled addressee will appreciate that environmental factors that may affect oilseed plant seed viability includes such factors as extremes of heat, loss of moisture and the presence of pathogens such as bacteria and/or fungi. The skilled addressee will also appreciate that the pre-determined VMD will be appropriate to the size of the oilseed plant seeds, to which the coating is to be applied.
In a variant of this aspect of the invention there is provided a method of coating oilseeds with a coating composition that comprises an organic material wherein the organic material is selected from waxes having a melting point of 50 Centigrade, the method comprising i) obtaining said material;
ii) heating the organic material so as to form a liquid phase or a gaseous phase;
iii) cooling the liquid phase or gaseous phase of ii) to below the melting point of the organic material, forming a solid;
iv) adding one or more additives to the solid formed in iii);
v) machining the solid organic material of iii) into particles of a pre-determined VMD;
and vi) applying the particles of v) to oilseeds.
In a second variant of the above aspect of the invention there is provided a method of coating oilseeds with a coating composition of the invention that comprises an organic material wherein the organic material is selected from waxes having a melting point of .50 Centigrade, the method comprising i) obtaining said organic material;
ii) heating the organic material of i) so as to form a liquid phase or a gaseous phase;
iii) adding one or more additives to the liquid phase or gaseous phase of ii);
iv) cooling the liquid phase or gaseous phase of iii) to below the melting point of the organic material, forming a solid;
v) machining the solid organic material of iv) into particles of a pre-determined VMD as herein defined; and vi) applying the particles of v) to oilseeds.
The oilseeds are typically selected from oilseed plants as herein defined. The organic material of use in the invention may comprise one or more organic materials selected from organic materials as herein defined. Preferably, the organic material is carnauba wax. Where two or more organic materials of use in the invention are employed as the organic material in for example, an oilseed coating composition of the invention they may be heated together so as to form a liquid phase or a gaseous phase during which phases the organic material may be mixed, if required. Once the organic materials are mixed they may be cooled to below the melting point of the organic material possessing the lowest melting point in the liquid phase (where a gas phase is employed, this will be cooled to a liquid phase), forming a solid which may then be machined, such as by comminution, into particles of a pre-determined VMD as herein defined using conventional procedures. As described above, one or more additives may be added to the organic materials at points indicated above. It will be appreciated that the person skilled in the art will understand at what point or points in the described processes additives may be added to the organic material, depending on the additive material to be added to the organic material forming particles of use in the invention.
Once the organic material is in the form of particles of a known VMD, the particles may be applied to oilseed plant seeds using conventional means, such as by tumbling.
The treatment composition is applied to oilseed plant seeds, in dry particulate form or liquid form as hereinbefore described, and preferably in dry particulate form. The organic material in the above aspect and variant aspect of the invention may be selected from organic materials selected from organic waxes having a melting point of ?_50 C, more preferably of ?_60 C, and most preferably are made up of hard waxes having a melting point of _70 C.
Suitable waxes for use in the invention include those waxes as herein before described and include carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax or a mixture of two or more thereof. Preferably, the selected organic material includes a substantial proportion of carnauba wax up to 100%, for example 1%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or more or any proportion therein between, the rest being made up of at least one other organic material as herein defined. Preferably, the selected organic material is solely carnauba wax which may contain further added components as herein defined, such as UV
blockers, antioxidants such as vitamin E and the like.
Generally, the particles of use in the above aspect of the invention and the variant aspect of the invention possess a volume mean diameter as herein before described.
There now follow examples that illustrate the invention. It is to be understood that the examples are not to be construed as limiting the invention in any way.
Example: Growth and Vigour in B. napus.
Brassica napus seed provided by Herbiseeds (Twyford, UK) Combination of Carnauba wax particles and Inoculant Rock Phosphate Rock Phosphate (Garden Direct,UK) with a 30% P205 content is crushed using a pestle and mortar and then passed through a 32 micron mesh sieve.
