JP6969862B2 - Coated rice seeds and their manufacturing method - Google Patents

Description

The present invention relates to coated rice seeds and a method for producing the same.

Direct sowing of paddy rice is a cultivation method in which rice seeds are sown directly in paddy fields, and has the advantage of saving labor in agricultural work because it does not require raising seedlings or transplanting, but it is also damaged by birds such as ducks and sparrows. It also has the disadvantage of being susceptible to (bird damage). Since the decrease in the rate of seedlings due to bird damage leads to a decrease in revenue, measures to avoid bird damage have been eagerly desired. As a conventional bird damage avoidance measure, for example, a method of preventing bird damage by water management has been proposed, but it is necessary to change the management method according to the type of bird (see, for example, Non-Patent Document 1). ..
Further, iron-coated direct sowing is known as a technique of coating rice seeds with iron powder to suppress the floating of seeds in soil surface sowing and prevent feeding damage by sparrows (for example, Non-Patent Document 2). reference). However, since this technology utilizes the fact that iron powder is solidified by oxidation, it is troublesome to manage rice seeds after coating, such as the need to dissipate the heat generated during oxidation, and the management thereof. There was a problem that the germination rate decreased when the amount was insufficient. As a method for solving such a problem, for example, a technique for coating rice seeds using polyvinyl alcohol having a high degree of saponification and a coating material such as iron oxide is known (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-146266

Nagao Sakai, 3 outsiders, "Measures to Prevent Cultivated Bird Damage in Direct Sowing Cultivation of Paddy Rice", Hokuriku Crop Science Society of Japan, March 31, 1999, Vol. 34, p. 59-61 Minoru Yamauchi, "Iron Coating Flooded Direct Seeding Manual 2010", National Agriculture and Food Research Organization Kinki Chugoku-Shikoku Agricultural Research Center, March 2010

However, the effect of preventing bird damage on rice seeds coated with iron oxide was not sufficient.
It is an object of the present invention to provide coated rice seeds that are less susceptible to bird damage and that suppress the floating of seeds and the decrease in germination rate.

As a result of studies to solve such a problem, the present inventor coats rice seeds with zinc oxide, a specific synthetic resin, and a surfactant and sows them in paddy fields to reduce bird damage. It was found that a sufficient seedling standing rate can be secured in direct sowing cultivation of paddy rice.
That is, the present invention is as follows.
[1] A coated rice seed having a coating layer, wherein the coating layer contains zinc oxide, a surfactant, and at least one selected from the following group (A).
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
[2] A coated rice seed having a coating layer, wherein the coating layer contains zinc oxide and at least one selected from the following group (A), and a surfactant is retained at least on the surface. Coated rice seeds.
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
[3] The rice seed according to [1] or [2], wherein the coating layer contains at least one selected from the following group (B).
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate.
[4] The coating layer comprises a first layer containing at least one selected from the group (B) and a second layer containing zinc oxide provided outside the first layer [4]. 3] The rice seeds described in.
[5] A powdery composition having an average particle size in the range of 0.01 to 150 μm, which comprises zinc oxide and at least one selected from the following group (B).
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate.
[6] A powdery composition containing zinc oxide, at least one selected from the following group (B), and at least one selected from the following group (C).
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate.
Group (C): A group consisting of an acrylic resin and a vinyl acetate resin.
[7] The composition according to [5] or [6], wherein the apparent specific gravity is in the range of 0.30 to 2.0 g / mL.
[8] The composition according to any one of [5] to [7], wherein the average particle size of zinc oxide is in the range of 0.01 to 100 μm.
[9] A kit for producing coated rice seeds, which comprises zinc oxide, a surfactant, and at least one selected from the following group (A).
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
[10] The kit according to [9], which comprises at least one selected from the following group (B).
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate.
[11] A method for producing coated rice seeds, which comprises the following steps.
(1) While rolling the rice seeds, add at least one aqueous dispersion selected from the following group (A) and zinc oxide, and add at least one selected from the following group (A) and zinc oxide. A step of forming a coating layer containing and (2) a surfactant is added while rolling the seeds obtained in the step (1), and an interface is formed on the outside of the layer formed in the step (1). A step of retaining the activator and (3) a step of drying the seeds obtained in the step (2).
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
[12] A method for producing coated rice seeds, which comprises the following steps.
(1) While rolling the rice seeds, at least one aqueous dispersion selected from the following group (A), at least one selected from the following group (B), and zinc oxide are added to the following group. A step of forming a coating layer containing at least one selected from (A), at least one selected from the following group (B), and zinc oxide, (2) seeds obtained in the above step (1). While rolling, a surfactant is added to hold the surfactant on the outside of the layer formed in the step (1), and (3) the seeds obtained in the step (2) are dried. Process.
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate.
[13] A method for producing coated rice seeds, which comprises the following steps.
(1) (I) While rolling the rice seeds, add at least one aqueous dispersion selected from the following group (A) and at least one selected from the following group (B), and add the following group (I). A step of forming a coating layer containing at least one selected from the following group (B) and at least one selected from the following group (B), and (II) while rolling the seeds obtained in the above step (I). , At least one aqueous dispersion selected from the following group (A) and zinc oxide are added, and at least one selected from the following group (A) is added to the outside of the layer formed in the step (I). , (2) While rolling the seeds obtained in the above step (1), a surfactant was added to form a coating layer containing zinc oxide, and the layer formed in the above step (1) was formed. A step of retaining the surfactant on the outside, and (3) a step of drying the seeds obtained in the above step (2).
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate.
[14] Coated rice seeds produced by the production method according to any one of [11] to [13].

The coated rice seeds of the present invention are less susceptible to bird damage, and the floating of seeds and the decrease in germination rate are suppressed, so that a sufficient seedling standing rate can be ensured in direct sowing cultivation of paddy rice.

It is explanatory drawing for demonstrating the simple seed coating machine used for the coating of rice seeds in an Example.

The coated rice seed of the present invention (hereinafter referred to as the present rice seed) has a coating layer, and the coating layer is zinc oxide, a surfactant, and at least one selected from the group (A) (hereinafter referred to as "A"). , The present synthetic resin), or the coating layer contains zinc oxide and the present synthetic resin, and the surfactant is at least retained on the surface.

In the present invention, the rice seed refers to the seed of a variety generally cultivated as rice. Examples of the varieties include Japonica varieties and Indica varieties, but varieties having high lodging resistance and germination resistance are preferable.

In the present invention, zinc oxide refers to a compound represented by ZnO, and commercially available zinc oxide can be used. Examples of commercially available zinc oxide include zinc oxide 3N5 (manufactured by Kanto Chemical Co., Inc.) and a type of zinc oxide (manufactured by Nippon Kagaku Kogyo Co., Ltd.). In the present invention, it is preferable to use zinc oxide having a purity of 99% or more (% by weight based on the zinc oxide). The purity of zinc oxide is determined by the test method specified in Japanese Industrial Standards (JIS) K1410. Further, powdered zinc oxide is usually used, and the average particle size of the zinc oxide is in the range of 0.01 to 100 μm, preferably 0.1 to 50 μm, and more preferably 0.1 to 10 μm. In the present invention, the average particle size of zinc oxide is a particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and refers to a particle size having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle size of zinc oxide can be determined by a so-called wet measurement method in which zinc oxide particles are dispersed in water using a master sizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. can.

The content of zinc oxide in the rice seeds is usually in the range of 0.005 to 80% by weight, preferably 0.05 to 70% by weight, and more preferably 0.1 to 50% by weight. Considering the growth of plants and the influence on the environment, the range of 0.1 to 15% by weight is preferable.

As the surfactant in the present invention, at least one selected from the group consisting of nonionic surfactants and anionic surfactants is preferable, and it is composed of polyoxyethylene alkyl ether, polyoxyethylene aryl phenyl ether and sulfonate. At least one selected from the group is more preferred. Further, the polyoxyethylene arylphenyl ether is preferably polyoxyethylene polystyrylphenyl ether, and the sulfonate is naphthalene sulfonate and its formaldehyde condensate, phenol sulfonate and its formaldehyde condensate, and lignin. It is preferably at least one selected from the group consisting of sulfonates.
Examples of the polyoxyethylene alkyl ether include polyoxyethylene stearyl ether and polyoxyethylene tridodecyl ether. Examples of the polyoxyethylene polystyrylphenyl ether include polyoxyethylene tristylylphenyl ether. Examples of the naphthalene sulfonate and its formaldehyde condensate include a formaldehyde condensate of sodium naphthalene sulfonate, and examples of the phenol sulfonate and its formaldehyde condensate include a formaldehyde condensate of sodium phenol sulfonate. Examples of the lignin sulfonate include sodium lignin sulfonate. These surfactants are commercially available. For example, examples of the commercially available polyoxyethylene tristyrylphenyl ether include Solpol 5080 (manufactured by Toho Chemical Industry Co., Ltd.), which is a commercially available formaldehyde of sodium naphthalene sulfonate. Examples of the condensate include New Calgen PS-P (manufactured by Takemoto Oil & Fats Co., Ltd.).
In the present invention, it is preferable to use a powdery surfactant, and it is preferable to use a surfactant having a particle size distribution of 2% or less of particles having a size of 100 μm or more. In the present invention, the particle size distribution of the surfactant means the particle size distribution measured by the sieving method, and that particles having a size of 100 μm or more have a particle size distribution of 2% or less means that the particles have an opening of 100 μm and remain on the sieve. It is shown that the weight ratio to the total amount is 2% or less. For the particle size distribution of the surfactant, place 10 g of the surfactant on a sieve with an opening of 100 μm (a test sieve having a frame diameter of 200 mm and a depth of 45 mm specified in Japanese Industrial Standards (JIS) Z8801-1) and low tap. After sieving for 10 minutes with a sieving device such as a shaker, the weight of the surfactant remaining on the sieve can be weighed and calculated by the following formula.
Remaining amount on the sieve (%) = Weight of the surfactant remaining on the sieve (g) / Weight of the surfactant placed on the sieve at the beginning (g) × 100
The content of the surfactant in the rice seeds is usually in the range of 0.002 to 6% by weight, preferably 0.01 to 5% by weight, and more preferably 0.1 to 2% by weight.

