JP2001161164A - Paste agent for culturing soil for growing seedling and culturing soil for growing seedling using the same agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paste agent for a culturing soil for growing seedlings, capable of maintaining a good solidifying state stably without being affected directly by the property of a base material of the culturing soil for growing the seedlings and also excellent in sowing work efficiency and preserving property, and a culturing soil for growing the seedling using the same agent. SOLUTION: This paste agent for the culturing soil for growing the seedlings consists of a starch and a copolymer obtained by polymerizing monomer components containing a monomer having addition polymerizable double bond. As the above monomer having the addition polymerizable double bond, a (meth) acrylic acid (salt) is suitable. The culturing soil for growing the seedlings is obtained by mixing the above paste agent and the base material for the culturing soil for growing the seedlings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sizing agent for cultivating seedlings, which is preferably used for mechanical transplantation of agricultural and horticultural crops, and to a cultivating seedlings using the same.

[0002]

2. Description of the Related Art Conventionally, mechanical transplantation of agricultural, horticultural crops such as vegetables, flowers, paddy rice, etc. has been actively carried out for the purpose of increasing the efficiency of agricultural and horticultural work. In general, mechanical transplantation involves raising a seeded seedling in a seedling container (a seedling pot) having a shape such as a pot shape, and subsequently separating the seeded seedling from the seedling pot by, for example, pushing out the seedling with a transplanter. After that, it is carried out by the procedure of planting in ridges.

[0003] As described above, in order to improve the efficiency of agricultural and horticultural work, mechanical transplantation is used to fill the above-mentioned seedlings, ie, seedlings, and seedling pots for growing the seedlings, and use the roots of the seedlings. The wrapped seedling cultivation soil (hereinafter referred to as “root bowl part”) has a work process in which both are planted on the ridges by the transplanter. In the case of performing the above-described protrusion, for example, the soil-bearing seedling is protruded by a protruding rod provided in the transplanter so as to be able to penetrate a hole formed in the bottom of the seedling raising pot.

[0004] Therefore, in order for the mechanical transplantation to be performed smoothly by the above procedure, the root pot portion has an appropriate elasticity, whereby the soild seedling is easily protruded from the seedling raising pot without collapse. It is necessary that the properties, that is, the removability from the seedling raising pot be good. On the other hand, in order for the agricultural and horticultural crops to be mechanically transplanted to grow smoothly especially in the rhizosphere, the above-mentioned root pot must have a moderate elasticity.

Therefore, conventionally, various methods have been used in which a paste for raising seedlings made of a polymer or the like having an anionic group in the molecule is contained in the raising seedlings and the seedlings are solidified. For example, JP-A-59-59119, JP-B-3-49525, JP-A-3-210124, JP-A-5-292833, JP-A-8-564.
No. 80, JP-A-8-172900 and the like are known. The solidification methods described in these publications are:
In each case, the cations in the seedling cultivation soil base material react with the above-mentioned anionic groups in the paste for breeding soil cultivation to be added, thereby solidifying the seedling growth soil base material.

For example, Japanese Patent Publication No. 3-49525 discloses a seedling culture medium containing an acrylamide / sodium acrylate copolymer containing a predetermined ratio of repeating units derived from sodium acrylate. In this seedling cultivation soil, sodium ions generated by ionization of sodium acrylate are replaced with polyvalent metal ions (polyvalent cations) such as aluminum ions contained in the soil as a seedling cultivation base material. A new ionic bond is formed between the seedling cultivation soil and the paste for raising seedlings, and the solidification reaction is carried out by crosslinking the seedling cultivation base materials with the paste for raising seedlings.

[0007]

However, the conventional seedling cultivation soil is solidified by the reaction of the cations in the seedling cultivation base material with the anionic groups of the paste for the seedling cultivation soil. There is a problem that the solidification property is not stable depending on the cation content and seedling raising conditions.

In particular, substances containing almost no cations, such as peat moss (white peat moss from Canada, Finland, Sweden, etc.), vermiculite (from South Africa, China, etc.), perlite, coconut husk, bark, etc. are disclosed in these publications. The described paste for cultivating seedlings cannot be solidified at all.

When the paste described in the above publication is mixed in advance with the seedling cultivation soil base material, it reacts with cations via water in the seedling cultivation soil base material during storage, so that the preservability of the seedling growth soil is reduced. It becomes extremely low and causes problems such as poor solidification of the seedling culture.