Carnauba Wax Sizing Method Steps in Air Milling in Boyes Micronisation Process (for carnauba wax particles with a VMD
of approx. 75pm) , 1. 2kg camauba wax blocks are first kibbled into approximately 4 to 6mm pieces in a KT
Handling Ltd Model 04 kibbler (serial no. 729/C) following the manufacturer's instructions.
2. The kibbled pieces are then passed through an Apex Construction Ltd Model 314.2 Comminuting Mill (serial no. A21306) and reduced further in size to a range of 250 to 300um.
3. The comminuted particles are then passed through a Hosokawa Micron Ltd Alpine 100AFG jet mill (serial no. 168092) following the manufacturer's instructions, setting the mill at a speed of 2,500rpm with a positive system pressure of 0.03bar.
4. The grinding air is to be kept to 6 bar, the system rinsing air flow and Classifying Wheel gap rinsing air are both to be set at a minimum of 0.5 bar and no more than 0.75bar, the cleaning air filter is to register a delta of no more than 5bar to achieve a final particle size with a VMD of approx. 75um.
Rock phosphate is combined with Carnauba wax particles (VMD 75pm) at a ratio of 1:3 (Rock Phosphate:Carnauba wax particles). A homogeneous mix is attained through tumbling seed and camauba wax formulation in a cylinder, adapted to produce lateral mixing/tumbling through the inclusion of angled interior vanes, placed on a Wheaton roller for 5 minutes.
Dry Powder Formulation of Mycorrhizae International Culture Collection of VA
Mycorrhizal Fungi (INVAM).
Mycorrhizae concentration is measured by diluting 1gm in 11 of water, before further diluting by taking 1 ml of the suspension and making it up to 1000m1. A 20p1 sample is then added to an Improved Neubauer Counting Slide and a count made of 4 large squares (0.1mrnA3) in both of the grids. The mean for each square is calculated and the mean of the two grids used to produce a measurement of spores per 100n1 of water. The dilution factor is then applied to produce an approximation of the number of spores per gram.
Carnauba wax particles are produced following the above descrobed procedure with the exception that the milling speed was set at 8000rpm to obtain wax particles having a VMD of of 16pm. The particles are combined with Mycorrhizae at a ratio of 1:3 (Mycorrhizae:Carnauba wax particles) in a 50mItube using a Stuart roller mixer set at 25rpm for 5 minutes. This can then be used to calculate the quantity of spore/Carnauba wax particles powder mix required for the seed coating based on a standard of 1x104 spores gram-1 of seed.
A homogeneous mix of is attained through tumbling seed and carnauba wax formulation in a cylinder, adapted to produce lateral mixing/tumbling through the inclusion of angled interior vanes, placed on a Wheaton roller for 5 minutes.
=
I Chitosan Chitosan (>75% Deacetylated chitin, Poly(D-glucosamine)) (Sigma Aldrich,UK) is crushed using a pestle and mortar and then passed through a 32 micron mesh sieve.
Chitosan is combined with Carnauba wax particles obtained using the protocol described above with the exception that the milling speed was set at 2,500 rpm to obtain particles having a VMD of approx. 75pm at a ratio of 1:19 (Chitosan:Carnauba wax particles). A
homogeneous mix of is attained through tumbling seed and carnauba wax formulation in a cylinder, adapted to produce lateral mixing/tumbling through the inclusion of angled interior vanes, placed on a Wheaton roller for 5 minutes.
Treatments:
1. Carnauba wax particles and Mycorrhizae 2. Carnauba wax particles and Rock Phosphate 3. Carnauba wax particles and Chitosan 4. Mycorrhizae control 5. Rock Phosphate control 6. Chitosan control 7. Carnauba wax particle control (vehicle control) 8. Untreated Control Seeds are planted in two 84 well plug trays using moist seed potting compost (John Innes No.2). The trays are placed in a Vitopod propagator (Greenhouse Sensations, UK) at 20 C.
