JP6682977B2 - Coated rice seed and method for producing the same - Google Patents

Description

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

Paddy rice direct-seeding cultivation is a cultivation method in which rice seeds are directly sown in the paddy field, and has the advantage that labor saving of agricultural work can be achieved because seeding and transplanting work are unnecessary, while feeding damage by birds such as ducks and sparrows. It also has the drawback that it is susceptible to (bird damage). Since the decrease in seedling establishment rate due to bird damage leads to a decrease in revenue, there has been a strong demand for measures to avoid bird damage. 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 (for example, see Non-Patent Document 1). .
In addition, iron-coated submerged direct sowing is known as a technique of coating rice seeds with iron powder to suppress seed floating in soil surface sowing and prevent feeding damage by sparrows (for example, Non-Patent Document 2). reference). However, since the technique utilizes the fact that iron powder is solidified by being oxidized, it is necessary to dissipate heat generated during oxidation, and the management of rice seeds after coating is troublesome, and the management is also difficult. However, there was a problem that the germination rate decreased when the amount was insufficient. As a method for solving such a problem, for example, there is known a technique of coating rice seeds using polyvinyl alcohol having a high degree of saponification and a coating material such as iron oxide (see Patent Document 1).

JP, 2013-146266, A

Nagao Sakai, 3 others, "Measures to prevent cultivated bird damage in paddy-rice direct sowing culture", The Hokuriku Crop Science Bulletin (The Hokuriku Crop Science), Japan Crop Science Society, March 31, 1999, Vol. 34, p. 59-61 Minoru Yamauchi, "Iron-Coated Direct Water Seeding Manual 2010", Agricultural and Food Industry Technology Research Organization Kinki Chugoku-Shikoku Agricultural Research Center, March 2010

However, the effect of preventing the damage of rice seeds coated with iron oxide on birds was not sufficient.
An object of the present invention is to provide a coated rice seed that is less susceptible to bird damage and that is prevented from floating seeds and lowering the germination rate.

The present inventor, as a result of studying to solve such a problem, when seeding rice seeds with zinc oxide, iron oxide, a specific synthetic resin, and a surfactant, and sowing the paddy field, bird damage It was found that the seedling rate was reduced and a sufficient seedling establishment rate could be secured in the direct seeding 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, iron oxide, a surfactant, and at least one selected from the following group (A): Rice seeds.
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer.
[2] A coated rice seed having a coating layer, wherein the coating layer contains zinc oxide, iron oxide, and at least one selected from the following group (A), and a surfactant is at least Coated rice seeds retained on the surface.
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer.
[3] The coating layer has a first layer containing iron oxide and a second layer containing zinc oxide provided outside the first layer, according to [1] or [2]. Rice seeds.
[4] Powder containing zinc oxide and iron oxide, the weight ratio of zinc oxide to iron oxide is in the range of 1: 1000 to 1: 1 and the average particle size is in the range of 0.01 to 150 μm. Composition.
[5] A powdery composition containing zinc oxide, iron oxide, and an acrylic resin.
[6] The composition according to [4] or [5], which has an apparent specific gravity of 0.30 to 2.50 g / mL.
[7] The composition according to any one of [4] to [6], wherein the zinc oxide has an average particle size in the range of 0.01 to 100 μm.
[8] A kit for producing coated rice seeds, which contains zinc oxide, iron oxide, a surfactant, and at least one selected from the following group (A).
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer.
[9] A method for producing coated rice seeds, which comprises the following steps.
(1) At least one kind selected from the following group (A) by adding at least one kind of aqueous dispersion selected from the following group (A), zinc oxide, and iron oxide while rolling the rice seeds: And a step of forming a coating layer containing zinc oxide and iron oxide, (2) a surfactant is added while rolling the seed obtained in the step (1), and in the step (1), A step of holding a surfactant on the outside of the formed layer, and (3) a step of drying the seed obtained in the step (2).
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer.
[10] A method for producing coated rice seeds, which comprises the following steps.
(1) (I) At least one kind of water dispersion selected from the following group (A) and iron oxide are added while rolling the rice seeds, and at least one kind selected from the following group (A): A step of forming a coating layer containing iron oxide, and (II) at least one aqueous dispersion selected from the following group (A) while rolling the seed obtained in the step (I): A step of adding zinc oxide to form a coating layer containing zinc oxide and at least one selected from the following group (A) on the outside of the layer formed in the step (I), (2) the step While rolling the seed obtained in (1), a step of adding a surfactant to hold the surfactant outside the layer formed in the step (1), and (3) the step (2) ) A step of drying the seed obtained in (1).
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer.
[11] A coated rice seed produced by the production method according to [9] or [10].

