WO2022196413A1 - Milieu de culture de plante et procédé de réutilisation de milieu de culture de plante - Google Patents

Milieu de culture de plante et procédé de réutilisation de milieu de culture de plante Download PDF

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Publication number
WO2022196413A1
WO2022196413A1 PCT/JP2022/009713 JP2022009713W WO2022196413A1 WO 2022196413 A1 WO2022196413 A1 WO 2022196413A1 JP 2022009713 W JP2022009713 W JP 2022009713W WO 2022196413 A1 WO2022196413 A1 WO 2022196413A1
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cellulose acetate
plant cultivation
cultivation medium
sheet
medium
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PCT/JP2022/009713
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English (en)
Japanese (ja)
Inventor
洋亮 中川
俊一 吉田
一秀 金村
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富士フイルム株式会社
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Priority to JP2023506983A priority Critical patent/JPWO2022196413A1/ja
Publication of WO2022196413A1 publication Critical patent/WO2022196413A1/fr

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/30—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds

Definitions

  • the present invention relates to a plant cultivation medium and a method for reusing the plant cultivation medium.
  • hydroponic cultivation using a medium for plant cultivation other than soil is widely practiced.
  • a plant cultivation medium in this case, an artificial medium using an artificial material such as rock wool, or a medium using a natural material such as peat moss or coconut shell, and a nutrient solution are used.
  • Patent Document 1 As a culture medium for raising seedlings made of rock wool, which gives environmental conditions suitable for raising seedlings and takes workability into consideration, a rock wool seedling raising medium in which a specific splitting portion is formed is known (Patent Document 1). .
  • Plant cultivation media that use rockwool are difficult to recycle after use. Therefore, they are to be discarded after use, and appropriate disposal is required as industrial waste, but disposal may pose a problem. Moreover, it is often difficult to reuse even a medium using a natural substance.
  • An object of the present invention is to provide a plant cultivation medium that can be easily reused, and a method for reusing the plant cultivation medium.
  • the plant cultivation medium of the present invention contains cellulose acetate blocks made of cellulose acetate having a degree of acetyl substitution of 0.4 or more.
  • the plant cultivation medium of the present invention contains a cellulose acetate sheet made of cellulose acetate having a degree of acetyl substitution of 0.4 or more.
  • the plant cultivation medium of the present invention contains cellulose acetate granules made of cellulose acetate having a degree of acetyl substitution of 0.4 or more.
  • the cellulose acetate block preferably has a volume of 1.0 ml or more.
  • the cellulose acetate sheet preferably has a thickness of 10 ⁇ m or more.
  • the cellulose acetate granules preferably have an average particle size of 3 mm or more as measured by a sieving method.
  • Cellulose acetate preferably has a degree of acetyl substitution within the range of 2.1 or more and 3.0 or less.
  • the cellulose acetate block, cellulose acetate sheet, or cellulose acetate granule preferably has a porosity higher than 66.6%.
  • a cellulose acetate block, a cellulose acetate sheet, or a cellulose acetate granule is preferably composed of a fibrous material.
  • the method for reusing a plant cultivation medium of the present invention is a method for reusing a used plant cultivation medium, and includes a dissolving step and a forming step.
  • the plant cultivation medium includes at least one of cellulose acetate blocks, cellulose acetate sheets, and cellulose acetate granules each made of cellulose acetate having a degree of acetyl substitution of 0.4 or more
  • the dissolving step includes: A cellulose acetate solution is obtained by dissolving the medium with an organic solvent.
  • the forming step uses the cellulose acetate melt to form at least one of cellulose acetate blocks, cellulose acetate sheets, and cellulose acetate granules.
  • the present invention it is possible to provide a plant cultivation medium that is easy to reuse and a method for reusing the plant cultivation medium.
  • FIG. 1 is a perspective view schematically showing a cubic cellulose acetate block.
  • FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining an example of the medium for plant cultivation containing a cellulose acetate block.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining an example of the medium for plant cultivation containing a cellulose acetate block.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining an example of the medium for plant cultivation containing a cellulose acetate block.
  • 1 is a perspective view schematically showing a cellulose acetate sheet cut into a substantially square;
  • FIG. 1 is a perspective view schematically showing a cellulose acetate sheet wound on a roll;
  • FIG. 1 is an explanatory diagram illustrating an example of a plant cultivation medium containing a cellulose acetate sheet and a cellulose acetate block; 1 is a perspective view schematically showing independent granular cellulose acetate granules.
  • FIG. FIG. 2 is a plan view schematically showing granular cotton-like cellulose acetate granules.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining an example of the medium for plant cultivation containing a cellulose-acetate granular material. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining an example of the medium for plant cultivation containing a cellulose-acetate granular material. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining an example of the medium for plant cultivation containing a cellulose acetate block.
  • the plant cultivation medium of the present invention contains cellulose acetate blocks, cellulose acetate sheets, or cellulose acetate granules made of cellulose acetate having a degree of acetyl substitution of 0.4 or more.
  • Cellulose acetate constituting the cellulose acetate block, cellulose acetate sheet, or cellulose acetate granule has a degree of acetyl substitution of 0.4 or more.
  • ⁇ -1,4-linked glucose units constituting cellulose have free hydroxyl groups at the 2-, 3- and 6-positions.
  • Cellulose acetate is a polymer in which some or all of these hydroxyl groups are esterified with acetyl groups.
  • the degree of acetyl substitution means the ratio of esterification of hydroxyl groups of cellulose at the 2-, 3- and 6-positions.
  • the plant cultivation medium As a plant cultivation medium, a medium containing cellulose acetate blocks, cellulose acetate sheets, or cellulose acetate granules made of cellulose acetate having a degree of acetyl substitution of 0.4 or more is used.
  • the plant cultivation medium exhibits sufficient functions as a plant cultivation medium for growing plants, and is a plant cultivation medium having strength, water resistance, air permeability, water permeability, or water retention. can be done. For example, it can hold plants from the initial stage to the final stage of plant cultivation, supply the plants with water, air, etc. necessary for growing the plants, does not adsorb nutrients, and has good circulation of water and air. In addition, it is stable over a long period of time and does not contain substances that inhibit plant growth.