On the other hand, as a solidifying method other than the above, for example, a method using a paste having relatively high tackiness, as described in Japanese Patent Application Laid-Open No. 62-236416, is known. However, this method has a problem that the adhesiveness of the seedling culture is too high depending on the amount of the paste added, and the workability in filling the seedling culture with the seedling culture pot, that is, the seeding workability is reduced. are doing.

Also, a method of solidifying the soil by adding a fibrous substance to the soil as described in, for example, Japanese Patent Application Laid-Open No. 9-9859 is known. However, this method has problems that the cost is high and the solidification of the soil is not stable.

The present invention has been made to solve the above problems, and an object of the present invention is to be able to stably maintain a good solidified state without being directly affected by the properties of a seedling culture substrate. Another object of the present invention is to provide a paste for cultivating seedling cultivation excellent in sowing workability and preservability, and a cultivating seedling cultivation using the same.

[0013]

The present inventors have intensively studied to solve the above problems. as a result,
A copolymer obtained by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond such as an acrylate salt is frequently contained in soil as a base material for raising seedlings. The present inventors have found that the soil can be solidified stably without depending on the solidification reaction based on the ionic bond with a valent cation or the like, and have completed the present invention.

According to a first aspect of the present invention, there is provided a sizing agent for raising seedlings, comprising a polymer obtained by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond. It is characterized by being composed of a polymer.

According to the above construction, the copolymer is mainly formed by polymerizing a monomer component containing a starch and a monomer having an addition-polymerizable double bond, whereby the starch is mainly adhered to the starch. Adsorption property derived from the property can be exhibited moderately. Therefore, the seedling cultivation soil base material and the like can be solidified by the adsorptivity. That is, since the solidification using the above-mentioned copolymer does not depend on the mechanism of solidifying the seedling culture substrate by ionic bonding with the polyvalent cation in the seedling culture substrate, it is directly affected by the properties of the seedling culture substrate. Therefore, a good solidified state can be stably maintained. Therefore, for example, it is possible to solidify a seedling cultivation soil base mainly composed of peat moss or vermiculite, which hardly contains polyvalent cations and the like. Also,
Unlike the case where the seedling culture medium is solidified by ionic bonding, the solidification reaction does not occur excessively, so that the storage stability is excellent. Furthermore, according to the above configuration, unlike the case where only starch is used, excessive stickiness does not occur in the seedling culture. Therefore, it is possible to provide a sizing agent for raising seedlings, which is excellent in sowing workability.

According to a second aspect of the present invention, there is provided a sizing agent for raising seedlings, wherein the monomer having an addition polymerizable double bond is (meth) It is characterized by being acrylic acid (salt).

According to a third aspect of the present invention, in order to solve the above-mentioned problems, in addition to the constitution of the first or second aspect, the copolymer has a crosslinked structure. And

[0018] According to the above structure, since the copolymer has the above structure, it can have more appropriate tackiness, so that the paste for raising seedling culture soil can stably maintain a better solidified state. An agent can be provided.

According to a fourth aspect of the present invention, there is provided a sizing agent for raising seedlings, in addition to the constitution according to any one of the first to third aspects, wherein the starch and the addition-polymerizable sizing agent are added. The ratio of the monomer having a heavy bond to the starch is in the range of 10 to 2,000 parts by weight with respect to 100 parts by weight of the starch.

According to the above configuration, when the above ratio is within the above range, the copolymer can exhibit more appropriate tackiness, so that a more excellent solidified state can be stably maintained. It is possible to provide a paste for raising seedlings that can be maintained.

According to a fifth aspect of the present invention, there is provided a seedling cultivation soil comprising a mixture of the paste for cultivating seedling cultivation according to any one of the first to fourth aspects and a seedling cultivation base material. It is characterized by:

According to the above arrangement, the sizing agent for growing seedlings is mainly made of starch by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond. The adsorbability originating from the can be appropriately exhibited. Therefore,
Due to the adsorptivity, the seedling raising substrate can be solidified. That is, since the solidification using the above-mentioned copolymer does not depend on the mechanism of solidifying the seedling culture substrate by ionic bonding with the polyvalent cation in the seedling culture substrate, it is directly affected by the properties of the seedling culture substrate. Therefore, a good solidified state can be stably maintained. Moreover, since the seedling cultivation base material is solidified by the above-mentioned adsorptivity and does not undergo an excessive solidification reaction as in the case of solidification by ionic bonding, a seedling cultivation soil excellent in preservability can be obtained. Further, according to the above configuration, unlike the case where only starch is used, excessive stickiness does not occur in the seedling culture. Therefore, it is possible to provide seedling cultivation soil excellent in sowing workability.

