WO2012053907A1 - Improved fertiliser compositions - Google Patents

Improved fertiliser compositions Download PDF

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Publication number
WO2012053907A1
WO2012053907A1 PCT/NZ2011/000215 NZ2011000215W WO2012053907A1 WO 2012053907 A1 WO2012053907 A1 WO 2012053907A1 NZ 2011000215 W NZ2011000215 W NZ 2011000215W WO 2012053907 A1 WO2012053907 A1 WO 2012053907A1
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WO
WIPO (PCT)
Prior art keywords
cobalt
composition
mixed
qrc
pasture
Prior art date
Application number
PCT/NZ2011/000215
Other languages
French (fr)
Inventor
Michael Wesley Brown
Murray Selwin Zander
Original Assignee
South Star Fertilizers Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by South Star Fertilizers Ltd filed Critical South Star Fertilizers Ltd
Publication of WO2012053907A1 publication Critical patent/WO2012053907A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G51/00—Compounds of cobalt
    • C01G51/10—Sulfates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G51/00—Compounds of cobalt
    • C01G51/06—Carbonates
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C05D9/02—Other inorganic fertilisers containing trace elements

Definitions

  • the present invention relates to improved fertiliser compositions. Particularly, although not exclusively, the present invention relates to a mixed release profile composition and methods of using such compositions in the treatment of soil deficient in cobalt.
  • Cobalt is a trace element essential to the well-being of animals and plants as it forms the active centre of co-enzymes called cobalamins such as for example vitamin B-12.
  • cobalamins such as for example vitamin B-12.
  • many pastures and soils are deficient in cobalt such as the pumice soils of New Zealand and Australia.
  • a deficiency in cobalt leads to the lethal condition of pernicious anemia (i.e. emaciation then death). Exposure to cobalt can also be toxic if safe levels are exceeded. So cobalt whilst essential for life is only required in minute amounts.
  • Cobalt deficiency in stock has historically been corrected by the administration of a drench containing cobalt sulphate to the stock.
  • Cobalt sulphate is, however, poisonous.
  • the high toxicity means that very small doses must be applied and drenching must therefore be carried out with high frequency.
  • Such labour intensive treatment methods are far from economical.
  • Another method for addressing cobalt deficiency in grazing animals involves the application of cobalt sulphate directly to pastures.
  • the cobalt is taken up by plants and is thereby made available to grazing animals.
  • Pasture cobalt levels rise very rapidly following direct application.
  • available cobalt sulphate levels decline at a rate faster than desired due to leaching from the soil and luxury plant uptake.
  • a mixed release rate composition characterised in that the composition comprises an acidulated phosphate together with a source of both slow release cobalt and quick release cobalt.
  • the present invention also provides a method for manufacturing a mixed release profile composition for application to pasture land comprising the steps of:
  • powdered citric acid may form part of the mixture coating the acidulated phosphate.
  • the at least partially dissolved QRC may be obtained by mixing a source of soluble cobalt with a suitable solvent via any method of mixing but in preferred embodiments involves stirring the source of cobalt with the solvent for a predetermined time.
  • the source of cobalt ions need not completely dissolve in the solvent and indeed incomplete dissolution of the source of cobalt ions in the solvent results in some of the source of cobalt ions being present which cannot penetrate into the acidulated phosphate once added to the mixture. Extended release formulations made using an incompletely dissolved source of cobalt ions may thereby provide desirable extended release profiles due to some of the cobalt being available at the surface of the acidulated phosphate.
  • the suitable solvent may be any liquid in which an amount of the source of cobalt ions may be dissolved.
  • One of skill in the art will be able to determine which solvents are suitable for use in the method of the present invention without undue experimentation and without having any to exert any additional inventive input of their own.
  • the solvent may be water. In particularly preferred embodiments the solvent may be hot water.
  • the QRC may be a substantially water soluble cobalt.
  • the water soluble cobalt may preferably be cobalt sulphate.
  • the suitable glue may be in the form of an oil, gum or polymer.
  • the suitable glue may be Xanthate gum.
  • the glue is used to help adhere the SRC, adsorbent layer to the QRC saturated acidulated phosphate.
  • the SRC may be a substantially water insoluble cobalt. Most preferably the SRC may be cobalt carbonate.
  • the SRC may be mixed with an adsorbent compound which is used to form a layer which surrounds the QRC saturated acidulated phosphate.
  • the adsorbent compound may be bentonite or zeolite but other adsorbents with similar properties may also be used.
  • bentonite may be calcium or sodium bentonite.
  • the preferred type of zeolite may have an average particle size of below 100 microns.
  • the SRC and adsorbent compound mixture may also be mixed with an amount of citric acid.