  • the biodegradation rate of the plant cultivation medium is not too fast and is moderate. kept in By using a cellulose acetate block, a cellulose acetate sheet, or a cellulose acetate granule made of cellulose acetate having a degree of acetyl substitution of less than 0.4, the biodegradation rate of the plant cultivation medium is high, and the medium decomposes at an early stage. , there is a risk that the cultivation of the plant will become impossible during the growing process.
  • the degree of acetyl substitution of cellulose acetate is 0.4 or more, in addition to being suitable as a plant cultivation medium, reuse of the used plant cultivation medium is easy. Specifically, when reusing a used plant cultivation medium, the used medium is soluble in an organic solvent, and the polymer solution after dissolution is used to manufacture the same structure as before use. is possible. In addition, when performing the dissolution step of dissolving the used plant cultivation medium with an organic solvent, the separation between the plant cultivation medium and the roots of the plants is good, and the process does not take much time. is also short.
  • the biodegradation rate of the plant cultivation medium is high.
  • the ratio of decomposition into cellulose is high, and the ratio of reusability as cellulose acetate after use decreases.
  • the used plant cultivation medium is soluble in an organic solvent, it is practically difficult to manufacture the same structure as before use using the polymer solution after dissolution.
  • Cellulose acetate preferably has a degree of acetyl substitution within the range of 2.1 or more and 3.0 or less.
  • the degree of acetyl substitution is 2.1 or more, the biodegradation rate is moderate, the separability of the plant cultivation medium and the roots of the plant is further improved, and the recyclability such as easy reuse is achieved. high.
  • the degree of acetyl substitution is 3.0, triacetyl cellulose in which all the hydroxyl groups of cellulose acetate are substituted with acetyl groups is obtained. Separability between the culture medium and plant roots is particularly good, and recyclability is high, which is preferable.
  • the degree of acetylation of cellulose acetate is determined according to the measurement and calculation of the degree of acetylation in ASTM D871-96 (2019) (Standard Test Methods of Testing Cellulose Acetate).
  • the degree of acetyl substitution can also be measured by measuring the degree of acetyl substitution distribution by high-performance liquid chromatography.
  • the acetyl substitution distribution of cellulose acetate is measured by dissolving a sample in methylene chloride, using a column, Novapac phenyl (Waters), and using a mixture of methanol and water as an eluent (mass of methanol: water).
  • the acetyl substitution degree distribution was measured by a linear gradient from a mixture of dichloromethane and methanol (dichloromethane:methanol mass ratio of 9:1) to a mixture of dichloromethane and methanol (mass ratio of dichloromethane:methanol was 9:1).
  • the degree of acetyl substitution of cellulose acylate is preferably measured by high performance liquid chromatography.
  • cellulose acetate Any commonly used cellulose acetate can be used, and it may be obtained from either linter or pulp, or a mixture of multiple types.
  • the degree of acetyl substitution can be varied by adjusting the degree of substitution of acetyl groups to hydroxy groups of cellulose.
  • Substitution of an acetyl group to a hydroxy group of cellulose generally includes methods using acid anhydrides and mixed acid anhydrides.
  • a representative method for synthesizing cellulose acetate with a degree of acetyl substitution of 0.4 or more is the liquid-phase acetylation method using an acetic anhydride-acetic acid-sulfuric acid catalyst. Specifically, after pretreating a cellulose raw material such as wood pulp or cotton linter with an appropriate amount of acetic acid, it is put into a pre-cooled acetic acid mixed solution for acetic esterification, and cellulose triacetate (2nd, 3rd and 6th The total degree of acetyl substitution of the positions synthesizes approximately 3).
  • the acetic acid mixture generally contains acetic acid as a solvent, acetic anhydride as an esterifying agent and sulfuric acid as a catalyst.
  • Acetic anhydride is usually used in a stoichiometric excess over the total amount of cellulose reacting with it and water present in the system, so that after the acetylation reaction is completed, the amount of acetic anhydride remaining in the system is Hydrolysis of excess acetic anhydride and partial neutralization of the esterification catalyst is carried out by a neutralizing agent such as calcium, magnesium, iron, aluminum or zinc carbonates, acetates or oxides.
  • a neutralizing agent such as calcium, magnesium, iron, aluminum or zinc carbonates, acetates or oxides.
  • the resulting cellulose triacetate is then saponified and aged in the presence of a small amount of an acetylation reaction catalyst (generally residual sulfuric acid) to convert it to cellulose acetate having a specific degree of acetyl substitution and polymerization.
  • an acetylation reaction catalyst generally residual sulfuric acid
  • the catalyst remaining in the system is completely neutralized using a neutralizing agent as described above, or without neutralization, in water or dilute sulfuric acid.
  • a cellulose acetate solution is added to separate the cellulose acetate, and the cellulose acetate is obtained by washing and stabilization.
  • a cellulose acetate block, a cellulose acetate sheet, or a cellulose acetate granule made of cellulose acetate having a degree of acetyl substitution of 0.4 or more is formed from cellulose acetate as described above.
  • the cellulose acetate block, cellulose acetate sheet, or cellulose acetate granules may contain water in addition to cellulose acetate, since cellulose acetate can contain water.
  • the water content of cellulose acetate varies depending on the surrounding environment, and when the degree of acetyl substitution is 0.4 or more, water in the range of 0.1% or more and 10% or less based on the total mass of cellulose acetate is added. include.
  • a cellulose acetate block, a cellulose acetate sheet, or a cellulose acetate granule made of cellulose acetate having a degree of acetyl substitution of 0.4 or more has water retentivity and is suitable as a medium for plant cultivation.
  • the cellulose acetate block, cellulose acetate sheet, or cellulose acetate granules may be composed only of cellulose acetate as described above, but if necessary, additive components such as plasticizers and ultraviolet absorbers may be further added. may include. An appropriate amount of plasticizer is preferable because the strength of the medium for plant cultivation can be controlled.
  • the content of cellulose acetate in the cellulose acetate block, cellulose acetate sheet, or cellulose acetate granule is preferably 0.1% or more based on the total mass of cellulose acetate, and more Preferably it is 0.5% or more.
  • the cellulose acetate block 11 (hereinafter referred to as block 11) is formed into a block shape using cellulose acetate having a degree of acetyl substitution of 0.4 or more as a raw material.