The synthetic resin will be described below.
In the present invention, the acrylic resin means a polymer compound obtained by reacting at least an acrylic acid alkyl ester or a methacrylic acid alkyl ester as one of the monomers. Examples of the acrylic acid alkyl ester include methyl acrylate, ethyl acrylate, butyl acrylate and 2-ethylhexyl acrylate, and examples of the methacrylic acid alkyl ester include methyl methacrylate.
The vinyl acetate resin refers to a polymer compound obtained by reacting at least vinyl acetate as one of the monomers.
The urethane resin is a polymer compound obtained by reacting a polyisocyanate with a polyol. Examples of the polyisocyanate include aliphatic isocyanates such as hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI), and examples of the polyisocyanate include aliphatic isocyanates. Examples thereof include polyether polyols such as polyethylene glycol and polypropylene glycol, polyester polyols such as polyethylene adipate glycol and polybutylene adipate glycol, and polycarbonate polyols such as polybutylene carbonate diol and polyhexamethylene carbonate diol.
The butadiene copolymer refers to a copolymer of 1,3-butadiene (hereinafter referred to as butadiene) and at least one monomer copolymerizable therewith.
As the acrylic resin, a copolymer of an acrylic acid alkyl ester or a methacrylic acid alkyl ester and at least one selected from the group consisting of an aromatic vinyl monomer, an olefin monomer and a silicone macromer is preferable. Examples of the aromatic vinyl monomer include styrene, and examples of the olefin monomer include ethylene. Specific examples of the acrylic resin include a copolymer of an acrylic acid alkyl ester and a methacrylic acid alkyl ester (Moinyl-Powerer LDM7000P manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), and a copolymer of an acrylic acid alkyl ester and styrene. (Mobile 6485, etc. manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), a copolymer of acrylic acid alkyl ester and silicone macromer (Mobile 7110, etc. manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) and a copolymer of ethylene and methacrylic acid alkyl ester (copolymer of ethylene and methacrylic acid alkyl ester, etc.) Mitsui-Dupont Polychemical Co., Ltd. Nuclel N1108C, etc.) can be mentioned.
The vinyl acetate resin has a common weight of vinyl acetate and at least one selected from the group consisting of an acrylate alkyl ester, an alkyl methacrylate ester, a vinyl versatic acid, an olefin monomer, a halogenated olefin monomer and an unsaturated dicarboxylic acid. Coalescence is preferred. Examples of the acrylic acid alkyl ester include methyl acrylate, ethyl acrylate, butyl acrylate and 2-ethylhexyl acrylate, and examples of the methacrylic acid alkyl ester include methyl methacrylate. Examples of the olefin monomer include ethylene, examples of the halogenated olefin monomer include vinyl chloride and vinylidene chloride, and examples of the unsaturated dicarboxylic acid include maleic acid. Specific examples of the vinyl acetate resin include a copolymer of vinyl acetate, vinyl versatic acid, and an acrylic acid alkyl ester (Moinyl-Poder LDM2072P manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), and a common weight of vinyl acetate and ethylene. Examples thereof include a coalescence (Mobile 180E manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) and a copolymer of ethylene, vinyl acetate and vinyl chloride (Sumikaflex 808HQ manufactured by Sumika Chemtex Co., Ltd.).
As the urethane resin, a urethane resin obtained by polymerizing an aliphatic isocyanate and at least one selected from the group consisting of polyester polyols and polycarbonate polyols is preferable. Specifically, the urethane resin is formed by polymerizing a urethane resin (such as Superflex 500M manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) in which an aliphatic isocyanate and a polyester polyol are polymerized, and an aliphatic isocyanate and a polycarbonate polyol. Examples thereof include urethane resin (Superflex 460 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.).
As the butadiene copolymer, a copolymer of butadiene and at least one selected from the group consisting of methacrylic acid alkyl esters and aromatic vinyl monomers is preferable. Examples of the methacrylic acid alkyl ester include methyl methacrylate, and examples of the aromatic vinyl monomer include styrene. Specific examples of the butadiene copolymer include a copolymer of butadiene and styrene (hereinafter referred to as butadiene-styrene copolymer) and a copolymer of butadiene, styrene and methyl methacrylate (hereinafter referred to as butadiene-). Styrene-methyl methacrylate copolymer), carboxylated butadiene-styrene copolymer (Nalstar SR103, etc. manufactured by Nippon A & L Co., Ltd.) and carboxylated butadiene-styrene-methyl methacrylate copolymer (Nippon A & L) Nalstar SR140 manufactured by Narustar Co., Ltd., etc.).
The glass transition point (Tg) of the synthetic resin is usually 50 ° C. or lower, preferably -50 ° C. to 50 ° C. Further, it is preferable to use the present synthetic resin having a minimum film forming temperature (MFT) of 10 ° C. or lower.

The form of the synthetic resin in the present invention is latex or powder. Latex is an aqueous dispersion of fine particles of synthetic resin, and the average particle size of the fine particles is usually 1 μm or less. In the present invention, the average particle size of the fine particles of the synthetic resin in the latex is the particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and the particle size is 50% in cumulative frequency in the volume reference frequency distribution. Point to. The average particle size of the synthetic resin fine particles is determined by a method of measuring by dispersing the synthetic resin fine particles in water using a master sizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. be able to. The content of the synthetic resin in the latex is usually about 30 to 70% (weight% with respect to the latex). In addition, the form is latex, and commercially available synthetic resins include Movinyl 6485 (copolymer of acrylic acid alkyl ester and styrene) manufactured by Nippon Synthetic Chemical Industry Co., Ltd. and Narustar SR140 (Narustar SR140) manufactured by Nippon A & L Co., Ltd. Carboxylated butadiene-styrene-methyl methacrylate copolymer), Sumikaflex 808HQ (copolymer of ethylene, vinyl acetate and vinyl chloride) manufactured by Sumika Chemtex Co., Ltd. and Superflex 500M manufactured by Daiichi Kogyo Seiyaku Co., Ltd. (Urethane resin obtained by polymerizing an aliphatic isocyanate and a polyester polyol) can be mentioned.
The powdery synthetic resin is generally obtained by spray-drying the latex. The particle size of the powdery synthetic resin is usually 1000 μm or less, preferably 500 μm or less. In the present invention, the particle size of the powdery synthetic resin is a particle size measured by a sieving method, and is a sieve through which the entire amount of the powdery synthetic resin can pass (frame diameter 200 mm, depth 45 mm, Japanese Industrial Standards). It is represented by the minimum value of the mesh size of the test sieve specified in the standard (JIS) Z8801-1. In addition, the synthetic resin in its form is powdery, and commercially available synthetic resins include Moulinyl-Powerder DM2072P (copolymer of vinyl acetate, vinyl versatic acid, and acrylic acid alkyl ester) manufactured by Nippon Synthetic Chemical Industry Co., Ltd. Examples thereof include Mowinyl-Powerer LDM7000P (copolymer of an acrylic acid alkyl ester and a methacrylic acid alkyl ester) manufactured by Nippon Synthetic Chemical Industry Co., Ltd.

The content of the synthetic resin in the rice seeds is usually in the range of 0.01 to 5% by weight, preferably 0.05 to 4% by weight, and more preferably 0.1 to 2% by weight.

The coating layer may contain at least one selected from the group (B) (hereinafter referred to as the present inorganic compound). Examples of the clay in this inorganic compound include pyrophyllite and kaolin. Further, since the adhesion to rice seeds is good, at least one selected from the group consisting of clay, barium sulfate and calcium carbonate is preferable, and calcium carbonate is particularly preferable.
In the present invention, it is preferable to use the powdery inorganic compound, and the average particle size thereof is usually 200 μm or less, preferably 150 μm or less. In the present invention, the average particle size of the present inorganic compound is a particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and refers to a particle size having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle size of the inorganic compound is determined by a method of measuring by dispersing the particles of the inorganic compound in water using a master sizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. be able to.
When two or more kinds of inorganic compounds having different average particle sizes selected from the group (B) are used as the present inorganic compound, the coating layer becomes a denser coating layer. In two or more kinds of inorganic compounds having different average particle sizes, the inorganic compounds may be the same or different. Preferably, calcium carbonate having an average particle size in the range of 1 to 20 μm and calcium carbonate having an average particle size in the range of 25 to 70 μm are mixed and used.
When the coating layer contains the present inorganic compound, the content thereof in the present rice seeds is usually in the range of 0.5 to 80% by weight, preferably 1 to 70% by weight, and more preferably 1 to 50% by weight.