  • the inventors have surprisingly found that adjusting the amount of citric acid relative to the amount of SRC can be used to manipulate when the SRC will be released into the soil. In general the more citric acid that is added the quicker the release of the SRC into the soil. Thus, it is possible to create a composition which has little or no lag time between depletion of the QRC source of cobalt and the release of the SRC to the soil.
  • citric acid to alter the solubility of cobalt carbonate in a composition.
  • the composition may generally be a fertiliser composition but this need not be seen as limiting.
  • the final product may be further encapsulated with an additional outermost protective layer.
  • the additional outermost protective layer may preferably be a water soluble biodegradable oil, gum or polymer. This outermost layer further provides a barrier between the cobalt and the environment during the handling stages.
  • the outermost protective layer may be in the form of an oil such as Pearl manufactured by Lake Technologies International from South Africa.
  • 'phosphate' refers to the P0 4 3" ion or to any compound containing this ion.
  • the acidulated phosphate may be diammonium phosphate, monammonium phosphate, super-phosphate, and triple super-phosphate or any other suitably acidulated phosphate.
  • the phosphate may be super-phosphate.
  • the phosphate may be acidulated by any organic or inorganic acid in any amount. More desirable extended release properties may result from increased acidulation of the phosphate.
  • the phosphate may be acidulated by the addition of an inorganic acid selected from the group consisting of phosphoric acid, sulphuric acid, nitric acid and hydrohalic acid.
  • the phosphate may be acidulated by phosphoric acid.
  • the phosphate may be in the form of a powder, a granule, a pellet or any other solid form.
  • the phosphate may be of any size and any size distribution and may contain anions other than phosphate as well as water and other impurities.
  • the phosphate may be in the form of a granule.
  • the phosphate may be in the form of a granule having an average size of about 1 mm to about 5mm in diameter.
  • 'cobalt' refers to the cobalt ion or a compound containing this ion.
  • the source of cobalt ions may comprise any cation or cations combined with cobalt ions so long as the resultant salt is at least partially water soluble.
  • the present invention provides a method for increasing the cobalt concentration of a soil substrate comprising applying to the soil substrate a mixed release profile composition substantially as described above.
  • Preferred embodiments of the method of manufacture comprise the additional step of removing some or all of the solvent from the composition.
  • the step of removing the solvent from the composition may take the form of fluidised bed drying and the like or simply allowing the product to stand.
  • the product may be additionally coated with one or more agents to prevent contamination during handling.
  • the contamination preventing agents may be any substance that can form a barrier between QRC absorbed on the surface of the acidulated phosphate and the environment at large. Those agents may be water soluble gums, polymers, or other suitable materials.
  • the present invention also provides a method for increasing the cobalt concentration of a soil substrate or within plants comprising the step of applying to the soil substrate an mixed release profile composition manufactured according to the present invention.
  • Figure 1 shows the release profile of a mixed release rate composition in accordance with one preferred embodiment of the present invention.
  • Fresh superphosphate granules (198g) having an average particle size of 2mm were added to a bowl.
  • the liquid phase is now added to the bowl of superphosphate and mixed together.
  • the solid phase is the spread evenly over the surface of the "wetted" superphosphate.
  • the bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
  • the product is then placed in a tray and inspected.
  • the finished product should have an even pale purple colour.
  • Fresh superphosphate granules (415g) having an average particle size of 2mm were added to a bowl.
  • the liquid phase is now added to the bowl of superphosphate and mixed together.
  • the solid phase is the spread evenly over the surface of the "wetted" superphosphate.
  • the bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
  • Fresh superphosphate granules (41 Og) having an average particle size of 2mm were added to a bowl.
  • the liquid phase is now added to the bowl of superphosphate and mixed together.
  • the solid phase is the spread evenly over the surface of the "wetted" superphosphate.
  • the bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
  • Example 4 (code-C21A)
  • Fresh superphosphate granules (415g) having an average particle size of 2mm were added to a bowl.
  • the liquid phase is now added to the bowl of superphosphate and mixed together.
  • the solid phase is the spread evenly over the surface of the "wetted" superphosphate.
  • the bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
  • the product is then placed in a tray and inspected.
  • the finished product should have an even dark purple colour.
  • the "Wetted Matrix” then was placed into drum and the solid phase is spread evenly over the surface of the "wetted” superphosphate and the drum was rotated for 2-3 minutes.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fertilizers (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Medicinal Preparation (AREA)

Abstract

A mixed release rate composition characterised in that the composition comprises an acidulated phosphate together with a source of both slow release cobalt and quick release cobalt.