According to a sixth aspect of the present invention, in order to solve the above-mentioned problem, in addition to the constitution of the fifth aspect, the ratio of the paste for the seedling cultivation to the seedling cultivation is 1 to 5% by weight. Is within the range.

[0024] According to the above configuration, since the sizing agent for seedling cultivation is mixed within the above range, a better solidified state can be stably maintained, and the seeding workability and the preservability are excellent. Seedling cultivation soil can be provided.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The contents of the present invention will be described in detail below. The sizing agent for growing seedlings of the present invention comprises a copolymer obtained by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond. The seedling cultivation soil of the present invention is obtained by mixing the above-mentioned paste for seedling cultivation soil, which is a binder, with the seedling cultivation soil base material.

The starch used in the paste for cultivating seedlings of the present invention is not particularly limited, and specific examples thereof include raw starch such as sweet potato starch, potato starch, wheat starch, corn starch, rice starch, tapioca starch and the like. Such as pregelatinized starch (gelled starch), oxidized starch, dialdehyded starch, alkyl etherified starch, allyl etherified starch, oxyalkylated starch, aminoethyl etherified starch, cyanoethyl etherified starch, carboxymethylated starch, and the like. Modified starch; and the like. The sizing agent for raising seedlings according to the present invention is not particularly limited as long as it is a copolymer obtained by polymerizing a monomer component containing the starch and a monomer having an addition-polymerizable double bond.

Specific examples of the monomer having an addition polymerizable double bond include monomers having a carboxyl group such as (meth) acrylic acid and maleic anhydride; sodium (meth) acrylate Alkali metal salts of the above-exemplified monomers; alkaline earth metal salts of the above-exemplified monomers; trimethylamine (meth) acrylate, triethanolamine (meth) acrylate (salt) Monomers having a carboxylate such as methylamine and methylamine maleate; monomers having a sulfonic acid group such as vinylsulfonic acid, vinyltoluenesulfonic acid and sulfopropyl (meth) acrylate; vinylsulfonic acid sodium salt , Methylamine salt of vinylsulfonic acid, sodium salt of sulfopropyl (meth) acrylate, sulfopropyldi (meth) acrylate Monomers having a sulfonic acid salt such as a tanolamine salt; monomers having a hydroxyl group such as hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate; ethylene glycol monomethyl ether (meth) acrylate; Monomers having an ether group, such as trioxyethylene glycol (meth) acrylate; monomers having an amino group, such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate; N, N Monomers having an amide group, such as -di-n-propylacrylamide, N-hexylacrylamide, (meth) acrylamide, N-vinylpyrrolidone, N-methylolated acrylamide, N, N-dimethylacrylamide; N-trimethyl-N-
Monomers having a quaternary ammonium base, such as (meth) acryloyloxyethylammonium chloride and N, N, N-triethyl-N- (meth) acryloyloxyethylammonium chloride; methyl (meth) acrylate, (meth) A monomer having an ester bond, such as ethyl acrylate, 2-ethylhexyl (meth) acrylate, and vinyl acetate; a monomer having a nitrile group, such as (meth) acrylonitrile; The above exemplified monomers may be used alone or in combination of two or more.

Among the monomers exemplified above, a monomer having a carboxyl group, a (meth) acrylate such as sodium (meth) acrylate, a monomer having a carboxylate,
It is more preferable to use a monomer having a quaternary ammonium base, more preferably (meth) acrylic acid (salt), and particularly preferably to use sodium (meth) acrylate.

Further, when a monomer having an amide group, a monomer having an ester bond, or a monomer having a nitrile group is used as the monomer component according to the present invention, After polymerization of the monomer component, it is more preferable to impart water solubility to the copolymer by hydrolyzing as necessary.

The copolymer constituting the sizing agent for growing seedlings according to the present invention may have a crosslinked structure, if necessary. The crosslinking agent as a monomer component used to obtain a copolymer having a crosslinked structure is not particularly limited, for example, ethylene glycol, trimethylolpropane, glycerin, polyoxyethylene glycol, polyoxypropylene glycol and the like Diols of polyols
Or tri- (meth) acrylic esters; unsaturated polyesters obtained by reacting the polyols with unsaturated carboxylic acids such as maleic acid; bisacrylamides such as N, N-methylene-bisacrylamide; polyepoxides Di- or tri- (meth) acrylic acid esters obtained by reacting with (meth) acrylic acid; polyisocyanate such as tolylene diisocyanate, hexamethylene diisocyanate and hydroxyethyl (meth) acrylate Di- (meth) acrylic acid carbamyl esters obtained by the reaction; allylated starch; allylated cellulose; bifunctional compounds such as methylolated (meth) acrylamide, glyoxal, phthalic acid, adipic acid, and ethylene glycol; calcium oxide , Zinc acetate, etc. Salt; and the like.