Moisture content (Brannan Soil Moisture Meter, Fisher Scientific, UK) and pH
levels (Brannan Soil pH meter, Fisher Scientific, UK) are checked to ensure that the conditions are consistent across the tray. The order of the treatments is randomised (by row units) to reduce any unforeseen bias.
At the true leaf stage the plants are carefully transplanted from the plugs to 7cm square pots filled with a sterilised top soil. The macro-nutrient (nitrates, phosphates and potassium) content of the top soil is measured using a La Motte Model STH-4 soil testing kit and recorded. Six replicates for each treatment (48 plants) are randomly assigned to each of three propagators, and further randomised within the propagator (total = 144 plants). The propagators are set at 15 C, 20 C and 25 C. Light is provided on a 16:8 Light:Dark cycle using a twin bulb T5 lighting array suspended 150mm above the propagator (Lightwave T5, 48w, 3300 lumens). T5 tubes (6500 Kelvin) deliver the bright blue/white light required by the plant for growth without emitting much heat which may scorch tender seedlings Moisture content and pH levels are checked to ensure that the conditions are consistent across the propagator by measuring six random plants along a pathway (alternating between a W and Z). This is repeated for each propagator.
Plants are watered as required based on conditions to maintain consistent soil moisture content of 18% throughout all plants.
The lids of the propagators are removed at such time as required due to the plant height.
After 21 days the plants are removed from the propagators and the following measurements recorded:
Root weight (fresh) Shoot weight (fresh) % Mycorrhyzal root colonisation (by microscopic examination) Plant tissue is measured for macro-nutrient content using the instructions provided with a La Motte Model PT-3R Plant Tissue Test kit.
Analysis The percentage data (root colonisation data) were arcsine transformed. The influence of the factors and their interactions are tested with a two-way analysis of variance.
Where the ANOVA reveals significant effects by the factors, the differences between treatments are separated using a post hoc least significant difference (LSD), multiple comparison test (p 5 0.05).
The influence of the factors and their interactions are tested with a 2-way ANOVA. The analysis was done for each temperature separately and with temperature as a factor. For the ANOVA with temperature as a factor, treatments were used as a sub-plot factor.
Fisher's Least Significance Differences were calculated at the 5% significance level to compare treatment means. Shapiro-Wilks's test was performed to test for non-normality The above procedures are followed to apply: rock phosphate, chitosan and Glomus sp. on seeds of canola (Brassica campestris).
The above procedures are followed to apply: rock phosphate, chitosan and Glomus sp. on seeds of Sunflower (Helianthus annuus).
Delivery of Macronutrients using Carnauba wax particles as a seed coating on Oilseed Rape IAim: to assess the potential for formulating essential macronutrients into carnauba wax particles and using this as a seed coating to provide the germinating seed and seedling with supplementary nutrients to aid in early stage growth.
Macronutrients selected:
Phosphorus (P) = Phosphorus (P) is an essential part of the process of photosynthesis.
= Involved in the formation of all oils, sugars, starches, etc.
= Helps with the transformation of solar energy into chemical energy;
proper plant maturation; withstanding stress.
= Effects rapid growth.
= Encourages blooming and root growth.
Potassium (K) = Potassium is absorbed by plants in larger amounts than any other mineral element except nitrogen and, in some cases, calcium.
= Helps in the building of protein, photosynthesis, fruit quality and reduction of diseases.
= Potassium is supplied to plants by soil minerals, organic materials, and fertilizer.
Both Potassium and Phosphorus can be found in soluble form in Monobasic Potassium Phosphate or MKP(KH2PO4), a soluble salt commonly used as a fertiliser and plant growth supplement.
Formulation Method Carnauba is heated on a hotplate at 100 C to a molten state. Monopotassium phosphate (MKP) is dissolved in deionised water to the required concentration. The MKP
solution is slowly added to the molten wax under stirring at 1500rpm. Stirring continues for 5 minutes before the water/wax emulsion is poured onto a metal sheet to cool. The resulting solid wax including micro-droplets of MKP is then micronized in an air mill following the procedure described above with the exception that the milling speed was set at 12,500rpm in order to obtain particles having a VMD or approx. 10.3pm.