Description

IMPROVED FERTILISER COMPOSITIONS
TECHNICAL FIELD
The present invention relates to improved fertiliser compositions. Particularly, although not exclusively, the present invention relates to a mixed release profile composition and methods of using such compositions in the treatment of soil deficient in cobalt.
BACKGROUND ART
For ease of reference only the present invention will now be discussed in relation to a cobalt containing fertilizer composition. The problems that occur with Cobalt also occur with other trace elements and minerals.
Cobalt is a trace element essential to the well-being of animals and plants as it forms the active centre of co-enzymes called cobalamins such as for example vitamin B-12. However, many pastures and soils are deficient in cobalt such as the pumice soils of New Zealand and Australia. A deficiency in cobalt leads to the lethal condition of pernicious anemia (i.e. emaciation then death). Exposure to cobalt can also be toxic if safe levels are exceeded. So cobalt whilst essential for life is only required in minute amounts.
Cobalt deficiency in stock has historically been corrected by the administration of a drench containing cobalt sulphate to the stock. Cobalt sulphate is, however, poisonous. The high toxicity means that very small doses must be applied and drenching must therefore be carried out with high frequency. Such labour intensive treatment methods are far from economical.
Another method for addressing cobalt deficiency in grazing animals involves the application of cobalt sulphate directly to pastures. The cobalt is taken up by plants and is thereby made available to grazing animals. Pasture cobalt levels rise very rapidly following direct application. However available cobalt sulphate levels decline at a rate faster than desired due to leaching from the soil and luxury plant uptake.
It is an object of the present invention to provide a cobalt formulation which addresses the problems highlighted herein with the prior art methods and/or formulations or at the very least to provide the public and the trade with a useful choice.
All references, including any patents or patent applications cited in this specification are hereby incorporated by reference. No admission is made that any reference constitutes prior art. The discussion of the references states what their authors assert, and the applicants reserve the right to challenge the accuracy and pertinency of the cited documents. It will be clearly understood that, although a number of prior art publications are referred to herein, this reference does not constitute an admission that any of these documents form part of the common general knowledge in the art, in New Zealand or in any other country.
It is acknowledged that the term 'comprise' may, under varying jurisdictions, be attributed with either an exclusive or an inclusive meaning. For the purpose of this specification, and unless otherwise noted, the term 'comprise' shall have an inclusive meaning - i.e. that it will be taken to mean an inclusion of not only the listed components it directly references, but also other non-specified components or elements. This rationale will also be used when the term 'comprised' or 'comprising' is used in relation to one or more steps in a method or process.
Further aspects and advantages of the present invention will become apparent from the ensuing description which is given by way of example only.
DISCLOSURE OF INVENTION
According to one aspect of the present invention there is provided a mixed release rate composition characterised in that the composition comprises an acidulated phosphate together with a source of both slow release cobalt and quick release cobalt.
In a further aspect the present invention also provides a method for manufacturing a mixed release profile composition for application to pasture land comprising the steps of:
• mixing a source of quick release cobalt (QRC) and a suitable glue with a suitable solvent to create a QRC source-solvent mixture;
• exposing an acidulated phosphate granule to the QRC source-solvent mixture; and • removing excess solvent; and
• applying powdered a mixture of a slow release cobalt (SRC), a powdered adsorbent compound to the QRC coated acidulated phosphate to provide an outer coating layer thereon.
In a preferred embodiment powdered citric acid may form part of the mixture coating the acidulated phosphate.
The at least partially dissolved QRC may be obtained by mixing a source of soluble cobalt with a suitable solvent via any method of mixing but in preferred embodiments involves stirring the source of cobalt with the solvent for a predetermined time. The source of cobalt ions need not completely dissolve in the solvent and indeed incomplete dissolution of the source of cobalt ions in the solvent results in some of the source of cobalt ions being present which cannot penetrate into the acidulated phosphate once added to the mixture. Extended release formulations made using an incompletely dissolved source of cobalt ions may thereby provide desirable extended release profiles due to some of the cobalt being available at the surface of the acidulated phosphate.