  • the shape of the block may be a substantially cubic shape with one side having a length of about a as shown in FIG. Alternatively, it may have a substantially rectangular parallelepiped shape.
  • the block 11 need only be block-shaped, and does not need to be strictly a cube or the like.
  • the volume is 1.0 ml or more.
  • the volume of the block 11 is 1.0 ml, as shown in FIG.
  • a plant cultivation medium containing blocks 11 having a volume of 1.0 ml or more is easier to handle than a medium smaller than 1.0 ml, can be applied to many plants, and can be used for seeding, replanting, or the like. Easy to handle. Also, water or air permeability is favorable for plants. Moreover, the germination rate of the plant cultivated using this is high. Furthermore, after using the plant cultivation medium, the structure of the cellulose acetate block, the cellulose acetate sheet, or the cellulose acetate granule similar to that before use can be easily separated from the plant roots, etc., and the polymer solution after dissolution can be used. can be manufactured and reused easily.
  • the block 11 has a relatively small volume of 1.0 ml or more, it is possible to support a plant by placing seeds on the block 11 in, for example, a type of hydroponics such as hydroponics. Therefore, plants can be grown satisfactorily using the plant cultivation medium containing the blocks 11 and the nutrient solution. In this case, the plant grows by part of the root extending into the nutrient solution.
  • the volume of block 11 is preferably 10 ml or more, more preferably 20 ml or more. If it is 10 ml or more, it is easy to handle when using the block 11 alone as a plant cultivation medium.
  • the upper limit is preferably 1000 L or less, for example. This is because if the volume exceeds 1000 L, it is too large for a person to handle.
  • the block 11 is made of the fibrous material 12 .
  • Block 11 can therefore be a three-dimensional fibrous structure. As shown in FIG. 1, when the block 11 is a three-dimensional fiber structure made up of fibrous materials 12, when one side of the block 11 is partially enlarged, the fibrous materials 12 appear to be piled up. It can be seen that it is a three-dimensional structure. The fibrous material 12 will be described later. Also, the block 11 can be spongy. These three-dimensional fibrous structures or sponges are processed into desired shapes into blocks 11 .
  • the plant cultivation medium 10 including the blocks 11 can be used mainly as a plant cultivation medium for hydroponics.
  • the sizes, lengths, and the like of the respective members are shown schematically, and may differ from actual dimensions or dimensional ratios.
  • the plant cultivation medium 10 in this embodiment includes a block 11 which is a cube having a side a of about 3 cm and a volume of about 27 cm 3 .
  • a block 11 which is a cube having a side a of about 3 cm and a volume of about 27 cm 3 .
  • one plant 13 is grown.
  • a plant cultivation medium 10 in another embodiment includes a block 11 which is a rectangular parallelepiped with a length b of 20 cm, a width c of 90 cm, a height d of 5 cm, and a volume of about 9000 cm 3 . .
  • a plant cultivation medium 10 of FIG. 2 three plants 13 are grown at intervals.
  • a plant cultivation medium 10 in another embodiment includes a block 11 which is a cube having a side a of about 3 cm and a volume of about 27 cm 3 , a length b of 20 cm, a width c of 90 cm, and a block 11 which is a cuboid with a height d of 5 cm and a volume of about 9000 cm 3 .
  • Three cubic blocks 11 are placed on a rectangular parallelepiped cellulose acetate block 11 at intervals.
  • Three strains of plants 13 are grown in a plant cultivation medium 10 in which two types of blocks 11 having different sizes and shapes are combined. It is
  • the plant cultivation medium 10 includes one or more blocks 11.
  • one strain of a plant may be cultivated in one block, or a plurality of strains of plants may be cultivated.
  • a plurality of blocks 11 for cultivating one strain may be combined with another block 11 .
  • a plant cultivation medium 10 in which a plurality of blocks 11 are combined is preferable because replanting and movement of places are facilitated.
  • the block 11 is easy to handle because it is block-shaped. Moreover, the plant cultivation medium 10 including the blocks 11 is also easy to handle by including a plurality of the blocks 11 as described above. Since the plant cultivation medium 10 including the blocks 11 can be used alone as a plant cultivation medium, it is easy to select plants with good growth and to replant them during cultivation, which is preferable. In addition, since the plant cultivation medium 10 including the blocks 11 can be used in a plurality of forms as a plant cultivation medium, it is possible to fill containers having various shapes, which is preferable. In addition, the blocks 11 whose size, shape, etc. have been adjusted can be easily used by mixing with other types of plant cultivation medium materials. can be done.
  • the block 11 as described above can be manufactured by the following manufacturing method. For example, cellulose acetate having a degree of acetyl substitution of 0.4 or more is dissolved in a solvent to form a polymer solution, which is placed in a block-shaped container and dried and solidified. It can be produced by cutting into blocks by a method of making a continuous body. Since the porosity of the block 11 can be easily controlled, a method of discharging a polymer solution from a nozzle and solidifying it to form a three-dimensional fiber structure is preferred.
  • the cellulose acetate sheet 21 (hereinafter referred to as sheet 21) is formed into a sheet shape using cellulose acetate having a degree of acetyl substitution of 0.4 or more as a raw material.
  • the shape of the sheet may be any shape as long as it has a thin surface with a large area, and can be molded according to the application.
  • the sheet 21 can be used by being formed into a rectangular sheet having a length e, a width f, and a thickness g. The length e, width f, and thickness g can be appropriately adjusted depending on where the sheet 21 is applied as a plant cultivation medium.
  • the sheet 21 or the plant cultivation medium 20 (see FIG. 7) including the sheet 21 has a rectangular shape
  • the length e is 30 mm or more and the width f is 30 mm or more for ease of handling.
  • the width f is 5000 mm or less and the width f is 5000 mm or less.
  • the sheet 21 has a length e of 1000 mm or less, a width f of 1000 mm or less, a thickness g of 1000 ⁇ m or less, and a square or rectangular shape. preferable.
  • the thickness g is 10 ⁇ m or more.
  • the thickness g is 10 ⁇ m or more, it is easy to handle as the plant cultivation medium 20 .
  • the thickness g is less likely that problems will occur when it is used as the plant cultivation medium 20 .
  • the thickness g is less than 10 ⁇ m, the strength of the sheet 21 is insufficient when the sheet 21 is laid in a field, and there is a possibility that the sheet 21 may be damaged or cut during laying.