Experimental Method Wax particles containing 10% MKP are added to 10g of oilseed rape seed, cv.
Sesame (LS
Plant Breeding, UK), at loadings of 0.1% and 1% by mass. Seed is well mixed to ensure a homogenous distribution across the seed. A third batch of seed is combined with unformulated carnauba wax particles as a control.
seeds for each treatment are sown in 20 cell modular seed trays with an individual cell size: Length 37mm x Width 37mm x Depth 65mm, with each tray representing a single sample. Each treatment is replicated four times.
The pots are filled with a sieved, heat-sterilised seed mix (Levingtons F1 Seed and Modular Compost ¨ Low Nutrient)) to level with the top of the cell. Low Conductivity:
250-280 pS, Standard pH: 5.3-5.7, Mg/litre added: N ¨ 100, P ¨ 200, K ¨ 200.
They are then lightly tamped and 30m1 of deionised water added to each cell through a course filter. A single seed is then placed on the surface of the soil and covered with a thin layer of vermiculite to a depth of 2-3x the diameter of the seed, as per supplier recommendation. The trays are placed within plastic gravel trays (two per tray) which are lined with capillary matting to aid watering.
The gravel trays are then placed in a thermostatically controlled plant growth chamber (Fitotron SGC120, Weiss Gallenkamp, Loughborough, UK). Temperature cycling is set at C/10 C on a 16/8hr schedule. Lighting at 150 pmol m-2 s-1 on a 16/8hr photoperiod is introduced at first emergence.
Plants are watered daily from the bottom in order to maintain a compost moisture level of approximately 40% in the cells After 10 days the plants are removed from the individual cells and the compost mix separated from the root structure. Plants from each 10 cell tray are combined and separated into shoots, made up of the first true leaves and growing tip, and roots.
PLANT TISSUE ANALYSIS: (conducted to the following method by NRM Laboratories (Bracknell, UK) Total Phosphorus (P), Potassium (K), Magnesium (Mg), Calcium (Ca), Sodium (Na), Manganese (Mn), Copper (Cu), Iron (Fe), Zinc (Zn), Boron (B) determination using Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) method EQUIPMENT
1. ICP Emission Spectrograph 2. Autosampler 3. Digital Dilutor REAGENTS
1. 3N Hydrochloric Acid: Dilute 250 ml. of concentrated hydrochloric acid to 1 litre using deionized water and mix well.
2. Nitric Acid: HNO3 STANDARDS
1. Stock Solutions: Use 1000 PPM certified, NIST traceable, plasma grade standards for the 16 listed elements.
2. Instrument Calibration Standards:
a. WAT 1 - deionized water b. WAT 2 - Mn, Fe, Al, B, Cu, Zn, Na, Pb, Cd, Ni, Cr, Mo - Pipet 10 ml. of stock solution of each element into a 1 litre volumetric flask. Add 5 ml. of nitric acid.
Dilute to volume with deionized water and mix well.
c. PLN2 - P, K, Ca, Mg - Pipet the designated ml. of stock solution into a 1 litre volumetric flask. Add 5 ml. of nitric acid. Dilute to volume with deionized water and mix well.
Final Stock Solution Concentration Instrument Element ml. forEJ:_-). Readout %
_ P 10 10 1.00 K 50 50 5.00 Ca 20 20 2.00 Mg 10 10 1.00 3. Instrument Calibration Verification Standards:
a. A second set of calibration standards obtained from a different manufacturer.
SAMPLE PREPARATION
Samples are dried and ground to pass through a 1mm screen.