The suitable solvent may be any liquid in which an amount of the source of cobalt ions may be dissolved. One of skill in the art will be able to determine which solvents are suitable for use in the method of the present invention without undue experimentation and without having any to exert any additional inventive input of their own.
In preferred embodiments the solvent may be water. In particularly preferred embodiments the solvent may be hot water.
The QRC may be a substantially water soluble cobalt. The water soluble cobalt may preferably be cobalt sulphate.
The suitable glue may be in the form of an oil, gum or polymer.
In preferred embodiments the suitable glue may be Xanthate gum.
The glue is used to help adhere the SRC, adsorbent layer to the QRC saturated acidulated phosphate.
The SRC may be a substantially water insoluble cobalt. Most preferably the SRC may be cobalt carbonate.
In preferred embodiments the SRC may be mixed with an adsorbent compound which is used to form a layer which surrounds the QRC saturated acidulated phosphate.
The adsorbent compound may be bentonite or zeolite but other adsorbents with similar properties may also be used.
The preferred type of bentonite may be calcium or sodium bentonite.
The preferred type of zeolite may have an average particle size of below 100 microns. The SRC and adsorbent compound mixture may also be mixed with an amount of citric acid.
The inventors have surprisingly found that adjusting the amount of citric acid relative to the amount of SRC can be used to manipulate when the SRC will be released into the soil. In general the more citric acid that is added the quicker the release of the SRC into the soil. Thus, it is possible to create a composition which has little or no lag time between depletion of the QRC source of cobalt and the release of the SRC to the soil.
The use of citric acid to alter the solubility of cobalt carbonate in a composition.
The composition may generally be a fertiliser composition but this need not be seen as limiting.
Preferably, the final product may be further encapsulated with an additional outermost protective layer.
The additional outermost protective layer may preferably be a water soluble biodegradable oil, gum or polymer. This outermost layer further provides a barrier between the cobalt and the environment during the handling stages.
In some preferred embodiment the outermost protective layer may be in the form of an oil such as Pearl manufactured by Lake Technologies International from South Africa.
The term 'phosphate' refers to the P04 3" ion or to any compound containing this ion.
The acidulated phosphate may be diammonium phosphate, monammonium phosphate, super-phosphate, and triple super-phosphate or any other suitably acidulated phosphate.
For ease of reference only the 'acidulated phosphate' will now be referred to simply as phosphate.
In preferred embodiments the phosphate may be super-phosphate.
The phosphate may be acidulated by any organic or inorganic acid in any amount. More desirable extended release properties may result from increased acidulation of the phosphate.
In preferred embodiments the phosphate may be acidulated by the addition of an inorganic acid selected from the group consisting of phosphoric acid, sulphuric acid, nitric acid and hydrohalic acid.
In particularly preferred embodiments the phosphate may be acidulated by phosphoric acid.
The phosphate may be in the form of a powder, a granule, a pellet or any other solid form. The phosphate may be of any size and any size distribution and may contain anions other than phosphate as well as water and other impurities. In preferred embodiments the phosphate may be in the form of a granule.
In particularly preferred embodiments the phosphate may be in the form of a granule having an average size of about 1 mm to about 5mm in diameter.
The term 'cobalt' refers to the cobalt ion or a compound containing this ion.
The source of cobalt ions may comprise any cation or cations combined with cobalt ions so long as the resultant salt is at least partially water soluble.
In a further aspect the present invention provides a method for increasing the cobalt concentration of a soil substrate comprising applying to the soil substrate a mixed release profile composition substantially as described above.
Preferred embodiments of the method of manufacture comprise the additional step of removing some or all of the solvent from the composition.
The step of removing the solvent from the composition may take the form of fluidised bed drying and the like or simply allowing the product to stand.
In some embodiments the product may be additionally coated with one or more agents to prevent contamination during handling. The contamination preventing agents may be any substance that can form a barrier between QRC absorbed on the surface of the acidulated phosphate and the environment at large. Those agents may be water soluble gums, polymers, or other suitable materials.
The present invention also provides a method for increasing the cobalt concentration of a soil substrate or within plants comprising the step of applying to the soil substrate an mixed release profile composition manufactured according to the present invention.
The preferred embodiments of the present invention can have one or more of the following advantages over the prior art which may include:
• providing a composition having both quick and extended release forms of cobalt to provide an initial release boost of cobalt to the soil followed by a gradual release of cobalt to the soil over a sustained period.