Incidentally, for example, styrene, ethylene, propylene, butene, etc., which can react with the above-exemplified starch, monomer and the above-mentioned cross-linking agent, are contained as necessary as other monomer components. May be.

The ratio of the starch, the monomer having an addition-polymerizable double bond, and the crosslinking agent used as required is not particularly limited. When the monomer having an addition polymerizable double bond is 10
More preferably, the amount of the crosslinking agent is within the range of 0 to 10 parts by weight.

The method of polymerizing the above-mentioned starch and the monomer having an addition-polymerizable double bond, and optionally the above-mentioned crosslinking agent, may be any conventionally known method and is not particularly limited. As the polymerization method, specifically, for example, a method of irradiating radiation, an electron beam, ultraviolet light, or the like; ceric salt, hydrogen peroxide, benzoyl peroxide, azobisisobutyronitrile, azobisvaleric acid, azobis Polymerization using a radical polymerization catalyst such as isovaleric acid and ammonium persulfate; and the like.

Among the polymerization methods exemplified above, the polymerization method using radiation or electron beam irradiation and the polymerization method using a ceric salt catalyst or a hydrogen peroxide catalyst increase the graft polymerization rate. It is preferable because excellent solidification properties can be obtained.

If necessary, a polymerization solvent such as water, methanol, ethanol, acetone, N,
N-dimethylformamide, dimethyl sulfoxide and mixtures thereof may be used.

The polymerization temperature of the monomer component is not particularly limited. For example, when the polymerization is carried out using the above-mentioned various polymerization catalysts, it depends on the type of the polymerization catalyst used.
The temperature is more preferably in the range of 0 ° C, and further preferably in the range of 20 to 100 ° C.

The above-mentioned crosslinking method using a crosslinking agent is a method in which polymerization is carried out in a state in which a crosslinking agent is previously contained as a monomer component. Alternatively, the copolymer may be crosslinked after polymerization. A method of performing a crosslinking reaction with a compound may be used.

Examples of the above compounds used in the case of performing a crosslinking reaction after polymerization include, for example, haloepoxyalkanes such as epichlorohydrin and α-methylepichlorohydrin; ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, glycerin -1,3-diglycidyl ether, polyethylene glycol diglycidyl ether, bisphenol A
Polyepoxy compounds such as epichlorohydrin type epoxy resins; aldehydes such as formalin, glyoxal, and thiodiacetaldehyde; metal compounds such as calcium hydroxide, barium hydroxide, lead oxide, aluminum isopropylate, and titanium octylate; . Of the compounds exemplified above, haloepoxyalkanes and polyepoxy compounds are more preferred.

The cross-linking reaction after the polymerization with the above compound is based on 100 parts by weight of the starch used for obtaining the copolymer.
More preferably, the compound is used in the range of 0.001 to 10. The crosslinking reaction may be performed by a conventionally known method.

The polymerization reaction product obtained by the above polymerization method may be dried and pulverized as it is, or may be hydrolyzed to a hydrolyzate as required, and then dried and pulverized to obtain the present invention. And the copolymer. Before the above-mentioned drying and pulverization, the polymerization reaction product may be optionally washed with, for example, a mixed solvent of water and alcohol.

When the above-mentioned polymerization reaction product is hydrolyzed, the hydrolysis may be carried out by any conventionally known method, for example, in an aqueous solvent or a mixed solvent of water and an alcohol. A method using sodium hydroxide or the like at a temperature of 10 to 150 ° C. is used.
When a free carboxyl group, sulfonic acid group, or the like is present in the polymerization reaction product, neutralization may be performed by a conventionally known method, for example, to form a salt such as an alkali metal salt, an ammonium salt, or an amine salt. it can.

The weight average molecular weight of the above-mentioned copolymer as a sizing agent for raising seedlings of the present invention is not particularly limited.
It is preferable that it is in the range of 10,000 to 30,000,000.