The coating layer may contain a pesticide active ingredient. Examples of such pesticide active ingredients include insecticidal active ingredients, bactericidal active ingredients, herbicidal active ingredients, and plant growth regulating active ingredients.
Examples of such insecticidal active ingredients include clothianidin, imidacloprid and thiamethoxam.
Examples of such bactericidal active ingredients include isothianyl and flametopil.
Examples of such herbicidal active ingredients include imazosulfone and bromobutide.
Examples of such a plant growth-regulating active ingredient include uniconazole P.
In the present invention, it is preferable to use a powdery pesticide active ingredient, and if necessary, it can be mixed with the present inorganic compound and crushed using a crusher such as a dry crusher to obtain a powdery pesticide. The average particle size of the powdered pesticide is usually 200 μm or less, preferably 150 μm or less. In the present invention, the average particle size of the powdered pesticide is the particle size measured by the laser diffraction / scattering type particle size distribution measuring device, and refers to the particle size having a cumulative frequency of 50% in the volume-based frequency distribution. The average particle size of the powdered pesticide when the powdered pesticide is a mixture with the present inorganic compound means the average particle size of the mixture. The average particle size of powdered pesticide is determined by so-called wet measurement, which is a method of measuring by dispersing particles of powdered pesticide in water using Mastersizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. be able to.
When the coating layer contains a pesticide active ingredient, its content in the rice seeds is usually 0.001 to 3% by weight, preferably 0.005 to 2% by weight, and more preferably 0.01 to 2% by weight. It is a range.

The coating layer may contain a colorant. Examples of such colorants include pigments, dyes and dyes, and among them, the use of pigments is preferable. As such a pigment, it is preferable to use a red or blue pigment, and examples thereof include Ultramarine Blue Nubic G-58 (blue pigment, manufactured by nubiola) and Toda Color 300R (red pigment, manufactured by Toda Kogyo Co., Ltd.).

These components used for producing the present rice seeds can be used separately, or all or at least two kinds of components can be mixed and used. The kit of the present invention (hereinafter referred to as the present kit) contains zinc oxide, a surfactant, and the present synthetic resin, which may be contained in one container or in two or more containers. You may. That is, the kit may include one or more containers. If the kit contains two or more containers, each container may contain different ingredients. In addition, the kit may contain other components (hereinafter referred to as component α) such as the inorganic compound and the pesticide active ingredient.

In this rice seed, a coating layer containing zinc oxide, a surfactant, and the synthetic resin (hereinafter referred to as the coating layer 1) is formed on the rice seed, or zinc oxide is added to the rice seed. It can be obtained by forming a coating layer containing a synthetic resin (hereinafter referred to as the present coating layer 2) and then holding a surfactant on the surface thereof.
The coating layer 1 is formed by adding zinc oxide, a surfactant and the synthetic resin while rolling the rice seeds, and adhering them to the rice seeds. The coating layer 2 is formed by adding zinc oxide and the synthetic resin while rolling the rice seeds, and adhering them to the rice seeds. As a device for rolling rice seeds, a device used in conventional iron coating such as a coating machine can be used. Zinc oxide, the surfactant and the present synthetic resin can be used separately, or all or at least two kinds of components can be mixed and used. When all the components are mixed and used, a powdery composition containing zinc oxide, a surfactant and the present synthetic resin is used. At this time, the form of the synthetic resin is preferably powdery. When at least two kinds of components are mixed and used, a powdery composition containing zinc oxide and a surfactant and the present synthetic resin are used, or a powdery composition containing zinc oxide and the present synthetic resin and a surfactant are used. Use with an agent. Further, when the component α is used, the component α can be used alone or can be used by adding the component α to zinc oxide.

When the form of the synthetic resin is latex, zinc oxide, a surfactant and the synthetic resin are used separately to form the coating layer 2, and then the surfactant is retained on the surface thereof. This will be described below.
While rolling the rice seeds, zinc oxide and the present synthetic resin are added separately to form the present coating layer 2 on the rice seeds. This synthetic resin acts as a binder and can attach zinc oxide to rice seeds. As the rice seeds, it is preferable that the surfactant is held at least on the surface thereof, and after forming the coating layer 2 on the rice seeds, the surfactant is added while maintaining the rolling state of the rice seeds. Then, by subjecting it to a rolling state, the surfactant adheres to the outside of the present coating layer 2, and the surfactant can be retained on the surface.

When the present inorganic compound is used, zinc oxide and the present inorganic compound can be mixed and added in the above-mentioned method, or can be added separately. When added separately, the present inorganic compound is added first, and then zinc oxide is added, so that the first layer containing the present inorganic compound and the zinc oxide provided outside the first layer are contained. It is possible to obtain this rice seed having two layers. Specifically, while rolling the rice seeds, the inorganic compound and the synthetic resin are added separately to form a first layer containing the inorganic compound and the synthetic resin, and then the rice seeds are rolled. While maintaining the moving state, zinc oxide and the present synthetic resin are added separately to form a second layer containing zinc oxide and the present synthetic resin on the outside of the first layer.

A powdery composition containing zinc oxide and the present inorganic compound (hereinafter, may be referred to as the present composition) is suitable as a powdery composition for rice seed coating. The average particle size of the composition is in the range of 0.01 to 150 μm, preferably 1 to 150 μm, and more preferably 1 to 60 μm. In the present invention, the average particle size of the present composition is a particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and refers to a particle size having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle size of the present composition is determined by a method of measuring by dispersing the particles of the present composition in water using a master sizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. be able to.
The apparent specific gravity of the present composition is in the range of 0.30 to 2.0 g / mL, preferably 0.50 to 2.0 g / mL, and more preferably 0.60 to 1.7 g / mL. It is preferable that the apparent specific gravity of the present composition is large because the amount of scattering is small during the production of coated rice seeds. In the present invention, the apparent density of the present composition is determined by a method according to the test method specified in the official pesticide test method (physical test method, Notification No. 71 of the Ministry of Agriculture and Forestry, February 3, 1960). The method is to place an 8-mesh standard sieve (a test sieve specified in Japanese Industrial Standards (JIS) Z8801-1 with a frame diameter of 200 mm and a depth of 45 mm) on a 100 mL metal cylindrical container with an inner diameter of 50 mm. Place the sample in a sieve and lightly scrape it off with a brush to fill the container. Immediately, the excess is scraped off using a slide glass and weighed, the weight of the contents is calculated, and the apparent density is calculated by the following formula. However, the distance between the sieve and the upper edge of the container is 20 cm.
Apparent specific gravity (g / mL) = weight of contents / 100

The weight ratio of zinc oxide to the inorganic compound in the composition is usually in the range of 1: 1000 to 1000: 1, preferably 1: 1000 to 100: 1, and more preferably 1: 200 to 10: 1. Considering the growth of plants and the influence on the environment, the range of 1: 200 to 1: 3 is preferable.

Some examples of this composition are shown below. In the following examples,% represents% by weight of the composition.
-A powder having an average particle size of 0.01 to 150 μm and an apparent specific gravity of 0.30 to 2.0 g / mL, which contains zinc oxide and at least one selected from the group consisting of clay, barium sulfate and calcium carbonate. State composition.
A powdery composition containing zinc oxide and at least one selected from the group consisting of clay, barium sulfate and calcium carbonate, having an average particle size of 1 to 150 μm and an apparent specific gravity of 0.50 to 2.0 g / mL. thing.
A powdery composition containing zinc oxide and at least one selected from the group consisting of clay, barium sulfate and calcium carbonate, having an average particle size of 1 to 60 μm and an apparent specific gravity of 0.60 to 1.7 g / mL. thing.
-Including zinc oxide and at least one selected from the group consisting of wax stone, barium sulfate and calcium carbonate, the average particle size is 0.01 to 150 μm, and the apparent specific gravity is 0.30 to 2.0 g / mL. Powdery composition.
-A powdery substance containing zinc oxide and at least one selected from the group consisting of wax stone, barium sulfate and calcium carbonate, having an average particle size of 1 to 150 μm and an apparent specific gravity of 0.50 to 2.0 g / mL. Composition.
-A powdery substance containing zinc oxide and at least one selected from the group consisting of wax stone, barium sulfate and calcium carbonate, having an average particle size of 1 to 60 μm and an apparent specific gravity of 0.60 to 1.7 g / mL. Composition.

A powdery composition containing zinc oxide and calcium carbonate, having an average particle size of 1 to 60 μm and an apparent specific gravity of 0.60 to 1.7 g / mL.
A powdery composition containing 0.5 to 30% zinc oxide and 70 to 99.5% calcium carbonate, having an average particle size of 5 to 50 μm and an apparent specific gravity of 0.80 to 1.5 g / mL.
A powdery composition containing 1 to 25% zinc oxide and 75 to 99% calcium carbonate, having an average particle size of 15 to 45 μm and an apparent specific gravity of 1.0 to 1.3 g / mL.
A powdery composition composed of 25% zinc oxide and 75% calcium carbonate, having an average particle size of 21.5 μm and an apparent specific gravity of 1.02 g / mL.
A powdery composition composed of 10% zinc oxide and 90% calcium carbonate, having an average particle size of 30.0 μm and an apparent specific gravity of 1.20 g / mL.
A powdery composition composed of 1% zinc oxide and 99% calcium carbonate, having an average particle size of 41.4 μm and an apparent specific gravity of 1.3 g / L.