• improving the handling/safety characteristics of a mixed release cobalt composition;
• providing a mixed release profile fertiliser;
• the ease with which the product may be manufactured and applied;
• the cost of production and application, and
• the relative increase in available cobalt and low toxicity of the resulting formulation once applied over an area of land.
BRIEF DESCRIPTION OF DRAWINGS
Further aspects of the present invention will become apparent from the following description which is given by way of example only and with reference to the accompanying drawings in which:
Figure 1 shows the release profile of a mixed release rate composition in accordance with one preferred embodiment of the present invention.
BEST MODES FOR CARRYING OUT THE INVENTION
Example 1 (Code C26)
Fresh superphosphate granules (198g) having an average particle size of 2mm were added to a bowl.
Liquid Phase
In a separate bowl 20g of CoS04.7H20 is added into 20mL warm water (approximately 20 degrees Celsius) and is stirred to dissolve. Then 2.5g of Xanthate gum is added and the mixture is stirred well.
Solid Phase
In a separate bowl combine 18g of CoC03 and 10g zeolite (250microns average diameter) and 5g citric acid and mix together well.
The liquid phase is now added to the bowl of superphosphate and mixed together.
The solid phase is the spread evenly over the surface of the "wetted" superphosphate. The bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
The product is then placed in a tray and inspected. The finished product should have an even pale purple colour.
Example 2 (code-C21 )
Fresh superphosphate granules (415g) having an average particle size of 2mm were added to a bowl.
Liquid Phase
In a separate bowl 20g of CoS04.7H20 is added into 40mL warm water (approximately 20 degrees Celsius) and is stirred to dissolve. Then 5g of Xanthate gum is added and the mixture is stirred well.
Solid Phase
In a separate bowl 45g of CoC03 and 20g zeolite (250microns average diameter).
The liquid phase is now added to the bowl of superphosphate and mixed together.
The solid phase is the spread evenly over the surface of the "wetted" superphosphate. The bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
The product is then placed in a tray and inspected. The finished product should have an even dark purple colour. Example 3 (code-C22)
Fresh superphosphate granules (41 Og) having an average particle size of 2mm were added to a bowl.
Liquid Phase
In a separate bowl 20g of CoS04.7H20 is added into 40ml_ warm water (approximately 20 degrees Celsius) and is stirred to dissolve. Then 5g of Xanthate gum is added and the mixture is stirred well.
Solid Phase
In a separate combine bowl 45g of CoC03 and 20g zeolite (250 microns average diameter) and 5g citric acid and mix together well.
The liquid phase is now added to the bowl of superphosphate and mixed together.
The solid phase is the spread evenly over the surface of the "wetted" superphosphate. The bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
The product is then placed in a tray and inspected. The finished product should have an even dark purple colour. Example 4 (code-C21A)
Fresh superphosphate granules (415g) having an average particle size of 2mm were added to a bowl.
Liquid Phase
In a separate bowl 20g of CoS04.7H20 is added into 40mL warm water (approximately 20 degrees Celsius) and is stirred to dissolve. Then 5g of Xanthate gum is added and the mixture is stirred well.
Solid Phase
In a separate bowl 45g of CoC03 and 20g calcium bentonite (250microns average diameter).
The liquid phase is now added to the bowl of superphosphate and mixed together.
The solid phase is the spread evenly over the surface of the "wetted" superphosphate. The bowl is rotated in order to effect the even spread of the solid phase over the wetted granules for 2-3 minutes.
The product is then placed in a tray and inspected. The finished product should have an even dark purple colour.
The inventors have found using bentonite in place of zeolite gives a harder granule. Example 5 (code C-28)
Fresh superphosphate granules 407.5g having an average particle size of 2mm were placed into a bowl
Liquid Phase
In a separate bowl 40g of CoS04.7H20 were added to 36ml of warm water and stirred to dissolve. Then 5g of Xanthate gum was added to this suspension and stirred well.
Solid Phase
In a separate bowl, 36g CoC03 and 10g bentonite (250 microns average diameter) and 7.5g citric acid were added together and mixed well.
Wetted Matrix
The liquid phase was then added to the superphosphate in a bowl and mixed well to form a "Wetted Matrix".
The "Wetted Matrix" then was placed into drum and the solid phase is spread evenly over the surface of the "wetted" superphosphate and the drum was rotated for 2-3 minutes.
The product is then placed in a tray and inspected. The finished product should have an even darker purple colour than observed with previous examples. The release profile of this C28 composition is shown in Figure 1 at pH of 5.5 and a pH of 6.0
Aspects of the present invention have been described by way of example only and it should be appreciated that modifications and additions may be made thereto without departing from the scope of the appended claims.