The above-mentioned copolymer as a sizing agent for raising seedlings of the present invention is a graft copolymer having a branched structure derived from starch and a monomer having an addition-polymerizable double bond. It is. The graft polymerization rate of the copolymer is not particularly limited, but the higher the graft polymerization rate, the more resistant it is to the action of an enzyme such as amylase present in the seedling culture medium. On the other hand, the above copolymer is
Since it contains starch as a monomer component, it has excellent biodegradability and is easy to dispose.

The seedling cultivation soil of the present invention is obtained by mixing the above-mentioned paste for cultivating seedling cultivation and the seedling cultivation soil base material. Specific examples of the seedling cultivation base material according to the present invention include, for example, general soil and soil, peat moss (white peat moss from Canada, Sweden and Finland), vermiculite (south Africa and China). White vermiculite and red vermiculite), zeolite, perlite, coconut shell, bark, granulated granulated soil, and the like. The seedling cultivation soil substrate described above may be used alone or as a mixture of two or more. It is more preferable that the peat moss exemplified above does not undergo maturation. In addition, among the above-described seedling-growing mediums, a mixture of peat moss and vermiculite is particularly preferable.

The ratio of the paste for cultivating seedling cultivation to the seedling cultivation soil of the present invention, that is, the content of the copolymer as a paste for cultivating seedling cultivation is not particularly limited, but is 0.5 to 15% by weight.
Is more preferably within a range of 1 to 10% by weight, and most preferably within a range of 1 to 5% by weight. When the content is 0.5
If the amount is less than the weight percentage, the seedling raising substrate may not be solidified. If the content is 15% by weight or more, the cost may be high, and the seedling cultivation soil may swell and the seedlings may be difficult to grow.

As a method of mixing the seedling cultivation paste with the soil as a seedling cultivation base material, for example, using a mixing device such as a concrete mixer or a ribbon mixer, the paste for seedling cultivation and the soil are uniformly mixed. And a method of mixing them.

In addition to the above-described method of batch-mixing the seedling-growing soil and the soil, a masterbatch soil containing a high-concentration seedling-growing soil is prepared in advance and then mixed with the soil. A method of setting a predetermined concentration may be used.

The seedling cultivation soil according to the present invention contains, if necessary, a polymer other than the above-mentioned seedling cultivation soil sizing agent, other additives and the like within a range that does not inhibit the effect of the seedling cultivation soil sizing agent. You may. The paste for cultivating seedlings of the present invention and the cultivation of seedlings using the same can be used for agricultural and horticultural crops such as vegetables, flowers, seedlings, and rice. The seedling cultivation is particularly preferably used when the root pot portion of the soiled seedling is formed during the mechanical transplantation of the agricultural or horticultural crop.

Although the detailed mechanism by which the paste for cultivating seedling cultivation of the present invention shows solidification properties to the substrate for cultivating seedling cultivation is not clear, mainly the starch contained in the copolymer as the paste for cultivating seedling and cultivation is mentioned above. This is considered to be due to the adhesiveness of the resin. That is, it is considered that a solidification reaction occurs between the seedling cultivation soil base material and the copolymer due to intermolecular attraction such as hydrogen bonding due to the stickiness of the starch.

In some cases, the above-mentioned copolymer exhibits excellent water absorption and water retention due to a cross-linking structure by a cross-linking agent used if necessary. It is expressed by holding water in a network-like three-dimensional structure, and the sizing agent for seedling cultivation soil of the present invention is mainly used for the seedling cultivation base material due to the adsorptivity based on the above-mentioned adhesiveness of starch. There is no direct relationship with the mechanism that develops excellent solidification. That is, in order to exhibit the above-mentioned water absorption and water retention, it is not necessary for the starch portion to be sticky, which is essential for the solidification of the paste for cultivating seedlings of the present invention.

The sizing agent for raising seedlings of the present invention, as described above, mainly performs a solidification reaction by the adsorptivity based on the stickiness of starch.
It does not undergo a solidification reaction due to ionic bonds with polyvalent cations in the seedling culture medium. Therefore, a good solidified state can be stably obtained irrespective of the properties of the seedling culture substrate.

On the other hand, the sizing agent for seedling cultivation of the present invention does not have excessive stickiness as in the case of using only starch, for example. Has no effect. In addition, when storing in a state where the paste for seedling cultivation and the seedling cultivation base material are mixed,
Through the slight moisture contained in the seedling culture medium, the solidification reaction progresses, and it is possible to prevent the situation in which the preservability of the seedling culture soil is impaired beforehand. You can get the soil.