  The coated rice seed of the present invention is less susceptible to bird damage, and the floating of the seed and the lowering of the germination rate are suppressed, and a sufficient seedling establishment rate can be secured in direct rice seeding cultivation.

It is explanatory drawing for demonstrating the simple seed coating machine used for coating 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 at least zinc oxide, iron oxide, a surfactant, and at least one selected from the group (A). One type (hereinafter referred to as the present synthetic resin), or the coating layer contains zinc oxide, iron oxide, and the present synthetic resin, and a surfactant is retained on at least the surface. And

  In the present invention, the rice seed refers to a seed of a variety generally cultivated as rice. Examples of the variety include Japonica variety and Indica variety, and a variety having high lodging resistance and high germination resistance is 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 two kinds of zinc oxide (manufactured by Nippon Chemical Industry Co., Ltd.). In the present invention, it is preferable to use zinc oxide having a purity of 99% or more (weight% based on the zinc oxide). The purity of zinc oxide is determined by the test method specified in Japanese Industrial Standard (JIS) K1410. Moreover, 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 particle size distribution measuring device, and refers to a particle size at which the cumulative frequency is 50% in the volume standard frequency distribution. The average particle size of zinc oxide can be obtained by so-called wet measurement, which is a method of dispersing particles of zinc oxide in water using Mastersizer 2000 (manufactured by Malvern) as a laser diffraction / scattering particle size distribution measuring device. it can.

  The content of zinc oxide in the present rice seed 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.

In the present invention, iron oxide means one containing an oxide of iron represented by Fe ₂ O ₃ as a main component, and the content of α-Fe ₂ O ₃ called hematite is 70% or more (based on the iron oxide. Preference is given to using iron oxide, which is in% by weight. In the present invention, the content of α-Fe ₂ O ₃ is determined by XRD (X-ray diffraction method). In addition, powdered iron oxide is usually used, and the average particle size of the iron oxide is in the range of 0.1 to 150 μm, preferably 0.1 to 100 μm, and more preferably 1 to 80 μm. In the present invention, the average particle size of iron oxide is a particle size measured by a laser diffraction / scattering particle size distribution measuring device, and refers to a particle size at which the cumulative frequency is 50% in the volume-based frequency distribution. The average particle size of iron oxide can be obtained by so-called wet measurement, which is a method of dispersing iron oxide particles in water using Mastersizer 2000 (manufactured by Malvern) as a laser diffraction / scattering particle size distribution measuring device. it can.

  The content of iron oxide in the present rice seeds is usually 0.5 to 80% by weight, preferably 1 to 70% by weight, more preferably 1 to 50% by weight.