  • the thickness g of the sheet 21 is preferably 40 ⁇ m or more, more preferably 100 ⁇ m or more. A thickness of 100 ⁇ m or more is preferable because the sheet is resistant to tearing and can be handled flexibly.
  • the upper limit is preferably 10,000 ⁇ m or less for reasons such as ease of folding or cutting of the sheet.
  • the sheet 21 is preferably made of the fibrous material 12.
  • the sheet 21 can be a three-dimensional fiber structure. As shown in FIG. 5, when the sheet 21 is a three-dimensional fiber structure made up of fibrous materials 12, when one surface of the sheet 21 is partially enlarged, the fibrous materials 12 appear to be piled up. It can be seen that it is a three-dimensional structure. The fibrous material 12 will be described later. Also, the sheet 21 can be sponge-like. These three-dimensional fibrous structures or sponges are processed into desired shapes to form sheets 21 .
  • the sheet 21 can be, for example, roll-shaped for ease of handling when laying the plant cultivation medium 20 containing the same in a field. That is, the sheet 21 having a thickness of g and a width of h may be wound around a roll 22 to form a sheet having a shape to be laid in a field and used as the plant cultivation medium 20 .
  • the sheet 21 having a width e of 150 cm and a length of 100 m wound around a roll 22 can be laid.
  • the roll sheet 21 preferably has a width of 10 cm or more and a length of 5 m or more, and a length of 5000 cm or less and a length of 10000 m or less.
  • a single sheet 21 may be used as the plant cultivation medium 20, or a plurality of sheets may be used as the plant cultivation medium 20. When using more than one, they can be stacked and used.
  • Plant growing medium 20 comprises one or more sheets 21 .
  • the plant cultivation medium 20 including a plurality of sheets 21 makes it easy to control wasteful evaporation of water by changing the layered structure of the sheets, and is particularly useful for plant cultivation that requires water management.
  • the plant cultivation medium 20 including the sheet 21 can be used mainly as a plant cultivation medium for hydroponics.
  • the plant cultivation medium 20 includes one sheet 21 with a thickness g of about 100 ⁇ m.
  • a planter 23 is used to place the sheet 21 on a nutrient solution 24 to form a plant cultivation medium 20 .
  • the planter 23 is usually used in hydroponics, and has a width i of 20 cm.
  • a plant 13 is planted in the plant cultivation medium 20 .
  • the planter 23 extends in the depth direction of the paper, and the plants 13 are planted at intervals in this direction.
  • FIG. 7 shows a cross section in a plane perpendicular to the longitudinal direction, which is the depth direction of the paper. Note that soil may be used instead of the nutrient solution 24, and one or more sheets 21 may be placed on the soil.
  • a plant cultivation medium 20 in another embodiment includes a sheet 21 having a thickness g of about 100 ⁇ m.
  • a plurality of sheets 21 are stacked to form a rectangular parallelepiped having a length b of 20 cm, a width c of 90 cm, a height d of 0.1 cm, and a volume of about 180 cm 3 .
  • three plants 13 are grown at intervals.
  • a plant cultivation medium 20 in another embodiment includes blocks 11 and sheets 21 .
  • the block 11 has a cubic shape with a side a of about 3 cm and a volume of about 27 cm 3 .
  • the sheet 21 is formed by laminating a plurality of sheets 21 having a thickness g of about 100 ⁇ m to form a rectangular parallelepiped having a length b of 20 cm, a width c of 90 cm, a height d of 0.1 cm, and a volume of about 180 cm 3 .
  • three cubic blocks 11 are placed on a plurality of rectangular parallelepiped sheets 21 at intervals.
  • Three plants 13 are grown in a plant cultivation medium 20 in which blocks 11 and a plurality of rectangular sheets 21 are combined. planted directly.
  • the sheet 21 may be of any shape as long as it is sheet-like. Since the sheet 21 has a sheet shape, it is easy to handle. In addition, the plant cultivation medium 20 including the sheet 21 is also easy to handle due to the inclusion of the sheet 21, and plants particularly suitable for the sheet-shaped plant cultivation medium 20 can be cultivated satisfactorily. Moreover, since it is in the form of a sheet, by using it in combination with other types of sheets, it is possible to make the plant cultivation medium 20 suitable for various plants and the like. It may also be used by mixing with other types of plant cultivation media such as water, nutrient solution, soil, sand, rock wool, ceramic balls, coconut shells, or peat moss. Further, when the sheet 21 is rolled, it is easy to handle and lay when laying in a field.
  • the sheet 21 as described above can be manufactured by the following manufacturing method.
  • it can be produced by a casting method in which cellulose acetate having a degree of acetyl substitution of 0.4 or more is dissolved in a solvent to form a polymer solution, which is cast through a die and then dried, or by an electrospinning method.
  • the sheet 21 can be manufactured from the nonwoven fabric sheet by forming a nonwoven fabric sheet and heating the nonwoven fabric sheet.
  • the cellulose acetate granules 31 are formed into granules using cellulose acetate having a hardness of 0.4 or more as a raw material.
  • the shape of the granules as shown in FIG. 10, the shape of an independent spherical grain having a grain size j may be used, or as shown in FIG. It may have an irregular shape that does not have a fixed shape, for example, by connecting the granular portion 32 with fibers.
  • the size of the granules can be varied according to the application, but the average particle size is preferably 3 mm or more. It is more preferably 4 mm or more, and still more preferably 5 mm or more.
  • the upper limit is preferably 50 mm or less in order to prevent the size of the voids formed by the grains from becoming too large as compared to the roots of the plant.
  • the average particle size of the granules 31 is based on the value measured by the sieving method when the particles are independent grains.
  • the sieving method uses a test sieve described in JIS Z8801.
  • the diameter j of the granulated portions 32 of the granulated cotton is actually measured, and the average diameter is obtained by simple averaging.
  • the diameter j of the largest grain portion 32 in an independent grainy cotton can be actually measured and used as the average grain size.
  • the granules 31 are preferably composed of the fibrous material 12.