Claims

WHAT WE CLAIM IS:
1. A mixed release rate composition characterised in that the composition comprises an acidulated phosphate together with a source of both slow release cobalt and quick release cobalt.
2. A mixed release rate composition as claimed in claim 1 wherein the quick release cobalt is water soluble.
3. A mixed release rate composition as claimed in claim 1 wherein the water soluble cobalt is cobalt sulphate.
4. A mixed release rate composition as claimed in claim 1 wherein the slow release cobalt is a substantially water insoluble cobalt.
5. A mixed release rate composition as claimed in claim 1 wherein the substantially water insoluble cobalt is cobalt carbonate.
6. A method for manufacturing a mixed release profile composition for application to pasture land comprising the steps of:
• mixing a source of quick release cobalt (QRC) and a suitable glue with a suitable solvent to create a QRC source-solvent mixture;
• exposing an acidulated phosphate granule to the QRC source- solvent mixture; • removing excess solvent; and
• applying powdered a mixture of a slow release cobalt (SRC), a powdered adsorbent compound to the QRC coated acidulated phosphate to provide an outer coating layer thereon.
7. A method for manufacturing a mixed release profile composition for application to pasture as claimed in claim 6 wherein the QRC is a substantially water soluble cobalt.
8. A method for manufacturing a mixed release profile composition for application to pasture as claimed in claim 6 wherein the water soluble cobalt is cobalt sulphate.
9. A method for manufacturing a mixed release profile composition for application to pasture as claimed in claim 6 wherein the suitable glue may be in the form of an oil, gum or polymer.
10. A method for manufacturing a mixed release profile composition for application to pasture as claimed in claim 6 wherein the suitable glue is Xanthate gum.
11. A method for manufacturing a mixed release profile composition for application to pasture as claimed in claim 6 wherein the SRC may be mixed with an adsorbent compound which is used to form a layer which surrounds the QRC saturated acidulated phosphate. A mixed release rate composition substantially as described herein with reference to any example and/or drawing thereof.
A method for manufacturing a mixed release profile composition for application to pasture substantially as described herein with reference to any example and/or drawing thereof.
PCT/NZ2011/000215 2010-10-18 2011-10-18 Improved fertiliser compositions WO2012053907A1 (en)

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Application Number Priority Date Filing Date Title
NZ58863210A NZ588632A (en) 2010-10-18 2010-10-18 Improved Fertiliser Compositions comprising acidulated phosphate together with a source of both water insoluble cobalt and water soluble cobalt
NZ588632 2010-10-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014198000A1 (en) 2013-06-14 2014-12-18 Ostara Nutrient Recovery Technologies Inc. Slow and fast release fertilizer composition and methods for making same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU754223B2 (en) * 1997-07-18 2002-11-07 Impact Fertilisers Pty Ltd A coating process
WO2010089776A1 (en) * 2009-02-03 2010-08-12 Chandrika Varadachari Micronutrient fertilizers and methods of making and using the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU754223B2 (en) * 1997-07-18 2002-11-07 Impact Fertilisers Pty Ltd A coating process
WO2010089776A1 (en) * 2009-02-03 2010-08-12 Chandrika Varadachari Micronutrient fertilizers and methods of making and using the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014198000A1 (en) 2013-06-14 2014-12-18 Ostara Nutrient Recovery Technologies Inc. Slow and fast release fertilizer composition and methods for making same
US9878960B2 (en) 2013-06-14 2018-01-30 Ostara Nutrient Recovery Technologies Inc. Slow and fast release fertilizer composition and methods for making same
US10513470B2 (en) 2013-06-14 2019-12-24 Ostara Nutrient Recovery Technologies Inc. Slow and fast release fertilizer composition and methods for making same
EP3666747A1 (en) 2013-06-14 2020-06-17 Ostara Nutrient Recovery Technologies Inc. Slow and fast release fertilizer composition and methods for making same

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