The surfactant in the present invention is preferably at least one selected from the group consisting of nonionic surfactants and anionic surfactants, and comprises polyoxyethylene alkyl ether, polyoxyethylene arylphenyl ether and sulfonate. At least one selected from the group is more preferable. The polyoxyethylene aryl phenyl ether is preferably polyoxyethylene polystyryl phenyl 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 polystyryl phenyl ether include polyoxyethylene tristyryl phenyl ether. Examples of the naphthalene sulfonate and its formaldehyde condensate include formaldehyde condensate of sodium naphthalene sulfonate, and examples of the phenol sulfonate and formaldehyde condensate thereof include formaldehyde condensate of sodium phenol sulfonate, Examples of the lignin sulfonate include sodium lignin sulfonate. These surfactants are commercially available, for example, as commercially available polyoxyethylene tristyryl phenyl ether, Solpol 5080 (manufactured by Toho Chemical Industry Co., Ltd.) can be mentioned, and commercially available sodium naphthalene sulfonate formaldehyde. Examples of the condensate include Newcalgen PS-P (manufactured by Takemoto Yushi Co., Ltd.).
In the present invention, it is preferable to use a powdery surfactant, and it is preferable to use a surfactant in which particles having a size of 100 μm or more have a particle size distribution of 2% or less. In the present invention, the particle size distribution of the surfactant means a particle size distribution measured by a sieving method, and that particles having a size of 100 μm or more has a particle size distribution of 2% or less means that the residue on the sieve having an opening of 100 μm remains. It shows that the weight ratio of the amount to the total amount is 2% or less. As for the particle size distribution of the surfactant, 10 g of the surfactant is placed on a sieve having a mesh of 100 μm (a test sieve having a frame diameter of 200 mm and a depth of 45 mm defined in Japanese Industrial Standard (JIS) Z8801-1), and a low tap is applied. After sieving for 10 minutes with a sieving device such as a type shaker, the weight of the surfactant remaining on the sieve is weighed and calculated by the following formula.
Remaining amount on sieve (%) = weight of surfactant remaining on sieve (g) / weight of surfactant initially placed on sieve (g) × 100
The content of the surfactant in the present rice seed is usually 0.002 to 6% by weight, preferably 0.01 to 5% by weight, more preferably 0.1 to 1% 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 alkyl acrylate or an alkyl methacrylate as one of the monomers. Examples of the alkyl acrylate 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 and a polyol, and examples of the polyisocyanate include aliphatic isocyanates such as hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI). Examples 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.
The acrylic resin is preferably a copolymer of an alkyl acrylate or an alkyl methacrylate and at least one selected from the group consisting of aromatic vinyl monomers, olefin monomers and silicone macromers. Aromatic vinyl monomers include styrene and olefin monomers include ethylene. As the acrylic resin, specifically, a copolymer of an alkyl acrylate and an alkyl methacrylate (Mowinyl-Powder LDM7000P manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), a copolymer of an alkyl acrylate and styrene (Nippon Synthetic Chemical Industry Co., Ltd. Movinyl 6485, etc.), copolymers of acrylic acid alkyl ester and silicone macromer (Nippon Synthetic Chemical Industry Co., Ltd., Movinyl 7110 etc.) and ethylene and methacrylic acid alkyl ester copolymer ( Mitsui DuPont Polychemical Co., Ltd. Nucrel N1108C, etc.).
The vinyl acetate resin is a copolymer of vinyl acetate and at least one selected from the group consisting of alkyl acrylate, alkyl methacrylate, vinyl versatate, olefin monomer, halogenated olefin monomer and unsaturated dicarboxylic acid. Coalescence is preferred. Examples of the alkyl acrylate 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. As the vinyl acetate resin, specifically, a copolymer of vinyl acetate, vinyl versatate and alkyl acrylate (Mowinyl-Powder LDM2072P manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), a copolymer of vinyl acetate and ethylene Examples include a combination (Mobinyl 180E manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) and a copolymer of ethylene, vinyl acetate, and vinyl chloride (Sumika Flex 808HQ manufactured by Sumika Chemtex Co., Ltd.).
The urethane resin is preferably a urethane resin obtained by polymerizing an aliphatic isocyanate and at least one selected from the group consisting of polyester polyols and polycarbonate polyols. As the urethane resin, specifically, a urethane resin obtained by polymerizing an aliphatic isocyanate and a polyester polyol (Superflex 500M manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) and an aliphatic isocyanate and a polycarbonate polyol are polymerized. Urethane resin (Daiichi Kogyo Seiyaku Co., Ltd. Superflex 460 etc.) is mentioned.
The butadiene copolymer is preferably a copolymer of butadiene and at least one selected from the group consisting of methacrylic acid alkyl esters and aromatic vinyl monomers. Methyl methacrylate is mentioned as the methacrylic acid alkyl ester, and styrene is mentioned as the aromatic vinyl monomer. As the butadiene copolymer, specifically, a copolymer of butadiene and styrene (hereinafter, referred to as a butadiene-styrene copolymer), a copolymer of butadiene, styrene, and methyl methacrylate (hereinafter, butadiene- Styrene-methyl methacrylate copolymer), carboxylated butadiene-styrene copolymer (NALSTAR 103, etc. manufactured by A & L Japan) and carboxylated butadiene-styrene-methyl methacrylate copolymer (Japan A & L). Nalster SR140 etc. manufactured by Co., Ltd.) can be mentioned.
The glass transition point (Tg) of the present synthetic resin is usually 50 ° C or lower, preferably in the range of -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 present 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 diameter 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 a particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and a particle size at a cumulative frequency of 50% in a volume-based frequency distribution. Refers to. The average particle size of the fine particles of the synthetic resin is obtained by so-called wet measurement, which is a method of dispersing the fine particles of the synthetic resin in water using Mastersizer 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% (% by weight based on the latex). Further, the form thereof is latex, and commercially available synthetic resins include Movinyl 6485 (copolymer of alkyl acrylate and styrene) manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Nalster SR140 (manufactured by Japan A & L Co., Ltd.). Carboxylated butadiene-styrene-methyl methacrylate copolymer) and Daiichi Kogyo Seiyaku Co., Ltd. Superflex 500M (urethane resin obtained by polymerizing aliphatic isocyanate and polyester polyol).
The powdery synthetic resin is generally obtained by spray-drying a 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 a sieve through which the whole amount of the powdery synthetic resin can pass (a diameter of a frame of 200 mm, a depth of 45 mm of Japan Industrial Co., Ltd. It is represented by the minimum value of the opening of the test sieve specified in the standard (JIS) Z8801-1. In addition, examples of the present synthetic resin which is in the form of powder and which is commercially available include Mowinyl-Powder LDM7000P (copolymer of alkyl acrylate and methacrylic acid alkyl ester) manufactured by Nippon Synthetic Chemical Industry Co., Ltd. .