[0053]

[Examples] The disintegration of root pots using seedling cultivation soil and the seeding workability were measured or evaluated by the following methods.

[Disintegration of root pot portion]
They were randomly selected and dropped naturally from a height of 1.0 m on the ground so that the root mortar part was down, and the number of strains in which the root mortar part did not collapse was counted. It is determined that the greater the number, the less the collapse and the higher the strength of the root pot.

[Seeding workability] When the worker who tried to fill the seedling pot with the seedling cultivation soil determined that "the seedling cultivation soil was not sticky and could be sown by a machine", "O" The soil was sticky and could not be sowed with a machine. ''
The case was evaluated as x.

The present invention will be described more specifically with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1 50 parts of potato starch
140 parts of water and 850 parts of methanol were charged into a reaction vessel, stirred at 60 ° C for 1 hour under a nitrogen stream, and then cooled to 30 ° C. Next, 15 parts of acrylic acid and 60 parts of sodium acrylate as a monomer having an addition-polymerizable double bond, 1 part of N, N-methylenebisacrylamide as a crosslinking agent, and 0.5 parts of azobisvaleric acid was added, and the mixture was stirred and polymerized at 60 ° C. for 6 hours to obtain a white suspension (1).
Then, the powder obtained by filtering the white suspension (1) was mixed with a water-methanol mixed solution (water: methanol weight ratio,
2:10), dried under reduced pressure at 60 ° C. for 3 hours, and then pulverized to obtain 50 parts of a powdery starch / sodium acrylate graft copolymer as a paste for cultivating seedlings of the present invention.

The starch / sodium acrylate graft copolymer (200 g) was added to 5 kg of Canadian peat moss (trade name "BISHOP") as a base material for raising seedlings, and mixed for 3 minutes with a fertilizer mixer. Seedling culture was obtained. To 1 L of the seedling cultivation soil, 150 mg of nitrogen, 500 mg of phosphoric acid, and 200 mg of potassium were added as fertilizers.

A seedling raising tray (200 holes / tray) was filled with the above-mentioned seedling cultivation soil and lightly crushed. Then, the seedlings of lettuce (variety: athletics) are added to the seedling tray at a rate of 1 per pot.
The seeds were sown one by one, lightly covered with vermiculite, and then raised in a nursery house.

During the 3.0-3.5 leaf stage, a suitable amount of water was irrigated in the morning, and in the afternoon in a moderately moist state, 100 seedling pots were randomly selected from the above seedling trays to give 100 seedlings with soil. And the disintegration of the root pot and the sowing workability were measured or evaluated by the above-mentioned method for the 100 seedlings with soil. Table 1 shows the results.

Comparative Example 1 The same operation as in Example 1 was carried out except that polyacrylamide was used as a paste for raising seedlings for comparison instead of producing and using a starch / sodium acrylate graft copolymer. The seedling culture for comparison was prepared. With respect to the seedling cultivation soil for comparison, the disintegrability of the root pot and the seeding workability were measured or evaluated. Table 1 shows the results.

Comparative Example 2 The procedure of Example 1 was repeated except that a partially crosslinked sodium polyacrylate was used as a paste for raising seedlings for comparison instead of producing and using a starch / sodium acrylate graft copolymer. Perform the same operation as
A seedling culture was prepared for comparison. With respect to the seedling cultivation soil for comparison, the disintegrability of the root pot and the seeding workability were measured or evaluated. Table 1 shows the results.

Comparative Example 3 The same procedure as in Example 1 was carried out except that polyethylene oxide (PEO) was used as a paste for cultivating seedlings for comparison instead of producing and using a starch / sodium acrylate graft copolymer. Was performed to prepare a seedling culture medium for comparison. With respect to the seedling cultivation soil for comparison, the disintegrability of the root pot and the seeding workability were measured or evaluated. Table 1 shows the results.

Comparative Example 4 The procedure of Example 1 was repeated, except that instead of producing and using a starch / sodium acrylate graft copolymer, gellan gum was used as a comparative paste for cultivating seedlings. Was performed to prepare a seedling culture medium for comparison. With respect to the seedling cultivation soil for comparison, the disintegrability of the root pot and the seeding workability were measured or evaluated. Table 1 shows the results.

Comparative Example 5 A seedling culture was prepared in the same manner as in Example 1 except that the paste for cultivating seedling culture was not used. With respect to the seedling cultivation soil for comparison, the disintegrability of the root pot and the seeding workability were measured or evaluated. Table 1 shows the results.