A powdery composition containing zinc oxide and clay, having an average particle size of 1 to 60 μm and an apparent specific gravity of 0.60 to 1.7 g / mL.
A powdery composition containing zinc oxide and pyrophyllite, having an average particle size of 1 to 60 μm and an apparent specific gravity of 0.60 to 1.7 g / mL.
A powdery composition containing 40 to 95% zinc oxide and 5 to 60% pyrophyllite, having an average particle size of 1 to 15 μm and an apparent specific gravity of 0.60 to 1.0 g / mL.
A powdery composition composed of 90% zinc oxide and 10% pyrophyllite, having an average particle size of 10.3 μm and an apparent specific gravity of 0.94 g / mL.
A powdery composition composed of 50% zinc oxide and 50% pyrophyllite, having an average particle size of 3.3 μm and an apparent specific gravity of 0.66 g / mL.

A powdery composition containing zinc oxide and barium sulfate, having an average particle size of 1 to 60 μm and an apparent specific gravity of 0.60 to 1.7 g / mL.
A powdery composition containing 10 to 60% zinc oxide and 40 to 90% barium sulfate, having an average particle size of 1 to 20 μm and an apparent specific gravity of 0.8 to 1.2 g / mL.
A powdery composition composed of 20% zinc oxide and 80% barium sulfate, having an average particle size of 10.5 μm and an apparent specific gravity of 1.07 g / mL.
A powdery composition comprising 50% zinc oxide and 50% barium sulfate, having an average particle size of 1.6 μm and an apparent specific gravity of 0.87 g / mL.

Further, when the form of the synthetic resin is powdery, the composition may contain the synthetic resin. Some examples of the composition comprising the synthetic resin are shown below. In the following examples,% represents% by weight of the composition.
-A powdery composition containing zinc oxide, calcium carbonate, and at least one selected from the group consisting of an acrylic resin and a vinyl acetate resin.
-A powdery composition containing zinc oxide, calcium carbonate and an acrylic resin.
-A powdery composition containing zinc oxide, calcium carbonate and vinyl acetate resin.
-A powdery composition containing zinc oxide, calcium carbonate and an acrylic resin and having an apparent specific gravity of 0.60 to 1.7 g / mL.
-A powdery composition containing zinc oxide, calcium carbonate and vinyl acetate resin, having an apparent specific gravity of 0.60 to 1.7 g / mL.
-A powdery composition containing 0.1 to 5% zinc oxide, 90 to 98% calcium carbonate and 1.9 to 5% acrylic resin, and having an apparent specific gravity of 1.0 to 1.5 g / mL.
A powdery composition comprising 1.0% zinc oxide, 95.2% calcium carbonate and 3.8% acrylic resin, having an average particle size of 40.1 μm and an apparent specific gravity of 1.31 g / mL.
A powdery composition comprising 4.8% zinc oxide, 91.4% calcium carbonate and 3.8% acrylic resin, having an average particle size of 35.0 μm and an apparent specific gravity of 1.18 g / mL.
In the above example, the acrylic resin is preferably a copolymer of an acrylic acid alkyl ester and a methacrylate alkyl ester, and the vinyl acetate resin is a copolymer of vinyl acetate, vinyl versatic acid and an acrylic acid alkyl ester. Is preferable.

A method for producing the rice seeds (hereinafter referred to as the present production method) will be described. In this production method, rice seeds are usually used after being soaked. Soaking can be carried out as follows. First, put the dried rice seeds in a bag such as a paddy bag and soak them in water. In order to obtain coated rice seeds with a high germination rate, it is desirable to soak for 3 to 4 days at a water temperature of 15 to 20 ° C. After removing the rice seeds from the water, the excess water on the surface is usually removed by allowing the rice seeds to stand or to be dehydrated.

First, a method for producing coated rice seeds having the present coating layer 2 and having a surfactant retained on the surface thereof (hereinafter referred to as the present production method 1) will be described. The present manufacturing method 1 has the following steps.
(1) A step of adding the aqueous dispersion of the present synthetic resin and zinc oxide while rolling the rice seeds to form the present coating layer 2, (2) the seeds obtained in the above step (1). A step of adding a surfactant while rolling to hold the surfactant on the outside of the main coating layer 2 formed in the step (1), and (3) seeds obtained in the step (2). The process of drying.
In the present production method 1, first, while rolling the soaked rice seeds, an aqueous dispersion of the present synthetic resin and zinc oxide are added to form the present coating layer 2 (hereinafter referred to as step 1). ). As the aqueous dispersion of the synthetic resin, the synthetic resin commercially available in the form of latex can be diluted with water and used as needed. In step 1, an aqueous dispersion of the synthetic resin (hereinafter referred to as the latex) may be added, and then zinc oxide may be added, or the order may be reversed. Further, the present latex and zinc oxide may be added at the same time. Both zinc oxide and this latex are added so as to be applied to the rice seeds in the rolling state. The latex is usually used in the range of the synthetic resin content of usually 20 to 65%, preferably 30 to 60%, more preferably 30 to 40% (all by weight with respect to the latex). The method for adding the latex may be either dropping or spraying. After adding the present latex and zinc oxide, the rolling state of the rice seeds is maintained, and zinc oxide is attached to the rice seeds using the present latex as a binder.
The total amount of zinc oxide added in the present production method 1 is usually in the range of 5 to 400 parts by weight, preferably 5 to 200 parts by weight, and more preferably 10 to 100 parts by weight with respect to 100 parts by weight of dried rice seeds. .. Considering the growth of plants and the influence on the environment, the range of 10 to 25 parts by weight is preferable. The total amount of the synthetic resin added is usually in the range of 0.025 to 25 parts by weight, preferably 0.05 to 8 parts by weight, and more preferably 0.1 to 4 parts by weight with respect to 100 parts by weight of dried rice seeds. Is. The weight ratio of the synthetic resin to zinc oxide is usually in the range of 1: 200 to 1:10, preferably 1: 100 to 1:25.

In step 1, zinc oxide and the present synthetic resin are added separately, and step 1 is repeated to form a uniform coating layer. In that case, the amount of zinc oxide added at one time is usually about 1 to 1/10, preferably about 1/2 to 1/5 of the total amount of zinc oxide added. The amount of the synthetic resin added once may be changed depending on the state of the coating, but is usually 1 to 1/10, preferably about 1/2 to 1/5 of the total amount of the synthetic resin added. be. In the present invention, the one-time addition amount of the present synthetic resin means the amount of the present synthetic resin required for the one-time addition amount of the zinc oxide to adhere to the rice seeds. It is not necessary to add zinc oxide and the present synthetic resin alternately, and either of them may be added depending on the state of the coating. Further, if necessary, only water can be added. The total amount of water added is usually 1/2 to 1/100, preferably about 1/3 to 1/10 of the total amount of zinc oxide added. However, the total amount of water added also includes water used for diluting the present latex.
When zinc oxide adheres to the inner wall of the apparatus in step 1, it can be scraped off with a scraper or the like to attach substantially the entire amount of the added zinc oxide to the rice seeds.

After carrying out step 1, a step of adding a surfactant while rolling the seeds obtained in step 1 to hold the surfactant on the outside of the present coating layer 2 formed in step 1 (hereinafter referred to as “)”. Step 2) is carried out. In step 2, after carrying out step 1, a surfactant is added while maintaining the rolling state of the rice seeds, and the surface active agent is kept on the outside of the present coating layer 2 by subjecting the rice seeds to the rolling state. Can be made to.

After carrying out the step 2, the step of drying the seeds obtained in the step 2 is carried out to obtain the present rice seeds. Specifically, after carrying out step 2, the rice seeds are taken out from the apparatus, placed in a seedling box, spread thinly, and allowed to stand to dry. Usually, it is dried until the water content is 20% or less (% by weight with respect to the coated rice seeds). In the present invention, the water content of coated rice seeds means a value measured by drying 10 g of a sample at 105 ° C. for 1 hour using an infrared moisture meter. As the infrared moisture meter, FD-610 manufactured by Kett Science Institute Headquarters can be used. Further, instead of the seedling box, a goza or a vinyl sheet may be used, spread thinly on the seedling box, and dried.

Next, a method for producing coated rice seeds having a coating layer containing zinc oxide, the synthetic resin, and the inorganic compound and having a surfactant retained on the surface thereof (hereinafter referred to as the production method 2). ) Will be explained. The present manufacturing method 2 has the following steps.
(1) A step of adding the present latex, the present inorganic compound, and zinc oxide while rolling rice seeds to form a coating layer containing the present synthetic resin, the present inorganic compound, and zinc oxide. 2) A step of adding a surfactant while rolling the seeds obtained in the step (1) to hold the surfactant on the outside of the layer formed in the step (1), and (3). A step of drying the seeds obtained in the step (2).
The present production method 2 is the same method as the present production method 1 except that a powdery composition containing zinc oxide and the present inorganic compound (hereinafter referred to as powdery composition Z) is used instead of zinc oxide. Is.
The total amount of zinc oxide added in the present production method 2 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, and more preferably 0.1 to 50 parts by weight with respect to 100 parts by weight of dried rice seeds. It is in the range of parts by weight. Considering the growth of plants and the influence on the environment, the range of 0.1 to 25 parts by weight is preferable. The total amount of the inorganic compound added is usually in the range of 1-99.9 parts by weight, preferably 1 to 199.9 parts by weight, and more preferably 1 to 99.9 parts by weight with respect to 100 parts by weight of dried rice seeds. Is. The total amount of the powdery composition Z added is usually in the range of 5 to 400 parts by weight, preferably 5 to 200 parts by weight, and more preferably 10 to 100 parts by weight with respect to 100 parts by weight of the dried rice seeds. The total amount of the synthetic resin added is usually in the range of 0.025 to 25 parts by weight, preferably 0.05 to 8 parts by weight, and more preferably 0.1 to 4 parts by weight with respect to 100 parts by weight of dried rice seeds. Is. The weight ratio of the synthetic resin to the powdery composition Z is usually in the range of 1: 200 to 1:10, preferably 1: 100 to 1:25.