The elements in the residue remaining after the destruction of the organic matter by ashing at 550 C are dissolved in hydrochloric acid:
1. Dry Ash a. Weigh 1g sample into a 10 ml. glazed, high-form porcelain crucible.
b. Ash in a muffle furnace for 4 hours at 500 C.
c. Let cool and add 5 ml. of 3N HCI.
d. Place on a hot plate and boil gently for 5 minutes.
e. Let cool and transfer to a 100 ml. volumetric flask. Dilute to volume with deionized water and mix well. Use this solution for the analysis of Mn, Fe, Al, B, Cu, Zn, Na, Pb, Cd, Ni, Cr and Mo.
f. Dilute the solution obtained in le. one to ten with deionized water using a digital dilutor. Use this solution for the analysis of P, K, Ca and Mg.
ICP PROCEDURE
1. Set up and operate the ICP Emission Spectrograph in accordance with manufacturer's specifications.
2. Mn, Fe, B, Cu, Zn, Na, Ni analysis.
a. Choose PLANT from the method menu.
b. Calibrate the instrument using WAT1 and WAT2 instrument calibration standards.
c. Analyze the sample digests obtained in le. of the sample preparation section.
3. P, K, Ca, Mg analysis.
a. Choose PLANTDIL from the method menu.
b. Calibrate the instrument using WAT1 and PLN2 instrument calibration standards.
c. Analyze the digests obtained in 1f. of the sample preparation section.
QUALITY CONTROL
1. Following calibration, analyze one high instrument calibration standard, one instrument calibration verification standard and one quality control sample.
a. Instrument Calibration Standard: Values must be within 3% of the known value for K and Mo. All other elements must be within 2% of the known value.
b. Instrument Calibration Verification Standard: Values must be within 10% of the certified values.
c. Quality Control Sample: Values for all elements must be within limits established by the Extension chemist.
2. Analyze a high instrument calibration standard after each tenth sample and at the end of the set of samples.
a. Values must be within 8% of the known values.
b. If any of the values are greater than 8% from the known values, recalibrate the instrument and begin sample analysis from the last "good" instrument calibration standard.
3. Prepare one duplicate sample for each 10 samples. If the set contains less than 10 samples, prepare one duplicate per set.
a. Results on the duplicate sample should agree within 20% of the average value of the two samples.
REFERENCES
1. Isaac, R.A. and W.C. Johnson, 1985, Elemental Analysis of Plant Tissue by Plasma Emission Spectroscopy: Collaborative Study. JAOAC. 68(3), pp 499- 505.
2. AOAC Official Method 985.01, in Official Methods of Analysis of AOAC
International, 16th edition, Volume I Chapter 3, p. 4.
3. AOAC Official Method 968.08 D(a), in Official Methods of Analysis of AOAC
International, 16th edition, Volume I Chapter 4, p. 23.
Phosphate Solubilisation using Beneficial Microbes Several bacterial species are able to impart a beneficial effect upon plant growth. Mostly they are associated with the plant rhizosphere, so they are called as rhizobacteria. This group of bacteria has been termed plant growth promoting rhizobacteria, and among them are strains from genera such as Alcaligenes, Acinetobacter, Arthrobacter, Azospirillum, Bacillus, Burkholderia, Enterobacter, Erwinia, Flavobacterium, Paenibacillus, Pseudomonas, Rhizobium, and Serratia.
The production of organic acids by phosphate solubilizing bacteria has been well documented and identified as the main mechanism for phosphate solubilisation.
Gluconic acid seems to be the most frequent agent of phosphate solubilisation (Pseudomonas sp.), and 2-ketogluconic acid is also identified in strains with phosphate solubilizing ability (Rhizobium sp.).
Saprophytic fungi are also known to solubilise both organic and inorganic phosphates.
Several genus, including Trichoderma, Penicillium, and Gliocladium have exhibited potential as biofertilisers. Morales et al (2011) demonstrated that Penicillium albidum was able to solubilise 64mg of organic/inorganic phosphate per gram of fungi.
Experiment to assess the potential for delivery of Phosphate Solubilising Organisms as a seed costing using Carnauba wax particles Using a dry spore powder of a phosphate solubilising organism, such as Penicillium bilaii.