[0066]

[Table 1]

As is clear from the results shown in Table 1, the root pot portion using the seedling raising soil of the present invention did not collapse at all, the root pot strength was high, the seeding workability was excellent, and the practicality was high. . In addition, it can be seen that the paste for cultivating seedling cultivation of the present invention has excellent solidification properties with respect to the base material for cultivating seedling cultivation.

Example 2 A commercially available horticultural product containing 200 g of a paste for cultivating seedling cultivation obtained in the same manner as in Example 1 and comprising, as a base material for cultivating seedling, a mixture of peat moss and vermiculite as a main component. A soil was added to 5 kg of "Sumisoil" (manufactured by Sumika Agricultural Materials Co., Ltd.) and mixed with a concrete mixer for 3 minutes to obtain a seedling culture of the present invention.

A seedling raising tray (128 holes / tray) was filled with the above seedling raising soil and lightly crushed. Thereafter, seeds of green onions (variety: Choho Onion) were sown on the seedling tray one by one per pot, lightly covered with vermiculite, and then raised in a seedling house.

In the 2.0-3.0 leaf stage, a suitable amount of water was irrigated in the morning and, in the afternoon, in a moderately moist state, 100 seedling pots were randomly selected from the above seedling trays and 100 seedlings were planted. And the disintegration of the root pot was measured by the above-mentioned method for the 100 seedlings with soil.
Table 2 shows the results.

Comparative Example 6 The same operation as in Example 2 was carried out except that polyacrylamide was used instead of a starch / sodium acrylate graft copolymer as a sizing agent for raising seedlings. Was prepared. With respect to the seedling culture soil for comparison, the disintegrability of the root pot was measured. Table 2 shows the results.

Comparative Example 7 The same operation as in Example 2 was carried out except that a partially crosslinked sodium polyacrylate was used instead of the starch / sodium acrylate graft copolymer as a sizing agent for raising seedlings. The seedling culture for comparison was prepared. With respect to the seedling culture soil for comparison, the disintegrability of the root pot was measured. Table 2 shows the results.

Comparative Example 8 The same operation as in Example 2 was carried out except that PEO was used instead of a starch / sodium acrylate graft copolymer as a sizing agent for raising seedlings. A seedling culture was prepared. With respect to the seedling culture soil for comparison, the disintegrability of the root pot was measured. Table 2 shows the results.

Comparative Example 9 The same operation as in Example 2 was carried out except that gellan gum was used instead of the starch / sodium acrylate graft copolymer as a sizing agent for raising seedlings. A seedling culture was prepared. With respect to the seedling culture soil for comparison, the disintegrability of the root pot was measured. Table 2 shows the results.

Comparative Example 10 A seedling culture was prepared in the same manner as in Example 2 except that the paste for seedling culture was not used. With respect to the seedling culture soil for comparison, the disintegrability of the root pot was measured. Table 2 shows the results.

[0076]

[Table 2]

As is evident from the results in Table 2, the root pot portion using the seedling cultivation soil of the present invention hardly collapses, the root pot strength is high, and the practicality is high.

Example 3 25 g of the same sizing agent for cultivating seedlings as in Example 1 was added to 5 kg of cultivation soil for soil, "Sumisoil", which was the same as in Example 2, and mixed for 3 minutes with a concrete mixer. It was obtained as a seedling culture soil of the present invention. Therefore, the content of the paste for cultivating seedling cultivation in the cultivating seedling of the present invention was 0.5% by weight. Using the seedling cultivation soil, the disintegration of the root pot was measured in the same manner as in Example 2. Table 3 shows the results.

[Examples 4 to 7] The same operation as in Example 3 was carried out except that the content of the above-mentioned sizing agent for seedling cultivation in the seedling cultivation was set to each weight% shown in Table 3. A seedling culture was obtained. For each seedling cultivation soil, the disintegrability of the root pot was measured by the above method. Table 3 shows the results.

[0080]

[Table 3]

As is evident from the results in Table 3, it can be seen that by setting the content of the above-mentioned paste for cultivating seedling cultivation in the cultivating seedling within a predetermined range, the cultivated seedling cultivation can be maintained in a better solidified state.

[0082]

According to the first aspect of the present invention, the sizing agent for raising seedlings is a copolymer obtained by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond. It is the structure which consists of.