  • the granular material 31 can be a three-dimensional fibrous structure. As shown in FIG. 10, when the granules 31 are a three-dimensional fibrous structure made up of the fibrous materials 12, when one surface of the granules 31 is partially enlarged, the fibrous materials 12 are piled up. It can be seen that it is a three-dimensional structure. The fibrous material 12 will be described later. Also, the granular material 31 can be spongy. These three-dimensional fibrous structures or sponges can be made into granules 31 by processing them into desired shapes.
  • the plant cultivation medium 30 containing the granular material 31 can be used mainly as a plant cultivation medium for hydroponics.
  • the plant cultivation medium 30 consists of granular bodies 31.
  • a planter 33 is filled with the granules 31 to form a plant cultivation medium 30, and the plant 13 is hydroponic.
  • the granules 31 are filled in a planter 33 with a height k of 5 cm and a width l of 20 cm.
  • the planter 33 extends in the depth direction of the paper, and the plants 13 are planted at intervals in this direction.
  • FIG. 12 shows a cross section of the plant cultivation medium 30 taken along a plane perpendicular to the longitudinal direction, which is the depth direction of the paper.
  • the plant cultivation medium 30 is made of granular cotton 34.
  • the granular cotton 34 is spread with a height m of 5 cm and a width n of 90 cm, and three plants 13 are planted at intervals.
  • the plant cultivation medium 30 of the present embodiment extends in the depth direction of the paper, and the plants 13 are planted at regular intervals.
  • FIG. 13 shows a cross section of the plant cultivation medium 30 in a plane parallel to the plane of the paper.
  • the plant cultivation medium 30 containing the granules 31 with an average particle diameter of 3 mm or more is applicable to many plants, and is easy to handle such as seeding or repotting. In addition, plants cultivated using this have a high germination rate. Furthermore, after the plant cultivation medium 30 is used, it can be easily separated from plant roots and the like, and can be easily reused.
  • the granules 31 are easy to handle because they are granules.
  • the plant cultivation medium 30 containing the granular bodies 31 is also easy to handle because it contains a plurality of the granular bodies 31 as described above.
  • it can be easily used by mixing with other types of plant cultivation medium materials such as water, nutrient solution, soil, sand, rock wool, ceramic balls, coconut shells, or peat moss.
  • a plant can be cultivated satisfactorily by selection.
  • the plant cultivation medium 30 containing the granules 31 can be used by filling any form of space, and is particularly useful for replacing conventional soil cultivation. Therefore, it can be usefully used for hydroponics, particularly solid medium cultivation.
  • the granules 31 as described above can be manufactured by the following manufacturing method.
  • the granules 31 are in the form of independent granules, they are produced by cutting or pulverizing the block 11, or by cutting filaments made of cellulose acetate.
  • the granules 31 are in the form of granulated cotton, a method of randomly entangling fibers produced by a wet spinning method using a polymer solution, a dry spinning method, an electrospinning method, or the like, and molding into granules can be used.
  • the amount of fibers forming the granules and the diameter of the fibers the granules 31 as described above can be produced.
  • Each of the blocks 11, the sheets 21, or the granular bodies 31 made of cellulose acetate having a degree of acetyl substitution of 0.4 or more contained in the plant cultivation media 10, 20, and 30 has a porosity higher than 66.6%. is preferred.
  • the porosity refers to the volume ratio of air contained relative to the total volume of each block 11, sheet 21, or granular material 31, and is a value (unit: %) obtained by the following method.
  • the medium 40 for plant cultivation when not distinguishing the medium 10, 20, and 30 for plant cultivation below, it is called the medium 40 for plant cultivation.
  • the plant cultivating medium 40 containing blocks 11, sheets 21, or granular bodies 31 with a porosity higher than 66.6% preferably has air permeability or water permeability, etc., and can sufficiently absorb water and air necessary for cultivating plants. It can be given to plants for a long time and is also excellent in water and air circulation.
  • the porosity is more preferably 75% or more, still more preferably 85% or more, and particularly preferably 90% or more. When the porosity is 90% or more, air permeability or water permeability is more preferable, and even plants that require more water, air, or oxygen, for example, can be suitably cultivated.
  • the porosity is higher than 66.6%, the block 11, the sheet 21, or the granules 31 has an appropriate mass, is easy to handle, and is suitable as the medium 40 for plant cultivation.
  • the porosity (unit is %) is defined by setting the mass of the block 11 to W (unit is g), the volume to V (unit is cm 3 ), and the specific gravity of cellulose acetate to ⁇ 1 (unit is g/ cm3), it can be obtained by [1 ⁇ (W/V)/ ⁇ 1] ⁇ 100.
  • the basis weight of the sheet 21 is W (unit is g/m 2 ), the thickness is H (unit is mm), and the specific gravity of the fibers constituting the sheet 21 is ⁇ 1 ( When the unit is kg/m 3 ), it can be obtained by [1 ⁇ (W/1000)/(H/1000) ⁇ / ⁇ 1] ⁇ 100.
  • the weight W is obtained by cutting the sheet 21 into 5 cm ⁇ 5 cm, measuring the mass with an electronic balance (manufactured by Mettler Toledo, Inc.), and converting the measured value into 1 m 2 .
  • the thickness H is a value measured by a non-contact laser displacement meter (LK-H025 manufactured by Keyence Corporation) in this embodiment.
  • the porosity of the granular material 31 it can be measured by a method called a buoyancy method or a suspension method. Specifically, after measuring the weight WA (unit: g) of the granules 31 in the atmosphere, the weight WB (unit: g) in the replacement liquid was measured, and the specific gravity of cellulose acetate was determined as ⁇ (unit: g/cm 3 ), the density of air is ⁇ AIR (unit is g/cm 3 ), and the density of the replacement liquid is ⁇ 0 (unit is g/cm 3 ), [1-((WA/(WA-WB )) ⁇ ( ⁇ 0 ⁇ AIR)+ ⁇ AIR)/ ⁇ 1] ⁇ 100.
  • a block 11, a sheet 21, or a granule 31 having a porosity higher than 66.6% can be manufactured by being composed of the fibrous material 12 of cellulose acetate.
  • the fibrous material a nonwoven fabric of fibers or a three-dimensional fiber structure can be adopted.
  • the block 11 uses a three-dimensional fiber structure
  • the sheet 21 uses a nonwoven fabric of fibers obtained by a phase separation method, an electrospinning method, a wet spinning method, or the like
  • the granules 31 uses a three-dimensional fiber structure.