Finally, it has a coating layer containing zinc oxide, the synthetic resin and the inorganic compound, and the coating layer is formed on the first layer containing the inorganic compound and the synthetic resin and on the outside of the first layer. A method for producing coated rice seeds having a second layer containing the provided zinc oxide and the present synthetic resin and having a surfactant retained on the surface thereof (hereinafter referred to as the present production method 3) will be described. The manufacturing method 3 has the following steps.
(1) (I) A step of adding the present latex and the present inorganic compound while rolling rice seeds to form a coating layer containing the present synthetic resin and the present inorganic compound, and (II) the above-mentioned step. While rolling the seeds obtained in (I), the present latex and zinc oxide are added, and a coating layer containing the present synthetic resin and zinc oxide is added to the outside of the layer formed in the step (I). (2) While rolling the seeds obtained in the step (1), a surfactant is added to hold the surfactant on the outside of the layer formed in the step (1). Steps and (3) a step of drying the seeds obtained in the step (2).
In the present production method 3, first, while rolling the soaked rice seeds, the present latex and the present inorganic compound are added to form a coating layer containing the present synthetic resin and the present inorganic compound (hereinafter,). , Step I). Step I can be carried out in the same manner as in step 1 of the present production method 1 except that the present inorganic compound is used instead of zinc oxide. After performing step I, while rolling the seeds obtained in step I, the present latex and zinc oxide are added, and the synthetic resin and zinc oxide are placed on the outside of the layer formed in step I. A step of forming the including coating layer (hereinafter referred to as step II) is carried out. Step II can be carried out in the same manner as Step 1 of the present manufacturing method 1.
The total amount of the inorganic compound added in the production method 3 is usually in the range of 5 to 400 parts by weight, preferably 5 to 200 parts by weight, and more preferably 10 to 100 parts by weight with respect to 100 parts by weight of dried rice seeds. be. The total amount of zinc oxide added is usually in the range of 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, and more preferably 0.1 to 50 parts by weight with respect to 100 parts by weight of dried rice seeds. be. Considering the growth of plants and the influence on the environment, the range of 0.1 to 25 parts by weight is preferable. The total amount of the synthetic resin added is usually in the range of 0.025 to 25 parts by weight, preferably 0.05 to 8 parts by weight, and more preferably 0.1 to 4 parts by weight with respect to 100 parts by weight of dried rice seeds. Is. The weight ratio of the total amount of the synthetic resin added to the total amount of zinc oxide added and the total amount of the inorganic compound added is usually 1: 200 to 1:10, preferably 1: 100 to 1: 1. It is in the range of 25.
After the step II is carried out, the steps 2 and subsequent steps of the present manufacturing method 1 may be carried out in the same manner.

The rice seeds can be used in direct sowing cultivation of paddy rice, and the method is carried out by sowing the rice seeds directly in the paddy field. In the present invention, the paddy field refers to either a flooded paddy field or a flooded paddy field. Specifically, the method described in "Iron Coating Flooded Direct Sowing Manual 2010" (Minoru Yamauchi, Incorporated Administrative Agency Agricultural and Food Industry Technology Research Organization Kinki Chugoku-Shikoku Agricultural Research Center, March 2010, Non-Patent Document 1) Sow according to. At that time, a direct seeding machine for iron coating such as Tetsumaki-chan (manufactured by Kubota Co., Ltd.) may be used. Good seedlings are achieved by sowing by the usual method in this way. After that, rice can be grown by keeping the cultivation conditions under normal conditions.
In addition, pesticides and fertilizers may be applied before sowing, at the same time as sowing, or after sowing. Examples of such pesticides include fungicides, insecticides, herbicides and the like.

The present invention will be described in more detail by way of examples.

First, a production example and a comparative production example are shown.

In the following production examples and comparative production examples, unless otherwise specified, rice seeds were Hinohikari seeds, and production was carried out at room temperature (about 20 ° C.). Further,% represents weight%.
The product names described in the production example and the comparative production example are as follows.
Zinc oxide 3N5: Zinc oxide, manufactured by Kanto Chemical Co., Inc., average particle size; 7.7 μm
Zinc oxide type: Zinc oxide, manufactured by Nippon Chemical Industrial Co., Ltd., average particle size; 0.26 μm
Two types of zinc oxide: zinc oxide, manufactured by Nippon Chemical Industrial Co., Ltd., average particle size; 0.24 μm
For tankal granules: calcium carbonate, manufactured by Yakusen Lime Co., Ltd., average particle size; 6.2 μm
Calcium carbonate G-100: Calcium carbonate, manufactured by Sankyo Seiko Co., Ltd., average particle size; 46.0 μm
SS # 80: Calcium carbonate, manufactured by Nitto Powder Industry Co., Ltd., average particle size; 4.6 μm
Baryte: barium sulfate, manufactured by Neolite Kosan Co., Ltd., average grain size; 12.4 μm
Katsumitsuyama Clay S: Rouseki, manufactured by Katsumitsuyama Mining Co., Ltd., average particle size; 6.7 μm
DL for clay powder: Rouseki, manufactured by Katsukoyama Mining Co., Ltd., average particle size; 30.3 μm
Rutile flower: Titanium oxide, manufactured by Kinsei Matek Co., Ltd., average particle size; 14.6 μm
Sun Zeolite MGF: Zeolite, Sun Zeolite Industry Co., Ltd., Average particle size; 116 μm
Magnesium oxide: Magnesium oxide, Wako Pure Chemical Industries, Ltd., average particle size; 14.9 μm
DAE1K: Iron powder, made by DOWA IP Creation KTS-1: Grilled gypsum, manufactured by Yoshino Gypsum Sales Co., Ltd. Mainyl-Powerder DM2072P: Copolymer of vinyl acetate, vinyl versatic acid and alkyl ester of acrylic acid, Tg; 14 ° C., synthetic Resin content: 85%, Motorcycle-Powerer LDM7000P manufactured by Nippon Synthetic Chemical Industry Co., Ltd .: Copolymer of acrylic acid alkyl ester and methacrylate alkyl ester, Tg; 8 ° C., Synthetic resin content: 85%, Nippon Synthetic Chemical Industry Co., Ltd. Company's Movinyl 6485: Copolymer of acrylic acid alkyl ester and styrene, Tg; -22 ° C, synthetic resin content; 55%, Narustar SR140 manufactured by Nippon Synthetic Chemical Industry Co., Ltd .: carboxylated butadiene-styrene-methacrylic acid Methyl copolymer, Tg; -12 ° C, synthetic resin content; 48.5%, Sumikaflex 808HQ manufactured by Nippon A & L Co., Ltd .: Copolymer of ethylene, vinyl acetate and vinyl chloride, Tg; 25 ° C, synthetic resin content 50%, Superflex 500M manufactured by Sumika Chemtex Co., Ltd .: Urethane resin obtained by polymerizing an aliphatic isocyanate and a polyester polyol, Tg; -39 ° C, synthetic resin content; 45%, Solpol manufactured by Daiichi Kogyo Seiyaku Co., Ltd. 5080: Polyoxyethylene tristyrylphenyl ether, manufactured by Toho Kagaku Kogyo Co., Ltd.

Production Example 1
First, a simple seed coating machine capable of coating when the amount of rice seeds used was small was prepared. As shown in FIG. 1, a polyethylene cup 2 having a capacity of 500 mL is attached to the tip of the shaft 1, and the polyethylene cup 2 has a capacity of 500 mL. A simple seed coating machine was produced by tilting the stirrer 3 and attaching it to the stand 4.
Next, 10.0 g of zinc oxide 3N5 and 0.2 g of Moonyl-Powerder DM2072P were mixed to obtain a powdery composition (1).
About 100 mL of water was put into a polyethylene cup having a capacity of 200 mL, 20 g of dried rice seeds was put into the cup, and the seeds were soaked for 10 minutes. Then, the rice seeds were taken out of the water, the excess water on the surface was removed, and then the rice seeds were put into a polyethylene cup 2 attached to the prepared simple seed coating machine. The rice seeds are rolled by operating the simple seed coating machine in the range of the rotation speed of the stirrer 3 in the range of 130 to 140 rpm, and the powdery composition (1) 1 / 10.2 g while spraying water on the rice seeds by spraying. About 4 amounts (about 2.5 g) were added and attached to rice seeds. When the powdery composition (1) adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula to attach substantially the entire amount of the powdery composition (1) added at one time to the rice seeds. .. Then, by repeating the same operation three times, 10.2 g of the powdery composition (1) was adhered to the rice seeds to form a coating layer. The total amount of water used for coating was 2.7 g. Next, the simple seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 0.1 g of Solpol 5080 was added and adhered to the outside of the coating layer. The rice seeds taken out from the simple seed coating machine were spread on a stainless steel vat so as not to overlap with each other, and dried overnight to obtain the coated rice seeds (1) of the present invention.

