JPH09154322A - Granulated and coated seed and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain granulated and coated seeds excellent in handleability, reducing a compound granule during coating while maintaining the hardness of the granulated and coated seeds by granulating and coating the seeds using a specific binder as a wetting agent. SOLUTION: Seeds are coated with a binder such as a carboxymethyl cellulose or a polyvinyl alcohol having <=50mPa.s viscosity at 25 deg.C when it is a 5wt.% aqueous solution as a wetting agent to give the objective granulated and coated seeds. Preferably, the viscosity of the wetting agent is adjusted to <=50mPa.s viscosity at 25 deg.C and the adjusted wetted agent is added to a mixture of the seeds and a composition for granulation to carry out granulation and coating.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a granulated coated seed and a method for producing the same.

[0002]

2. Description of the Related Art In the field of agriculture and forestry, labor saving is an important proposition for cost reduction. For example, also in sowing of seeds such as vegetables, as a part of labor saving, seeds are precisely machined as in the case of manual sowing (this makes it possible to omit or simplify troublesome thinning work). And a mixture of granules such as red clay and clay, polyvinyl alcohol, starch, carboxymethyl cellulose,
It has been known for a long time that a fluidized bed type granulator or an inclined rotary pan type granulator is used with a binder which is an organic binder such as gelatin as a wetting agent (for example, Japanese Patent Publication No. 38-3469).

The granulated coated seed thus obtained is crushed into blocks due to water absorption in the coating layer when a suitable amount of water is encountered in the soil after sowing and cracks are formed at 2-3 places. , Germination occurs.

[0004]

However, in the conventional granulation coating, during the granulation coating,
There is a problem that compound grains in which two or more seeds are bound tend to occur. This problem occurs due to the binder described above, since the binder is to bind the granulating material mainly composed of the inorganic material in the granulating composition,
It cannot be usually omitted in order to impart sufficient hardness to the granulated coated seeds, and therefore, in the conventional granulated coating, it is necessary to prevent the formation of compound granules and maintain the hardness of the granulated coated seeds at the same time. There is a problem that you can not.

In view of the above problems, the present invention provides a granulated coated seed and a method for producing the granulated coated seed, which can reduce the number of compound grains during the granulating coating while maintaining the hardness of the granulated coated seed. The purpose is to

[0006]

The granulated coated seed of the present invention has a viscosity of a 5% by weight aqueous solution at 25 ° C. of 50 mPas.
-It is characterized by being granulated and coated with a binder having a viscosity of s or less as a wetting agent.

Thus, if the viscosity of a 5% by weight aqueous solution of a binder used as a wetting agent when granulating and coating seeds is 50 mPa · s or less at 25 ° C., the mixture of seed and granulating composition is obtained. The viscosity of the wetting agent applied to the granules is set so that the hardness of the obtained granulated coating seeds can be maintained and the generation of compound granules during granulation coating can be reduced. be able to. That is, it is possible to reduce the viscosity of the wetting agent and reduce the generation of double grains while increasing the binder concentration to impart sufficient hardness.

In the method for producing a granulated coated seed of the present invention, the viscosity of the wetting agent is 50 mPa · s at 25 ° C.
It is preferable from the viewpoint of the effect of reducing granules that the humectant is adjusted to s or less and then the humectant thus adjusted is added to the mixture of the seed and the granulation composition for granulation coating.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The matters relating to the implementation of the present invention will be described in detail below.

Binder As a binder, carboxymethyl cellulose (hereinafter,
Called CMC. ), Polyvinyl alcohol (hereinafter, PV
A. ), Polyvinylpyrrolidone (hereinafter referred to as PVP), and the like, and in the present invention, a 5 wt% aqueous solution thereof has a viscosity of 50 mPa · s.
Those (25 ° C.) or less can be used.

Specifically, serogen 5A (CMC manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., trade name), GL-05 (PVA manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name), GH-17 (Nippon Synthetic Chemistry). Industrial PVA, trade name), PVP K-15
(GAF PVP, trade name) and the like are preferably used.