  • a method of pulverizing into granules can be adopted.
  • the porosity of the manufactured nonwoven fabric can be adjusted, and this nonwoven fabric can be used as the sheet 21 .
  • the granules 31 with a controlled porosity can be obtained by randomly entangling the obtained fibers and molding them into granules. granules 31 can be manufactured.
  • the block 11 , the sheet 21 , or the granular material 31 is preferably composed of the fibrous material 12 .
  • the fibrous material 12 is preferably a fiber having a fiber diameter of 0.1 ⁇ m to 5000 ⁇ m or a non-woven fabric made of this fiber.
  • the fiber or nonwoven fabric having a fiber diameter of 0.1 ⁇ m to 5000 ⁇ m may be produced by any method, but is preferably a fiber produced by an electrospinning method, a wet spinning method, or a dry spinning method, or a nonwoven fabric made of this fiber. .
  • a solution in which cellulose acetate is dissolved in a solvent is spouted toward a collector to form fibers, and the spouted fibers are collected to form a nonwoven fabric composed of a large number of fibers.
  • the porosity of the nonwoven fabric can be adjusted by adjusting the composition of the solution, the ejection amount of the fibers, or the conveying speed of the collector, and the porosity of the block 11, the sheet 21, or the granular material 31 can be adjusted. can do. Therefore, a fibrous material 12 manufactured by an electrospinning method can be used.
  • a solution in which cellulose acetate is dissolved in a solvent is discharged from a nozzle, taken up in a poor solvent, and wound by a collector to collect fibers.
  • the fiber diameter can be adjusted by adjusting the composition of the solution, the discharge amount of the fiber, the conveying speed of the collector, or the like.
  • the obtained fibers can be made into a nonwoven fabric by, for example, a needle punching method or a hydroentangling method.
  • the porosity of the block 11, the sheet 21, the granular material 31, or the like can be adjusted. Therefore, it is preferred to manufacture the fibrous material 12 by a wet spinning method.
  • the plant cultivation medium 40 containing the blocks 11, the sheets 21, or the granules 31 made of cellulose acetate having a degree of acetyl substitution of 0.4 or more does not contain other components and has a degree of acetyl substitution of 0.
  • the plant cultivation medium 40 can be made of only the block 11, the sheet 21, or the granules 31 made of cellulose acetate of .4 or more.
  • the plant cultivation medium 40 includes blocks 11, sheets 21, or granules 31 made of cellulose acetate.
  • the plant cultivation medium 40 may contain a plurality of types of each of the blocks 11 , the sheets 21 , or the granular bodies 31 , or one type may be used as the plant cultivation medium 40 .
  • one type is used, for example, in the case of block 11, the block has a shape suitable for planting plants, and the block can be used as a plant cultivation medium without changing its shape.
  • different types of blocks 11 can be combined to form a plant cultivation medium (see FIG. 4), or a large number of the same type of granular bodies 31 can be used to form a plant cultivation medium.
  • the block 11 and the sheet 21 can be combined to form a plant culture medium (see FIG. 9).
  • the sheet 21 it may be used as a single sheet, or a plurality of sheets may be stacked to form the plant cultivation medium 40 .
  • the plant cultivation medium 40 containing the blocks 11, the sheets 21, or the granules 31 made of cellulose acetate having a degree of acetyl substitution of 0.4 or more can be used as the plant cultivation medium 40. It may contain other ingredients.
  • the sheet 21, or the granules 31, water or a nutrient solution may be contained, or soil, sand, rock wool, coconut shell, peat moss, or the like may be contained.
  • the content of the block 11, the sheet 21, or the granular material 31 is preferably 70% by weight or more, preferably 80% or more, relative to the total mass of the plant cultivation medium 40. is more preferable, and 90% or more is even more preferable. If the content of the blocks 11, the sheet 21, or the particles 31 is less than 70% by weight, the effects of the blocks 11, the sheets 21, or the particles 31 may not be sufficiently exhibited.
  • the plant cultivation medium 40 can be suitably used, for example, as a medium for hydroponics or solid medium cultivation using a nutrient solution. It can also be used as a medium for cultivation using soil, but in the case of soil, if there is a risk of problems such as contamination, it is used as a medium for cultivation using a nutrient solution. At least one selected from blocks 11, sheets 21, and granules 31 can be used according to the form of hydroponics. Moreover, it can be suitably used as part of the culture medium used for hydroponics. For example, in deep flow technique (DFT) or nutrient film technique (NFT), which is a method of hydroponics, block 11, sheet 21, or granular material 31 can be preferably used (see FIG. 14).
  • DFT deep flow technique
  • NFT nutrient film technique
  • the plant cultivation medium 40 does not contain components that pose problems for plants and does not absorb nutrients necessary for plant growth, so it can be suitably used for various plants.
  • vegetables such as tomatoes, eggplants, and peppers, flowers, fruits, grains, and other commonly cultivated plants can be used without particular limitation.
  • the plant cultivation medium 40 containing at least one of the blocks 11, the sheet 21, and the granules 31 made of cellulose acetate with a degree of acetyl substitution of 0.4 or more can be easily reused after use.
  • a recycling method there is a dissolution step of obtaining a cellulose acetate solution by dissolving the plant cultivation medium 40 with an organic solvent, and at least one of the block 11, the sheet 21, and the granular material 31 using the cellulose acetate solution. and a forming step of forming one.
  • the used plant cultivation medium 40 For the used plant cultivation medium 40, first, it is preferable to remove things other than the blocks 11, the sheets 21, or the granular bodies 31, such as plant roots. If the removal is troublesome, the organic solvent may be allowed to act on the used plant cultivation medium 40 containing plant roots and the like in the dissolution step.
  • the used plant cultivation medium 40 contains at least one of the blocks 11, the sheets 21, and the granules 31 made of cellulose acetate having a degree of acetyl substitution of 0.4 or more
  • the used plant cultivation medium By allowing an organic solvent to act on 40, a cellulose acetate solution in which cellulose acetate is dissolved in the organic solvent can be obtained. Therefore, cellulose acetate can be easily recovered, and reuse of the plant cultivation medium 40 is facilitated.
  • cellulose acetate is biodegradable to finally decompose into water and carbon dioxide, even when the plant cultivation medium 40 is discarded, it can be discarded as it is, and the disposal is easy.