Manufacturing example 2
0.22 g of Superflex 500M and 0.19 g of water were mixed to obtain 0.41 g of Superflex 500M water diluted solution.
The following operation was performed according to the method described in Production Example 1. After soaking 20 g of dried rice seeds, roll them using a simple seed coating machine, and use a dropper to apply a quarter amount (about 0.1 g) of 0.41 g of Superflex 500M water diluted solution to the rice seeds. About 1/4 of the amount of 1 g of zinc oxide (about 0.25 g) was added to the rice seeds. When one type of zinc oxide adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula to attach substantially the entire amount of one type of zinc oxide added at one time to the rice seeds. Then, by repeating the same operation three times, 1 g of zinc oxide type was attached to the rice seeds to form a coating layer. The total amount of water used for coating was 0.5 g. Next, the simple seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 0.1 g of Solpol 5080 was added and adhered to the outside of the coating layer. The rice seeds taken out from the simple seed coating machine were spread on a stainless steel vat so as not to overlap with each other, and dried overnight to obtain the coated rice seeds (2) of the present invention.

Production example 3
0.2 g of Sumikaflex 808HQ and 0.2 g of water were mixed to obtain 0.4 g of a diluted solution of Sumikaflex 808HQ water.
The following operation was performed according to the method described in Production Example 2. Using 0.4 g of the above-mentioned Sumikaflex 808HQ water-diluted solution instead of 0.41 g of Superflex 500M water-diluted solution, add 0.4 g of Sumikaflex 808HQ water-diluted solution and 1 g of zinc oxide in 4 divided portions. After forming a coating layer, the coated rice seed (3) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside thereof. The total amount of water used for coating was 0.4 g.

Production example 4
The powdery composition (2) was obtained by mixing 5.0 g of two kinds of zinc oxide, 15.0 g of calcium carbonate G-100 and 0.4 g of Moulinyl-Poder LDM7000P. The powdery composition (2) had an average particle size of 34.1 μm and an apparent specific gravity of 0.96 g / mL.
The following operation was performed according to the method described in Production Example 1. Instead of 10.2 g of the powdery composition (1), 20.4 g of the above powdery composition (2) was used, and the coating layer was formed by adding the powdery composition (2) in four portions, and then on the outside thereof. By attaching 0.2 g of Solpol 5080, the coated rice seed (4) of the present invention was obtained. The total amount of water used for coating was 2.8 g.

Production Example 5
The powdery composition (3) was obtained by mixing 0.1 g of two kinds of zinc oxide, 9.9 g of calcium carbonate G-100 and 0.4 g of Moulinyl-Poder LDM7000P. The powdery composition (3) had an average particle size of 40.1 μm and an apparent specific gravity of 1.31 g / mL.
The following operation was performed according to the method described in Production Example 1. 10.4 g of the above powdery composition (3) was used instead of 10.2 g of the powdery composition (1), and the coating layer was formed by adding the powdery composition (3) in four portions, and then on the outside thereof. By attaching 0.4 g of Solpol 5080, the coated rice seed (5) of the present invention was obtained. The total amount of water used for coating was 1.1 g.

Production Example 6
The powdery composition (4) was obtained by mixing 0.5 g of two kinds of zinc oxide, 9.5 g of calcium carbonate G-100 and 0.4 g of Moulinyl-Poder LDM7000P. The powdery composition (4) had an average particle size of 35.0 μm and an apparent specific gravity of 1.18 g / mL.
The following operation was performed according to the method described in Production Example 1. 10.4 g of the above powdery composition (4) was used instead of 10.2 g of the powdery composition (1), and the coating layer was formed by adding the powdery composition (4) in four portions, and then on the outside thereof. By attaching 0.4 g of Solpol 5080, the coated rice seed (6) of the present invention was obtained. The total amount of water used for coating was 1.6 g.

Production example 7
The powdery composition (5) was obtained by mixing 0.1 g of two kinds of zinc oxide, 4.9 g of calcium carbonate G-100, 5.0 g of barite and 0.4 g of Moulinyl-Poder LDM7000P. The powdery composition (5) had an average particle size of 26.0 μm and an apparent specific gravity of 1.43 g / mL.
The following operation was performed according to the method described in Production Example 1. 10.4 g of the above powdery composition (5) was used instead of 10.2 g of the powdery composition (1), and the coating layer was formed by adding the powdery composition (5) in four portions, and then on the outside thereof. By attaching 0.4 g of Solpol 5080, the coated rice seed (7) of the present invention was obtained. The total amount of water used for coating was 1.2 g.

Production Example 8
2.5 g of zinc oxide type and 7.5 g of calcium carbonate G-100 were mixed to obtain a powdery composition (6). The powdery composition (6) had an average particle size of 21.5 μm and an apparent specific gravity of 1.02 g / mL.
Further, 0.36 g of Movinyl 6485 and 0.57 g of water were mixed to obtain 0.93 g of a diluted solution of Movinyl 6485 in water.
The following operation was performed according to the method described in Production Example 2. 10 g of the above-mentioned powdery composition (6) was used in place of 1 g of zinc oxide, and 0.93 g of the above-mentioned Movinyl 6485 water-diluted solution was used in place of 0.41 g of Superflex 500M water-diluted solution. The coated rice seed (8) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 1.3 g.

Production Example 9
5.0 g of zinc oxide 3N5 and 5.0 g for tankal granules were mixed to obtain a powdery composition (7). The powdery composition (7) had an average particle size of 9.47 μm and an apparent specific gravity of 0.97 g / mL.
Further, 0.41 g of Nalstar SR140 and 0.26 g of water were mixed to obtain 0.67 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (7) was used in place of 1 g of zinc oxide, and 0.67 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (9) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 2.5 g.

Production Example 10
10.0 g of zinc oxide 3N5, 2.5 g of SS # 80 and 7.5 g of calcium carbonate G-100 were mixed to obtain a powdery composition (8). The powdery composition (8) had an average particle size of 14.6 μm and an apparent specific gravity of 1.03 g / mL.
Further, 0.82 g of Nalstar SR140 and 0.31 g of water were mixed to obtain 1.13 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 20 g of the above powdery composition (8) was used in place of 1 g of zinc oxide, and 1.13 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (10) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 3.3 g.

Production Example 11
20.0 g of zinc oxide 3N5, 5.0 g of SS # 80 and 15.0 g of calcium carbonate G-100 were mixed to obtain a powdery composition (9). The powdery composition (9) had an average particle size of 14.6 μm and an apparent specific gravity of 1.03 g / mL.
Further, 1.65 g of Nalstar SR140 and 0.27 g of water were mixed to obtain 1.92 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 40 g of the above powdery composition (9) was used in place of 1 g of zinc oxide, and 1.92 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (11) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 7.9 g.

Production Example 12
0.82 g of Nalstar SR140 and 0.37 g of water were mixed to obtain 1.19 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 9. Using 1.19 g of the above Nalster SR140 aqueous diluent in place of 0.67 g of the Nalstar SR140 aqueous diluent, and adding 10 g of the powdery composition (7) in four portions to form a coating layer. Then, 0.1 g of Solpol 5080 was attached to the outside thereof to obtain the coated rice seed (12) of the present invention. The total amount of water used for coating was 1.3 g.

Production Example 13
0.41 g of Nalstar SR140 and 0.36 g of water were mixed to obtain 0.77 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 9. Using 0.77 g of the above Nalster SR140 aqueous diluent in place of 0.67 g of the Nalstar SR140 aqueous diluent, and adding 10 g of the powdery composition (7) in four portions to form a coating layer. Then, 0.2 g of Solpol 5080 was attached to the outside thereof to obtain the coated rice seed (13) of the present invention. The total amount of water used for coating was 2.5 g.

Production Example 14
A powdery composition (10) was obtained by mixing 5.0 g of zinc oxide 3N5, 5.0 g for tankal granules and 0.2 g of Solpol 5080.
Further, 0.82 g of Nalstar SR140 and 0.24 g of water were mixed to obtain 1.06 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10.2 g of the above powdery composition (10) was used in place of 1 g of zinc oxide, and 1.06 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution. The coated rice seed (14) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming a coating layer by performing an operation of adding in 4 portions. The total amount of water used for coating was 1.6 g.

Production Example 15
8.0 g of zinc oxide 3N5 and 2.0 g of barite were mixed to obtain a powdery composition (11). The powdery composition (11) had an average particle size of 10.5 μm and an apparent specific gravity of 1.07 g / mL.
Further, 0.41 g of Nalster SR140 and 0.22 g of water were mixed to obtain 0.63 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (11) was used in place of 1 g of zinc oxide, and 0.63 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (15) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 2.0 g.

Production Example 16
9.0 g of zinc oxide 3N5 and 1.0 g of Katsumitsuyama clay S were mixed to obtain a powdery composition (12). The powdery composition (12) had an average particle size of 10.3 μm and an apparent specific gravity of 0.94 g / mL.
Further, 0.41 g of Nalstar SR140 and 0.45 g of water were mixed to obtain 0.86 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (12) was used in place of 1 g of zinc oxide, and 0.86 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (16) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 2.4 g.