Spores are combined with carnauba wax particles with a VMD of approximately 10pm at a ratio of 1:3. The powders are agitated to create a homogenous mix and applied to sterilised Oilseed rape seed at a loading of 0.1% (by mass). Additional batches of seed are treated with spores only (0.1%), Entostat only (0.1%) and untreated seed.
Phosphate Solubilising Activity Screening Plate screening using Pikovskays' medium (see below) is used to demonstrate phosphate solubilising activity of the treated seed. 9cm petri dishes are divided into quadrants and a seed is placed in the centre of each quadrant. Plates are incubated at 20 C
for 4 days.
Active phosphate solubilising agents produce clear zones around the seed as they solubilise the insoluble mineral phosphates within the media. The radius of the clear zones is measured and compared to the mean results achieved for each treatment.
Differences are analysed using one-way ANOVA and Tukey Post-Hoc diagnostic test where significance is found.
Phosphate uptake by plant Seeds are treated as described above.
Sure to Grow PET grow cubes (25x25x38mm) are soaked in deionised water containing 1%
Ca3(PO4)2 in suspension until saturated. Cubes are placed in free draining plant trays on a level surface to prevent nutrient run-off and migration whilst taking care to avoid pooling of water at the root zone. 10 cubes are used per tray and the mean of these represents one replicate. Each treatment is replicated 8 times.
A single Oilseed rape seed is placed in the cross-cut X in the top of each cube. Seed trays are then covered to maintain a humid environment and regularly top watered with the 1%
Ca3(PO4)2 suspension to maintain a moist cube. Trays are incubated at 20 C and
10 C on a 16/8hr thermal cycle. On germination the cover is removed and the seedling exposed to lighting on a 16/8hr photoperiod.
After 15 days the plants are removed from the grow cube and nutrient content of the plant tissue is analysed using the ICP method described above.
Differences in the Phosphate content between treatments are assessed statistically using one-way ANOVA.
Pikovskays' Medium Components Quantities (g r) Glucose 10 Ca3(PO4)2 5 (NH4)2SO4 0.5 NaCI 0.2 MgSO4.7H20 0.1 KCI 0.2 Yeast Extract 0.5 MnSO4.H20 0.002 FeSO4.7H20 0.002 pH 7.0
After 15 days the plants are removed from the grow cube and nutrient content of the plant tissue is analysed using the ICP method described above.
Differences in the Phosphate content between treatments are assessed statistically using one-way ANOVA.
Pikovskays' Medium Components Quantities (g r) Glucose 10 Ca3(PO4)2 5 (NH4)2SO4 0.5 NaCI 0.2 MgSO4.7H20 0.1 KCI 0.2 Yeast Extract 0.5 MnSO4.H20 0.002 FeSO4.7H20 0.002 pH 7.0
Claims (22)
1. A coating composition for an oilseed in the form of particles comprising i) at least one organic material selected from natural waxes, synthetic waxes and mineral waxes having a melting point of 50°Centigrade, wherein the wax is in the form of particles having a volume mean diameter 51.1m; and ii) at least one additive for enhancing seedling vigour and/or seedling growth from oilseed plant seed wherein the at least one additive is selected from one or more inorganic additives and/or one or more live biological agents.
2. A coating composition according to claim 1, wherein the at least one additive is a live biological agent that is selected from saprophytic fungi.
3. A coating composition according to claim 1 or 2, wherein the live biological agent is spores of the saprophytic fungus, Penicillium bilaii.
4. A coating composition according to any one of claims 1 to 3, wherein the particles have a mean volume diameter in the range from >=10µm to 200µm.
5. A coating composition according to any one of claims 1 to 4, wherein the organic material is selected from carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, myricyl palmitate, cetyl palmitate, candelilla wax, castor wax, ouricury wax, and rice bran wax; or a mixture of two or more thereof.
6. A coating composition according to any one of claims 1 to 5, wherein the particles are carnauba wax particles.
7. Use of an organic material in the form of particles of wax having a melting point of >=50°Centigrade in the manufacture of a composition for coating oil seeds according to any one of claims 1 to 5.