Serogen 5A is CMC having an average molecular weight of about 60,000 and an etherification degree of about 0.7 to 0.8, and its 5 wt% aqueous solution has a viscosity (25 ° C.) of 16 mPa · s.

GL-05 is PVA having a polymerization degree of 1,000 or less and a saponification degree of 86.5 to 89.0, and the viscosity (25 ° C.) of a 5 wt% aqueous solution thereof is 6 mPa · s.

GH-17 is PVA having a polymerization degree of 1,500 or more and a saponification degree of 86.5 to 89.0, and the viscosity (25 ° C.) of a 5 wt% aqueous solution thereof is 45 mPa · s.

PVP K-15 is PVP having an average molecular weight of about 10,000, and its 5 wt% aqueous solution has a viscosity (25 ° C.) of 1.4 mPa · s.

Granulating Composition The granulating composition comprises a granulating material and optionally a hydrophobic agent,
Plant hormones, plant nutrients, plant growth regulators, fungicides,
You may contain auxiliary components, such as an oxygen generating agent and a fertilizer.

As the granulating material, an inorganic substance usually used for the purpose of granulation coating of seeds can be used as it is.
For example, diatomaceous earth, silica, red clay, clay, perlite,
Volcanic ash, volcanic rock, feldspar, talc, kaolin, clay minerals,
Bentonite, calcium carbonate, calcium hydroxide, aluminum hydroxide and the like can be used alone or in combination. A silica-based inorganic material is preferable. It should be noted that fine powder having an average particle diameter of 20 μm or less is preferable, but it is not particularly limited.

As the hydrophobic agent, a saturated or unsaturated higher fatty acid having 14 to 22 carbon atoms, a higher alcohol, or a derivative thereof is used. Suitable hydrophobic agents include stearic acid, metal salts of stearic acid (Na, K, Mg, Ca,
Ba salt, etc.), stearyl alcohol, alkylene oxide adducts of stearyl alcohol (ethylene oxide adduct, propylene oxide adduct, etc.) and the like.
The particle size of the hydrophobic agent is preferably fine powder, usually 20μ
Those having a size of m or less are used, but are not particularly limited.

The amount of the hydrophobic agent used is preferably 0.5 parts by weight or more based on 100 parts by weight of the granulating material in order to exert its effect. More preferably, 2 to 15 parts by weight is used.

Wetting Agent The wetting agent is applied to the seed and the composition for granulation by spraying or the like at the time of granulation coating, and an aqueous solution of the above binder is used. The wetting agent has a viscosity of 50 mP from the viewpoint of preventing complex particles during granulation coating.
It is preferably a · s (25 ° C.) or less. For example,
If the binder is the above serogen 5A, 5% by weight or less,
10% by weight or less for GL-05, 5% by weight or less for GH-17, 35% by weight for PVP K-15
It is preferable to make the following adjustments and spray the adjusted wetting agent.

Since the wetting agent also functions to bind the granulating composition with the binder, the binder concentration is preferably 0.5% by weight or more.

The wetting agent may contain auxiliary components of the above-mentioned granulating composition such as plant hormones and plant nutrients. In this case, the viscosity of the wetting agent containing these auxiliary components is preferably 50 mPa · s (25 ° C.) or less.

Granulation Coating Method For the granulation coating, various known granulation devices such as an inclined rotary pan type granulator and a fluidized bed type granulator can be used.

In the granulation coating, the granulating composition powder can be added to the seed while spraying a wetting agent onto the seed to form a coating layer on the surface of the seed.

The size of the obtained granulated coated seeds cannot be said to be unequivocal because the weight and size of the original seeds are different, but it is not particularly limited as long as it can be mechanically sown.

The type of seed that is granulated and coated is not limited. Normal seeds or processed seeds such as shelled so-called peeled seeds (naked seeds) can be used.

[0027]

EXAMPLES Hereinafter, specific examples and effects of the present invention will be shown by examples and comparative examples, but the present invention is not limited to these examples.