Production Example 17
1.0 g of zinc oxide and 9.0 g of rutile flower were mixed to obtain a powdery composition (13). The average particle size of the powdery composition (13) was 8.6 μm.
Further, 0.41 g of Nalstar SR140 and 0.47 g of water were mixed to obtain 0.89 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (13) was used in place of 1 g of zinc oxide, and 0.89 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (17) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 1.1 g.

Production Example 18
5.0 g of two kinds of zinc oxide and 5.0 g of barite were mixed to obtain a powdery composition (14). The powdery composition (14) had an average particle size of 1.6 μm and an apparent specific gravity of 0.87 g / mL.
Further, 0.41 g of Nalster SR140 and 0.98 g of water were mixed to obtain 1.39 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (14) was used in place of 1 g of zinc oxide, and 1.39 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (18) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 1.6 g.

Production Example 19
5.0 g of two kinds of zinc oxide and 5.0 g of rutile flower were mixed to obtain a powdery composition (15). The average particle size of the powdery composition (15) was 1.6 μm.
Further, 0.41 g of Nalstar SR140 and 0.99 g of water were mixed to obtain 1.4 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (15) was used in place of 1 g of zinc oxide, and 1.4 g of the above Nalster SR140 aqueous diluted solution was used in place of 0.41 g of Superflex 500 M aqueous diluted solution, and each of them was divided into four parts. The coated rice seed (19) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 1.7 g.

Production Example 20
5.0 g of two kinds of zinc oxide and 5.0 g of Katsumitsuyama clay S were mixed to obtain a powdery composition (16). The powdery composition (16) had an average particle size of 3.3 μm and an apparent specific gravity of 0.67 g / mL.
0.41 g of Nalstar SR140 and 0.99 g of water were mixed to obtain 1.4 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (16) was used in place of 1 g of zinc oxide, and 1.4 g of the above Nalster SR140 aqueous diluted solution was used in place of 0.41 g of Superflex 500 M aqueous diluted solution, and each of them was divided into four parts. The coated rice seed (20) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 2.24 g.

Production Example 21
5.0 g of two kinds of zinc oxide and 5.0 g of DL for clay powder were mixed to obtain a powdery composition (17). The average particle size of the powdery composition (17) was 16.9 μm.
Further, 0.41 g of Nalstar SR140 and 0.99 g of water were mixed to obtain 1.4 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (17) was used in place of 1 g of zinc oxide, and 1.4 g of the above Nalster SR140 aqueous diluted solution was used in place of 0.41 g of Superflex 500 M aqueous diluted solution, and each of them was divided into four parts. The coated rice seed (21) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 1.87 g.

Production Example 22
5.0 g of two kinds of zinc oxide and 5.0 g of sun zeolite MGF were mixed to obtain a powdery composition (18). The average particle size of the powdery composition (18) was 45.0 μm.
Further, 0.41 g of Nalster SR140 and 1.25 g of water were mixed to obtain 1.66 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above-mentioned powdery composition (18) was used in place of 1 g of zinc oxide, and 1.66 g of the above-mentioned Nalstar SR140 water-diluted solution was used in place of 0.41 g of Superflex 500M water-diluted solution. The coated rice seed (22) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 3.29 g.

Production Example 23
Two kinds of zinc oxide (5.0 g) and magnesium oxide (5.0 g) were mixed to obtain a powdery composition (19). The average particle size of the powdery composition (19) was 5.0 μm.
Further, 0.41 g of Nalstar SR140 and 1.19 g of water were mixed to obtain 1.6 g of Nalstar SR140 aqueous diluted solution.
The following operation was performed according to the method described in Production Example 2. 10 g of the above powdery composition (19) was used in place of 1 g of zinc oxide, and 1.6 g of the above Nalster SR140 water diluted solution was used in place of 0.41 g of Superflex 500 M water diluted solution, and each of them was divided into four parts. The coated rice seed (23) of the present invention was obtained by adhering 0.1 g of Solpol 5080 to the outside of the coating layer after forming the coating layer. The total amount of water used for coating was 3.5 g.

Production Example 24
2.5 g of SS # 80 and 7.5 g of calcium carbonate G-100 were mixed to obtain a calcium carbonate mixture A.
Further, 0.41 g of Nalstar SR140 and 0.21 g of water are mixed to obtain 0.62 g of Nalstar SR140 aqueous diluted solution (hereinafter referred to as diluted solution A), and 0.41 g of Nalstar SR140 and 0.26 g of water are mixed to obtain Nalstar. 0.67 g of SR140 aqueous diluted solution (hereinafter referred to as diluted solution B) was obtained.
The following operation was performed according to the method described in Production Example 1. After soaking 20 g of dried rice seeds, they are rolled using a simple seed coating machine, and about 1/4 of the diluted solution A (about 0.15 g) is dropped onto the rice seeds using a dropper to carbonize the rice. About 1/4 of the calcium mixture A (about 2.5 g) was added and attached to rice seeds. When the calcium carbonate mixture A adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula to attach substantially the entire amount of the calcium carbonate mixture A added at one time to the rice seeds. Then, by repeating the same operation three times, 10 g of the calcium carbonate mixture A was attached to the rice seeds to form a first coating layer containing calcium carbonate (hereinafter referred to as the first layer). The total amount of water used for coating was 0.9 g.
Next, the simple seed coating machine was kept operating to maintain the rolling state of the rice seeds, and about 1/4 of the diluted solution B (about 0.17 g) was dropped onto the rice seeds using a dropper. However, an amount (about 2.5 g) of about 1/4 of 10 g of zinc oxide 3N5 was added and adhered to the outside of the first layer. When zinc oxide 3N5 adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula to attach substantially the entire amount of zinc oxide 3N5 added at one time to the rice seeds. After that, by repeating the same operation three times, 10 g of zinc oxide 3N5 is adhered to the outside of the first layer, and the second coating layer containing zinc oxide (hereinafter referred to as the second layer) is attached to the outside of the first layer. (Note) was formed. The total amount of water used for coating was 4.8 g.
Next, the simple seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 0.1 g of Solpol 5080 was added and adhered to the outside of the second layer. The rice seeds taken out from the simple seed coating machine were spread so as not to overlap with a stainless steel vat and dried overnight to obtain the coated rice seeds (24) of the present invention.

Production Example 25
After mixing 70.0 parts by weight of clothianidin and 30.0 parts by weight of Katsumitsuyama clay S, the mixture was pulverized with a centrifugal pulverizer to obtain powdered pesticide A. The average particle size of the powdered pesticide A was 13.0 μm. 5.0 g of tankal granules and 0.086 g of powdered pesticide A were mixed to obtain a calcium carbonate mixture B.
Further, 0.21 g of Nalstar SR140 and 0.35 g of water are mixed to obtain 0.56 g of Nalstar SR140 aqueous diluted solution (hereinafter referred to as diluted solution C), and 0.21 g of Nalstar SR140 and 0.35 g of water are mixed to obtain Nalstar. 0.56 g of SR140 aqueous diluted solution (hereinafter referred to as diluted solution D) was obtained.
The following operation was performed according to the method described in Production Example 24. 5.086 g of the above-mentioned calcium carbonate mixture B was used instead of 10 g of the calcium carbonate mixture A, and the above-mentioned diluted solution C was used instead of the diluted solution A. Formed a layer. The total amount of water used for coating was 0.4 g.
Next, the above-mentioned diluted solution D was used instead of the diluted solution B, the amount of zinc oxide 3N5 was adjusted to 5 g, and the operation of adding them in 4 portions was performed to form the second layer. The total amount of water used for coating was 2.4 g. Finally, 0.1 g of Solpol 5080 was attached to the outside of the second layer to obtain the coated rice seed (25) of the present invention.

Production Example 26
After mixing 70.0 parts by weight of isothianil and 30.0 parts by weight of Katsumitsuyama Clay S, the mixture was pulverized with a centrifugal pulverizer to obtain powdered pesticide B. The average particle size of the powdered pesticide B was 6.8 μm. The powdery pesticide A obtained in Production Example 25 (8.73 g), zinc oxide 3N5 (500.0 g) and powdery pesticide B (11.6 g) were mixed to obtain a powdery pesticide (20). The average particle size of the powdery composition (20) was 8.4 μm.
Further, 20.6 g of Nalstar SR140 and 5.0 g of water were mixed to obtain 25.6 g of Nalstar SR140 aqueous diluted solution.
About 5 L of water was put into a polyethylene bucket, 1 kg of dried rice seeds (Koshihikari) was put into the bucket, and the seeds were soaked at about 10 ° C. for 2 nights. Then, the rice seeds were taken out of the water and allowed to stand to remove excess water on the surface, and then put into a drum of a seed coating machine (KC-151, manufactured by Keibunsha Seisakusho). The tilt angle (elevation angle) of the drum was adjusted to be 45 degrees. The rice seeds are rolled by operating the seed coating machine (drum rotation speed; 21.9 rpm), and the amount of rice (about 6.4 g), which is about 1/4 of the 25.6 g of Narstar SR140 water diluted solution, is sprayed. While spraying the seeds, about 1/4 of the powdery composition (20) 520.33 g (about 130.1 g) was added and attached to the rice seeds. When the powdery composition (20) adhered to the inner wall of the drum, it was scraped off using a dustpan to attach substantially the entire amount of the powdery composition (20) added at one time to the rice seeds. Then, by repeating the same operation three times, 520.33 g of the powdery composition (20) was adhered to the rice seeds to form a coating layer. The total amount of water used for coating was 5.0 g. Next, the seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 5.0 g of Solpol 5080 was added and adhered to the outside of the coating layer. The rice seeds taken out from the seed coating machine were spread so as not to overlap the seedling box and dried overnight to obtain the coated rice seeds (26) of the present invention.