  • the organic solvent used in the dissolving step includes dichloromethane, chloroform, or acetone. Dichloromethane is preferred because it is flame retardant.
  • the cellulose acetate dissolved matter obtained in the dissolving step can be used as a raw material for manufacturing the block 11, the sheet 21, and the granules 31 by performing a filtering treatment or the like.
  • the forming step at least one of the blocks 11, the sheets 21, and the granules 31 is formed using the cellulose acetate melt.
  • the forming method can be the same method as in the case of using a cellulose acetate solution that is not a reusable product.
  • a method for reusing a plant cultivation medium 40 containing at least one of blocks 11, sheets 21, and granules 31, each made of cellulose acetate having a degree of acetyl substitution of 0.4 or more comprises a dissolving step and a forming step. Afterwards, a plant cultivation medium production step may be included.
  • the plant cultivation medium manufacturing process manufactures the plant cultivation medium 40 including at least one of the blocks 11, the sheets 21, and the granules 31 respectively formed in the forming process.
  • Blocks 11, sheets 21, granules 31, or plant cultivation medium 40 are the same as described above.
  • the structure of the blocks 11, the sheets 21, or the granular bodies 31 similar to those used in the plant cultivation medium 40 before use can be easily produced. , and can be manufactured practically.
  • a block 11 and a sheet 21 were manufactured using a nonwoven fabric 58 manufactured by a wet spinning method.
  • Cellulose Acetate Propionate and Cellulose Acetate Butyrate from EASTMAN CHEMICAL were used as raw material cellulose acetate polymers.
  • the concentration of cellulose acetate polymer in the wet spinning method was 8% by weight. This concentration is determined by ⁇ M1/(M1+M2) ⁇ 100, where M1 is the mass of the cellulose acetate polymer and M2 is the mass of the solvent 26 . Also, the degree of acetyl substitution was adjusted by hydrolysis of cellulose acetate.
  • the obtained nonwoven fabric 58 was cut with a cutter to create a 30 mm square, substantially cubic block 11 and a 14 mm square, substantially cubic block 11 .
  • the obtained non-woven fabric 58 is heat-treated to adjust the thickness to 300 ⁇ m (0.3 mm), cut with a cutter into a substantially square of 30 mm long and 30 mm wide, and then hot press to reduce the thickness. It was adjusted to form a sheet 21 made of a fibrous material.
  • the sheet 21 was manufactured by the casting method by drying after casting the cellulose acetate polymer from a solution die.
  • the obtained sheet 21 was cut with a cutter into a substantially square of 30 mm long and 30 mm wide, and then hot pressed to adjust the thickness.
  • This sheet 21 is in the form of a film, and the sheet 21 is in the form of a film.
  • the granules 31 were obtained by randomly intertwining the fibers obtained by the above wet spinning method and molding them into granules.
  • the granules 31 had a shape of generally independent granules, an average particle diameter measured by the above measuring method was 3 mm or more, and a simple average value of volume was 0.03 ml.
  • Example 1 Example 2, Example 4
  • Tomatoes (variety: Momotaro York (registered trademark)) were cultivated using the obtained block 11 in the same manner as described in FIG.
  • the substantially cubic block 11 of 30 mm square obtained in the production example was used in the first and fourth examples.
  • a substantially cubic block 11 of 14 mm square was used in the second embodiment.
  • the blocks 11 were installed so as to fit into the holes formed in the tray 41, and these were installed on the nutrient solution 24 to form a plant cultivation medium 50 for hydroponics.
  • a planter 42 was used, and blocks 11 having the shapes shown in Table 1 were used.
  • the planter 42 was used in hydroponics and had a width o of 90 cm.
  • FIG. 14 shows a cross section in a plane perpendicular to the longitudinal direction, which is the depth direction of the paper.
  • blocks 11 having the degree of acetyl substitution, volume (ml), shape, and porosity listed in Table 1 were used, respectively.
  • "-" is entered in the thickness column.
  • Example 3 Example 5, Example 6
  • a plant cultivation medium 20 similar to that described in FIG. gone.
  • Example 3 Example 5, and Example 6, the sheet 21 having a thickness of 300 ⁇ m was adjusted to have the thickness shown in Table 1 to prepare the sheet 21 .
  • "-" is entered in the volume column.
  • Example 7 A plant cultivation medium 20 similar to that shown in FIG. 7 was prepared using one film-like sheet 21 obtained in Production Example, and tomatoes similar to those in Example 1 were grown.
  • the film-like sheet 21 was adjusted to have the thickness shown in Table 1 to prepare the film-like sheet 21 .
  • the sheet 21 having the degree of acetyl substitution, thickness ( ⁇ m), shape and porosity shown in Table 1 was used.
  • “-" is entered in the volume column.
  • the film-like sheet is not composed of fibrous material, it is described as "not composed of fibrous material” in the shape column of Table 1.
  • Example 8 A plant cultivation medium 30 similar to that described in FIG.
  • the planter 33 was filled with the granules 31 to form the plant cultivation medium 30, and solid medium cultivation was performed.
  • the granules 31 were filled in a planter 33 with a height k of 5 cm and a width l of 20 cm.
  • the sheet 21 having the degree of acetyl substitution, volume (ml), shape and porosity shown in Table 1 was used.
  • "-" is entered in the thickness column.
  • Cultivation details are as follows. Tomato seeds were sown on 100 cultivation media sufficiently saturated with pure water, and stored in the dark for 3 days at a temperature of 28° C. and a relative humidity of 70%. After germination of tomato seeds was confirmed, seedlings were raised for 30 days. As a liquid fertilizer, Home Hyponica manufactured by Kyowa Co., Ltd. diluted 500 times with pure water was used, and the liquid was supplied twice a day. A white LED (PGL-NE-200NWD) manufactured by Ryoden Corporation was used as a light source during the seedling raising period, and the light intensity was set to 250 ⁇ mol/m 2 ⁇ s, and irradiation was performed from above. Cultivation conditions were as follows.
  • the degree of acetylation of block 11 or sheet 21 is shown in Table 1 as values determined according to the measurement and calculation of the degree of acetylation in ASTM D871-96 (2019) (Standard Test Methods of Testing Cellulose Acetate). Table 1 shows the porosity measured by the method described above for each of the block 11, the sheet 21, and the granular material 31.