Therefore, the above-mentioned copolymer is obtained by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond, thereby reducing the adsorptivity mainly derived from starch. It can be exerted moderately, and the adsorptivity makes it possible to solidify the base material for raising seedlings. That is, the solidification using the above-mentioned copolymer can stably maintain a good solidified state without being directly affected by the properties of the seedling culture medium. Therefore, for example, it is possible to solidify a seedling cultivation soil base mainly composed of peat moss or vermiculite, which hardly contains polyvalent cations and the like. Further, unlike the case where the seedling-grown soil base material is solidified by ionic bonding, an excessive solidification reaction does not occur, so that the storage stability is excellent. Furthermore, unlike the case where only starch is used, there is an effect that an excessive adhesiveness does not occur in the seedling cultivation soil, and an adhesive for seedling cultivation excellent in seeding workability can be provided.

As described above, the sizing agent for raising seedlings according to the second aspect is characterized in that, in addition to the constitution according to the first aspect, the monomer having an addition-polymerizable double bond is (meth) acrylic acid (salt). ).

The sizing agent for cultivating seedlings according to claim 3 has a structure in which the copolymer has a crosslinked structure in addition to the structure described in claim 1 or 2 as described above.

[0086] Therefore, since the above-mentioned copolymer has the above-mentioned structure, it is possible to provide more appropriate tackiness, and it is possible to provide a paste for cultivating seedling cultivation which can stably maintain a better solidified state. This has the effect.

[0087] As described above, the sizing agent for raising seedlings according to the fourth aspect has the starch and the addition-polymerizable double bond in addition to the constitution according to any one of the first to third aspects. The ratio of the monomer to 100 parts by weight of the starch is in the range of 10 to 2,000 parts by weight.

Therefore, when the above ratio is within the above range, the above copolymer can exhibit more appropriate tackiness, so that a more excellent solidified state can be maintained stably. This has the effect of providing a paste for use.

[0089] The seedling cultivation soil of claim 5 is, as described above, configured by mixing the paste for seedling cultivation soil according to any one of claims 1 to 4 with a seedling cultivation soil base material.

Therefore, the sizing agent for seedling culture is obtained by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond, thereby mainly adsorbing starch derived from starch. The seedling medium can be solidified by the adsorptivity. In other words, the solidification using the copolymer is not directly dependent on the mechanism of solidifying the seedling culture substrate by ionic bonding with the polyvalent cations in the seedling culture substrate, and is directly affected by the properties of the seedling culture substrate. Therefore, a good solid state can be stably maintained. Further, unlike in the case of solidification by ionic bonding, an excessive solidification reaction does not occur, so that it is possible to obtain a seedling culture soil excellent in preservability. Furthermore, since the stickiness is not generated in the seedling cultivation soil, there is an effect that a seedling cultivation soil excellent in seeding workability can be provided.

The seedling cultivation soil according to claim 6 is, as described above, in addition to the constitution according to claim 5, wherein the ratio of the paste for cultivating seedling cultivation to the seedling cultivation is within a range of 1 to 5% by weight. There is a certain configuration.

Therefore, when the above-mentioned sizing agent for seedling cultivation is contained within the above range, a better solidified state can be stably maintained, and seedling cultivation excellent in seeding workability and preservability can be obtained. It has the effect that it can be provided.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B022 AA05 BA02 BA03 BA04 BA11 BA14 BA16 BA21 BB10 2B027 NC05 NC13 NC14 NC16 NC21 NC27 NC41 NC56 4H026 AA13 AB03

Claims (6)

[Claims] 1. A sizing agent for raising seedlings, comprising a copolymer obtained by polymerizing a monomer component containing starch and a monomer having an addition-polymerizable double bond. 2. A sizing agent for cultivating seedlings according to claim 1, wherein the monomer having an addition-polymerizable double bond is (meth) acrylic acid (salt). 3. The paste for raising seedlings according to claim 1, wherein the copolymer has a crosslinked structure. 4. The ratio of the starch to the monomer having an addition-polymerizable double bond is in the range of 10 to 2,000 parts by weight based on 100 parts by weight of the starch. The paste for raising seedlings according to any one of claims 1 to 3, characterized in that: 5. A seedling cultivation soil comprising a mixture of the paste for cultivating seedling cultivation according to any one of claims 1 to 4 and a base material for cultivating seedling cultivation. 6. The seedling cultivation soil according to claim 5, wherein the ratio of the paste for cultivating seedling cultivation to the seedling cultivation soil is within a range of 1 to 5% by weight.