Comparative manufacturing example 1
10 g of DAE1K and 1 g of KTS-1 were mixed to obtain 11 g of an iron mixture.
The following operation was performed according to the method described in Production Example 1. After soaking 20 g of dried rice seeds, they are rolled using a simple seed coating machine, and while spraying water on the rice seeds using a dropper, the amount is about 1/4 of 11 g of the iron mixture A (about 2.8 g). Was added and attached to rice seeds. When the iron mixture A adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula to attach substantially the entire amount of the iron mixture A added at one time to the rice seeds. Then, by repeating the same operation three times, 11 g of the iron mixture A was adhered to the rice seeds to form a coating layer. The total amount of water used for coating was 1.9 g. Next, the simple seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 0.5 g of KTS-1 was added and adhered to the outside of the coating layer. The rice seeds taken out from the simple seed coating machine are spread so as not to overlap with the stainless steel bat, and the rice seeds are sprayed with water three times a day to promote the oxidation of iron, and then dried. As a result, coated rice seeds (I) for comparison were obtained.

Comparative manufacturing example 2
500 g of DAE1K and 50 g of KTS-1 were mixed to obtain 550 g of an iron mixture B.
About 5 L of water was put into a polyethylene bucket, 1 kg of dried rice seeds (Koshihikari) was put into the bucket, and the seeds were soaked at about 10 ° C. for 2 nights. Then, the rice seeds were taken out of the water and allowed to stand to remove excess water on the surface, and then put into a drum of a seed coating machine (KC-151, manufactured by Keibunsha Seisakusho). The tilt angle (elevation angle) of the drum was adjusted to be 45 degrees. The rice seeds are rolled by operating the seed coating machine (drum rotation speed; 21.9 rpm), and while spraying water on the rice seeds by spraying, the amount is about 1/4 of the iron mixture B 550 g (about 138 g). Was added and attached to rice seeds. When the iron mixture B adhered to the inner wall of the drum, it was scraped off using a dustpan to attach substantially the entire amount of the iron mixture B added at one time to the rice seeds. Then, by repeating the same operation three times, 550 g of the iron mixture B was adhered to the rice seeds to form a coating layer. The total amount of water used for coating was about 100 g. Next, the seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 25 g of KTS-1 was added and adhered to the outside of the coating layer. Spread the rice seeds taken out from the seed coating machine so that they do not overlap with the seedling box, spray water on the rice seeds about 3 times a day for about 1 week to promote iron oxidation, and then dry them. Obtained coated rice seeds (II) for comparison.

Next, a test example is shown.

Test Example 1
About 30 g of soil was placed in a plastic petri dish, moistened with water, and then 50 coated rice seeds were sown on the soil surface. The plastic petri dish was allowed to stand outdoors and photographed with a time-lapse camera to observe the state of the plastic petri dish, and the number of coated rice seeds remaining one day after sowing was counted, and the residual rate was calculated from the following formula.
Residual rate (%) = Number of coated rice seeds remaining 1 day after sowing / 50 × 100
The results are shown in Table 1. In Table 1, the rice seed (control) refers to an uncoated rice seed, and the seed was eaten by birds such as sparrows, so that the residual rate was 0%.

Test Example 2
A water-moistened gauze was spread on a plastic petri dish, and 20 coated rice seeds were sown on it. The plastic petri dish was covered with a lid and allowed to stand in a constant temperature machine set at 17 ° C., and after 10 days, the presence or absence of germination was investigated, and the germination rate was calculated from the following formula.
Germination rate (%) = number of germinated seeds / 50 × 100
The results are shown in Table 2.

Test Example 3
In a 12.9m x 100m paddy field, the water was drained after scratching. One plot was 0.9 m × 70 m, and coated rice seeds were sown on the soil surface of the plot. The sowing was carried out with an inter-row spacing of 30 cm, an inter-strain spacing of 18 cm, and the number of coated rice seeds per site being 5 to 7. After sowing, water was added to the paddy field. Thirteen days after sowing, it was confirmed whether seedlings were present at the sowing positions in 90 randomly selected places, and the seedling standing rate was investigated. The seedling standing rate was calculated from the following formula.
Seedling rate (%) = number of places where seedlings are present / 90 x 100
The results are shown in Table 3.

Test Example 4
Ten coated rice seeds were put into a petri dish containing 50 mL of hard water three times and allowed to stand at room temperature (about 20 ° C.). After 30 minutes, the presence or absence of peeling of the coating was visually observed.
The results are shown in Table 4.

1 Shaft 2 Polyethylene cup 3 Stirrer 4 Stand

Claims (7)

A coated rice seed having a coating layer, wherein the coating layer is a coated rice seed containing zinc oxide, a surfactant, and at least one selected from the following group (A), and is oxidized. The average particle size of zinc is in the range of 0.1 to 50 μm, the weight ratio of at least one selected from the following group (A) to zinc oxide is in the range of 1: 200 to 1:10, and coated rice seeds. The content of at least one selected from the following group (A) in the above is in the range of 0.05 to 4% by weight, coated rice seeds.
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer. A coated rice seed having a coating layer, wherein the coating layer contains zinc oxide and at least one selected from the following group (A), and a surfactant is retained on the surface at least. In rice seeds, the average particle size of zinc oxide is in the range of 0.1 to 50 μm, and the weight ratio of zinc oxide to at least one selected from the following group (A) is 1: 200 to 1:10. A coated rice seed in which the content of at least one selected from the following group (A) in the coated rice seed is in the range of 0.05 to 4% by weight.
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer. The rice seed according to claim 1 or 2, wherein the coating layer contains at least one selected from the following group (B).
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate. According to claim 3, the coating layer includes a first layer containing at least one selected from the group (B), and a second layer containing zinc oxide provided outside the first layer. The listed rice seeds. A method for producing coated rice seeds having the following steps, in which the average particle size of zinc oxide is in the range of 0.1 to 50 μm, and the weight ratio of at least one selected from the following group (A) to zinc oxide. Is in the range of 1: 200 to 1:10, and the content of at least one selected from the following group (A) in the coated rice seeds is in the range of 0.05 to 4% by weight, a method for producing coated rice seeds. ..
(1) While rolling the rice seeds, add at least one aqueous dispersion selected from the following group (A) and zinc oxide, and add at least one selected from the following group (A) and zinc oxide. A step of forming a coating layer containing and (2) a surfactant is added while rolling the seeds obtained in the step (1), and an interface is formed on the outside of the layer formed in the step (1). A step of retaining the activator and (3) a step of drying the seeds obtained in the step (2).
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer. A method for producing coated rice seeds having the following steps, in which the average particle size of zinc oxide is in the range of 0.1 to 50 μm, and the weight ratio of at least one selected from the following group (A) to zinc oxide. Is in the range of 1: 200 to 1:10, and the content of at least one selected from the following group (A) in the coated rice seeds is in the range of 0.05 to 4% by weight, a method for producing coated rice seeds. ..
(1) While rolling the rice seeds, at least one aqueous dispersion selected from the following group (A), at least one selected from the following group (B), and zinc oxide are added to the following group. A step of forming a coating layer containing at least one selected from (A), at least one selected from the following group (B), and zinc oxide, (2) seeds obtained in the above step (1). While rolling, a surfactant is added to hold the surfactant on the outside of the layer formed in the step (1), and (3) the seeds obtained in the step (2) are dried. Process.
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate. A method for producing coated rice seeds having the following steps, in which the average particle size of zinc oxide is in the range of 0.1 to 50 μm, and the weight ratio of at least one selected from the following group (A) to zinc oxide. Is in the range of 1: 200 to 1:10, and the content of at least one selected from the following group (A) in the coated rice seeds is in the range of 0.05 to 4% by weight, a method for producing coated rice seeds. ..
(1) (I) While rolling the rice seeds, add at least one aqueous dispersion selected from the following group (A) and at least one selected from the following group (B), and add the following group (I). A step of forming a coating layer containing at least one selected from the following group (B) and at least one selected from the following group (B), and (II) while rolling the seeds obtained in the above step (I). , At least one aqueous dispersion selected from the following group (A) and zinc oxide are added, and at least one selected from the following group (A) is added to the outside of the layer formed in the step (I). , (2) While rolling the seeds obtained in the above step (1), a surfactant was added to form a coating layer containing zinc oxide, and the layer formed in the above step (1) was formed. A step of retaining the surfactant on the outside, and (3) a step of drying the seeds obtained in the above step (2).
Group (A): A group consisting of an acrylic resin, a vinyl acetate resin, a urethane resin and a butadiene copolymer.
Group (B): A group consisting of titanium oxide, magnesium oxide, clay, zeolite, barium sulfate and calcium carbonate.

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