Examples 1 to 4 and Comparative Examples 1 to 3 500 g of ginseng seeds with a germination rate of about 85% were put into an inclined rotary pan, and 90 parts by weight of diatomaceous earth and steer were added while spraying the wetting agent shown in Table 1. A granulating composition consisting of 10 parts by weight of calcium phosphate was added until the total weight of the granulating composition and binder was 10 times the seed weight (the particle size of the granulated coated seed was about 3.5 mm. ) After granulation coating, it was dried at 45 ° C. for 3 hours.

In Table 1, serogen 7A (trade name) is CMC manufactured by Daiichi Kogyo Seiyaku Co., Ltd., and NH-20 (trade name) is PVA manufactured by Nippon Synthetic Chemical Industry Co., Ltd. The viscosity of a 5% by weight aqueous solution (25 ° C) of these is serogen 7A
120 mPa · s, NH-20 70 mPa · s
And both are larger than 50 mPa · s (25 ° C.).

A germination test was carried out on the granulated coated seed thus obtained. Germination test is 9 cm
2 sheets of filter paper are laid on a petri dish of φ, and 5 ml of water is poured onto it, and 50 seeds coated with granulation are placed on
The test was carried out by placing it in a thermostat at 0 ° C. In addition, about Examples 2-4 and the comparative examples 1-3 in which the compound grain generate | occur | produced, the compound grain was removed and the said test was done. Table 1 shows the results.

[0031]

[Table 1] * 1 Wetting agent viscosity was measured with a B-type viscometer (2
5 ° C). * 2 The ratio (%) of the granulated coated seeds in which two or more particles are bound, and was determined by inspecting 500 granulated coated seeds. * 3 Measured using a push-pull scale (manufactured by Komura Seisakusho) (average value of 20 tablets). * 4 Germination vigor is the percentage of seeds that have germinated 6 days after the start of the test. * 5 Germination rate is the rate of germinated seeds 10 days after the start of the test.

As is clear from Table 1, binders (serogen 5A, GL-05, PVP K-15, GH) whose 5 wt% aqueous solution has a viscosity of 50 mPa · s (25 ° C.) or less.
In Examples 1 to 4 in which -17) was used as a wetting agent, the occurrence rate of compound grains was low, and sufficient hardness could be imparted to the granule-coated seeds. In each of Examples 1 to 4, since the viscosity of the wetting agent was 50 mPa · s or less, almost no double grains were generated.

On the other hand, in Comparative Examples 1 to 3, since a binder having a viscosity of a 5% by weight aqueous solution of more than 50 mPa · s (25 ° C.) is used as a wetting agent, its concentration is increased to obtain a sufficient hardness. In the case of imparting a compound, the generation rate of compound grains was very high (Comparative Examples 1 and 2). On the other hand, when the concentration was lowered to suppress the generation of compound grains, sufficient hardness could not be obtained, which was not suitable for labor saving such as mechanical seeding (Comparative Example 3).

Further, in the germination test, the granulated coated seeds of Comparative Examples 1 to 3 adhere to the seeds as if the granulated material melted, so that the germinated seeds of Examples 1 to 4 are germinated. The germination rate was low.

[0035]

As described above, according to the present invention, it is possible to reduce the number of compound grains during granulation coating while maintaining the hardness of the granule coating seeds.

Claims (3)

[Claims] 1. The viscosity of a 5% by weight aqueous solution is 50 m at 25 ° C.
Granulated coated seeds characterized by being granulated coated using a binder having a Pa · s or less as a wetting agent. 2. The viscosity of a 5% by weight aqueous solution is 50 m at 25 ° C.
A method for producing granulated coated seeds, which comprises granulating and coating seeds using a binder having a viscosity of Pa · s or less as a wetting agent. 3. The method for producing a granulated coated seed according to claim 2, wherein the viscosity of the wetting agent is 50 mP at 25 ° C.
A method for producing a granulated coated seed, which comprises adjusting the wetting agent to be not more than a · s, and applying the adjusted wetting agent to a mixture of the seed and the granulating composition to perform granulating coating.