8. Use according to claim 7, wherein the at least one wax is selected from carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax; or a mixture of two or more thereof.
9. Use according to claim 7 or 8, wherein the oilseed coating composition comprises particles of carnauba wax.
10. A method of manufacturing a coating composition fox oilseed according to any one of claims 1 to 6 that comprises 1) selecting solid organic material wherein the solid organic material is a wax having a melting point of 50°Centigrade;
2) machining said organic material into particles of a mean volume diameter >= 10µm; and 3) adding one or more additives for enhancing seedling vigour and/or seedling growth selected from one or more inorganic additives and/or one or more live biological agents.
2) machining said organic material into particles of a mean volume diameter >= 10µm; and 3) adding one or more additives for enhancing seedling vigour and/or seedling growth selected from one or more inorganic additives and/or one or more live biological agents.
11. A method according to claim 10, wherein the organic material is selected from carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax; or a mixture of two or more thereof.
12. A method according to claim 10 or 11, wherein the said material is carnauba wax.
13. A coating composition according to any one of claims 1 to 6, wherein the oilseed is selected from oilseeds selected from members of the Crucifer family (Canola (B. campestris) and oilseed rape (B.
napus), sunflower, peanut, safflower, sesame, nut oils, carob, coriander, mustard, grape, linseed (flax), dika, hemp, okra, pine, poppy, castor, and jojoba.
napus), sunflower, peanut, safflower, sesame, nut oils, carob, coriander, mustard, grape, linseed (flax), dika, hemp, okra, pine, poppy, castor, and jojoba.
14. A coating composition according to any one of claims 1 to 6, wherein the oilseeds are selected from canola (B. campestris), oilseed rape (B. napus), sunflower, peanut, linseed (flax)and nut oils.
15. A coating composition according to claim 14, wherein the oilseeds are selected from B. napus and B. campestris.
16. A method of coating oilseeds with a coating composition according to any one of claims 1 to 6 and claims 13 to 15 in dry particulate form that comprises at least one organic material selected from natural waxes, synthetic waxes and mineral waxes having a melting point of 50°Centigrade, the method comprising:
i) obtaining organic material as a population of particles of wax of a pre-determined VMD; and ii) applying the said population of particles to oilseeds.
i) obtaining organic material as a population of particles of wax of a pre-determined VMD; and ii) applying the said population of particles to oilseeds.
17. A method according to claim 16, wherein the coating composition comprises a wax in particulate form selected from carnauba wax, beeswax, montan wax, Chinese wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax, and rice bran wax or mixtures of two or more thereof.
18. A method of coating oilseeds according to any one of claims 14 to 17 with a coating composition that comprises an organic material wherein the organic material is selected from waxes having a melting point of 50°Centigrade, the method comprising i) obtaining said organic material;
ii) heating the organic material so as to form a liquid phase or a gaseous phase;
iii) cooling the liquid phase or gaseous phase of ii) to below the melting point of the organic material, forming a solid;
iv) adding one or more additives to the solid formed in iii);
v) machining the solid organic material of iii) into particles of a pre-determined VMD; and vi) applying the particles of v) to oilseeds.
ii) heating the organic material so as to form a liquid phase or a gaseous phase;
iii) cooling the liquid phase or gaseous phase of ii) to below the melting point of the organic material, forming a solid;
iv) adding one or more additives to the solid formed in iii);
v) machining the solid organic material of iii) into particles of a pre-determined VMD; and vi) applying the particles of v) to oilseeds.
19. A method according to any one of claims 16 to 18, wherein the organic material is carnauba wax.
20. Oilseeds comprising a coating composition according to any one of claims 1 to 6.
21. Oilseeds according to claim 20 that are selected from oilseeds selected from members of the Crucifer family (Canola (B. campestris) and oilseed rape (B. napus), sunflower, peanut, safflower, sesame, nut oils, carob, coriander, mustard, grape, linseed (flax), dika, hemp, okra, pine, poppy, castor, and jojoba.