  • Germination rate The germination rate was obtained by counting the number of seeds that germinated. That is, the germination rate was defined as the number of germination per 100 seeds.
  • Bud setting rate The bud setting rate at 30 days after sowing the tomato seeds was measured by visually counting the number of strains with buds and dividing the number by the sown number.
  • Recyclability and recycling recovery rate Solubility in an organic solvent and whether or not the polymer solution after dissolution can be used to form the same structure was evaluated as recyclability according to the following criteria.
  • the mass ratio of the same structure obtained after recycling is calculated based on the mass of each of the blocks 11, the sheet 21, or the granular material 31 used in the plant cultivation medium as a reference (100), and the recycling recovery rate is obtained. , was evaluated according to the following criteria.
  • the medium after cultivation was soluble in a solvent, and the formation of the same structure was possible. No: The medium after cultivation was soluble in a solvent, and the formation of the same structure was not possible.
  • Example 1 Tomatoes were cultivated in the same manner as in Example 1, using only the sponge as the plant cultivation medium 10 .
  • the sponge was used by molding a medium for fruits and vegetables manufactured by Kyowa Co., Ltd. with a cutter.
  • the sponge volume, shape and porosity are shown in Table 1.
  • the porosity was measured in the same manner as in Block 11.
  • Tomato seeds were planted in the center of the sponge.
  • the cultivation environment and the like are the same as those in the first embodiment.
  • the evaluation results are shown in Table 1.
  • Example 2 Tomatoes were cultivated in the same manner as in Example 1 except that only rock wool was used as the plant cultivation medium 10 .
  • rock wool Yasaihana Pot manufactured by Nippon Rock Wool Co., Ltd. was used.
  • the rock wool volume, shape and porosity are shown in Table 1.
  • the porosity was measured in the same manner as in Block 11.
  • Tomato seeds were planted in the center of the rockwool.
  • the cultivation environment and the like are the same as those in the first embodiment. The evaluation results are shown in Table 1.
  • Sheet 21 was produced in the same manner as in Example 3, except that the degree of acetyl substitution was adjusted as shown in Table 1 by hydrolysis. The thickness, shape and porosity of the sheet 21 are shown in Table 1. The porosity was measured in the same manner as for the sheet 21 . Tomatoes were grown in the same manner as in Example 3. The evaluation results are shown in Table 1. In Comparative Example 3, the sheet decomposed during cultivation and could no longer support the plants. Therefore, "-" was entered in the columns for the bud set rate and the recycling recovery rate, and "No (sheet decomposition)" was entered in the column for whether or not recyclability is possible.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Cultivation Of Plants (AREA)

Abstract

L'invention concerne un milieu de culture de plante facilement réutilisable et un procédé de réutilisation du milieu de culture de plante.　Le milieu de culture de plante (10, 20, 30, 40, 50) comprend un bloc d'acétate de cellulose (11), une feuille d'acétate de cellulose (21) ou un matériau granulaire d'acétate de cellulose (31), chacun composé d'acétate de cellulose ayant un degré de substitution d'acétyle de 0,4 ou plus. Le procédé de réutilisation du milieu de culture de plante (10, 20, 30, 40, 50) comprend : une étape de dissolution consistant à dissoudre le milieu de culture de plante usagé (10, 20, 30, 40, 50) par l'utilisation d'un solvant organique pour obtenir un produit de dissolution de l'acétate de cellulose ; et une étape de façonnage consistant à façonner le milieu de culture de plante (10, 20, 30, 40, 50) en mettant en œuvre le produit de dissolution de l'acétate de cellulose.
PCT/JP2022/009713 2021-03-15 2022-03-07 Milieu de culture de plante et procédé de réutilisation de milieu de culture de plante WO2022196413A1 (fr)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6156023A (ja) * 1984-08-27 1986-03-20 ダイセル化学工業株式会社 園芸用培養土
JPS63207325A (ja) * 1987-02-24 1988-08-26 帝人株式会社 人造土壌
JPH05260859A (ja) * 1992-03-18 1993-10-12 Teijin Ltd 種苗用育成シート
JPH06212510A (ja) * 1992-10-27 1994-08-02 Teijin Ltd 生分解性の調節されたセルロースアセテート繊維及びその製造方法、並びに該繊維から形成された苗栽培容器及び緑化用シート
JPH10201379A (ja) * 1997-01-25 1998-08-04 Saburo Ike 田植機用苗床
JPH1156096A (ja) * 1997-08-22 1999-03-02 Chuko Kasei Kogyo Kk 水辺・湿地用緑化培養資材
JPH11155385A (ja) * 1997-11-26 1999-06-15 Mitsubishi Agricult Mach Co Ltd 育苗用の苗マット構造
JP2002238346A (ja) * 2001-02-14 2002-08-27 Nippon Plant Shiidaa Kk 植栽用土壌改良材および植栽方法
US20210045299A1 (en) * 2019-08-14 2021-02-18 Doug Ranno Plant growth media compositions and production processes thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6156023A (ja) * 1984-08-27 1986-03-20 ダイセル化学工業株式会社 園芸用培養土
JPS63207325A (ja) * 1987-02-24 1988-08-26 帝人株式会社 人造土壌
JPH05260859A (ja) * 1992-03-18 1993-10-12 Teijin Ltd 種苗用育成シート
JPH06212510A (ja) * 1992-10-27 1994-08-02 Teijin Ltd 生分解性の調節されたセルロースアセテート繊維及びその製造方法、並びに該繊維から形成された苗栽培容器及び緑化用シート
JPH10201379A (ja) * 1997-01-25 1998-08-04 Saburo Ike 田植機用苗床
JPH1156096A (ja) * 1997-08-22 1999-03-02 Chuko Kasei Kogyo Kk 水辺・湿地用緑化培養資材
JPH11155385A (ja) * 1997-11-26 1999-06-15 Mitsubishi Agricult Mach Co Ltd 育苗用の苗マット構造
JP2002238346A (ja) * 2001-02-14 2002-08-27 Nippon Plant Shiidaa Kk 植栽用土壌改良材および植栽方法
US20210045299A1 (en) * 2019-08-14 2021-02-18 Doug Ranno Plant growth media compositions and production processes thereof

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