22. Oilseeds according to claim 20 or 21 that are selected from canola (B. campestris), oilseed rape (B. napus), sunflower, peanut, linseed (flax) and nut oils.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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GB201106762A GB201106762D0 (en) | 2011-04-20 | 2011-04-20 | Compositions for growth and vigour from oilseeds |
GB1106762.6 | 2011-04-20 | ||
PCT/GB2012/000366 WO2012143684A2 (en) | 2011-04-20 | 2012-04-19 | Compositions for growth and vigour from oilseeds |
Publications (2)
Publication Number | Publication Date |
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CA2841043A1 true CA2841043A1 (en) | 2012-10-26 |
CA2841043C CA2841043C (en) | 2015-02-24 |
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CA2841043A Active CA2841043C (en) | 2011-04-20 | 2012-04-19 | Compositions for growth and vigour from oilseeds |
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CA (1) | CA2841043C (en) |
GB (2) | GB201106762D0 (en) |
WO (1) | WO2012143684A2 (en) |
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GB201615711D0 (en) * | 2016-09-15 | 2016-11-02 | Exosect Ltd | Coated Product form |
US10165743B2 (en) | 2017-03-28 | 2019-01-01 | Martin FILION | Rhizobacterial strain and uses for enhancing total lipid yields in an oilseed crop |
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US2936226A (en) * | 1955-06-20 | 1960-05-10 | Gulf Research Development Co | Soil nutrient composition and method for preparing same |
GB2118158B (en) * | 1982-03-03 | 1985-09-11 | Biochemical Marketing Corp | Plant growth stimulators comprising metal ions and long-chain alkyl carboxylic acids and salts and derivatives thereof |
US5283060A (en) * | 1982-09-29 | 1994-02-01 | Shieh Tsuong R | Bacillus-containing pesticide granules |
DE3721852A1 (en) | 1987-07-02 | 1989-01-12 | Bayer Ag | FUNGICIDAL SEED TREATMENT AGENTS |
ES2064484T3 (en) | 1988-09-02 | 1995-02-01 | Hoechst Ag | AQUEOUS FORMULATIONS AND THEIR USE. |
JPH05305226A (en) * | 1992-04-28 | 1993-11-19 | Takeda Chem Ind Ltd | Particle and production thereof |
IL121496A (en) * | 1997-08-07 | 2001-06-14 | Univ Ben Gurion | Controlled-release encapsulated fertilizers |
CN1188035C (en) * | 1999-09-17 | 2005-02-09 | 中国石油化工集团公司 | Wax emulsion for treating seeds and its preparation and usage |
DE10018396A1 (en) * | 2000-04-13 | 2001-10-18 | Bayer Ag | Production of agrochemical wax premix useful for the production of agrochemical agents for the treatment of plants, especially in aquatic cultivations, e.g. paddy fields |
BRPI0507624A (en) * | 2004-02-16 | 2007-07-03 | Basf Ag | formulation for seed treatment, use of a polymer or copolymer, seeds, methods for seed treatment prior to sowing, use of a formulation, method for controlling unwanted vegetation and / or for combating phytopathogenic insects and / or of plant pathogenic backgrounds |
US20070072775A1 (en) * | 2005-09-29 | 2007-03-29 | Oms Investments, Inc. | Granular controlled release agrochemical compositions and process for the preparation thereof |
GB0623398D0 (en) * | 2006-11-23 | 2007-01-03 | Exosect Ltd | Arthropod control |
EP2229808A1 (en) * | 2009-03-17 | 2010-09-22 | Incotec International B.V. | Seed coating composition |
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CA2841043C (en) | 2015-02-24 |
GB201106762D0 (en) | 2011-06-01 |
GB2490248A (en) | 2012-10-24 |
WO2012143684A2 (en) | 2012-10-26 |
WO2012143684A3 (en) | 2013-06-13 |
GB201206969D0 (en) | 2012-06-06 |
GB2490248B (en) | 2015-12-02 |
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