  The content of the present synthetic resin in the present rice seeds is usually 0.01 to 5% by weight, preferably 0.05 to 4% by weight, more preferably 0.1 to 3% by weight.

The coating layer may include an agrochemical active ingredient. Examples of such agrochemical active ingredients include insecticidal active ingredients, bactericidal active ingredients, herbicidal active ingredients and plant growth regulating active ingredients.
Such insecticidal active ingredients include, for example, clothianidin, imidacloprid and thiamethoxam.
Such fungicidal active ingredients include, for example, isotianil and flametopyr.
Examples of such herbicidal active ingredients include imazosulfuron 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 agricultural chemical active ingredient, and if necessary, it can be mixed with a solid carrier such as clay and pulverized with a pulverizer such as a dry pulverizer to obtain a powdery agricultural chemical. 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 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 powdered pesticide when the powdered pesticide is a mixture with a solid carrier means the average particle size of the mixture. The average particle size of powdered pesticides is obtained by so-called wet measurement, which is a method of dispersing particles of powdered pesticides in water using Mastersizer 2000 (manufactured by Malvern) as a laser diffraction / scattering particle size distribution measurement device. be able to.
When the coating layer contains a pesticidal active ingredient, its content in the rice seed is usually 0.001 to 3% by weight, preferably 0.005 to 2% by weight, more preferably 0.01 to 2% by weight. It is a range.

  The coating layer may include a coloring agent. Examples of such colorants include pigments, dyes and dyes, and of these, use of pigments is preferable. As such a pigment, use of a red or blue pigment is preferable, and examples thereof include Ultramarine Blue Nubix 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 seed can be used separately, or all or at least two components can be mixed and used. The kit of the present invention (hereinafter referred to as the present kit) contains zinc oxide, iron oxide, a surfactant and the present synthetic resin, which may be contained in one container or in two or more containers. It may be included. That is, the kit may include one or more containers. When the kit comprises more than one container, each container may contain different components. In addition, the present kit may contain other components such as an agrochemical active ingredient (hereinafter referred to as component α).

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

When the present synthetic resin is in the form of latex, a powdery composition containing zinc oxide and iron oxide, a surfactant, and the present synthetic resin are used to form the present coating layer 2, and then the surfactant is added. The method for holding the surface on the surface will be described below.
While rolling the rice seed, the powdery composition containing zinc oxide and iron oxide and the present synthetic resin are added separately to form the present coating layer 2 on the rice seed. This synthetic resin acts as a binder (binder) and can adhere zinc oxide and iron oxide to rice seeds. As the present rice seed, an embodiment in which a surfactant is retained on at least the surface thereof is preferable. After forming the present coating layer 2 on the rice seed, the surfactant is added while maintaining the rolling state of the rice seed. Then, by putting it in a rolling state, the surfactant is attached to the outside of the main coating layer 2, and the surfactant can be held on the surface.

  When the present coating layer is formed by separately using iron oxide and zinc oxide, the first layer containing iron oxide and the first layer containing iron oxide are added by first adding iron oxide and then adding zinc oxide. It is possible to obtain the present rice seed having a second layer containing zinc oxide provided on the outer side of one layer. Specifically, while rolling the rice seeds, iron oxide and the synthetic resin are added separately to form a first layer containing the iron oxide and the synthetic resin, and then the rolling state of the rice seeds. While maintaining the above condition, zinc oxide and the present synthetic resin are separately added 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 iron oxide (hereinafter sometimes referred to as the present composition) is suitable as a powdery composition for rice seed coating. The weight ratio of zinc oxide to iron oxide in the present composition is in the range of 1: 1000 to 1: 1, preferably 1: 200 to 1: 1, and more preferably 1: 200 to 1: 2. . The range of 1: 200 to 1: 3 is preferable in consideration of the growth of plants and the influence on the environment. The average particle size of the composition is in the range of 0.01 to 150 μm, preferably 1 to 100 μm, more preferably 1 to 50 μm. In the present invention, the average particle size of the 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 composition is obtained by so-called wet measurement, which is a method of dispersing particles of the composition in water using Mastersizer 2000 (manufactured by Malvern) as a laser diffraction / scattering particle size distribution measuring device. be able to.
The apparent specific gravity of the composition is in the range of 0.30 to 2.50 g / mL, preferably 0.50 to 2.20 g / mL, more preferably 1.00 to 2.20 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 specific gravity of the present composition is determined by a method according to the test method stipulated in the official pesticide test method (physical test method, Ministry of Agriculture, Forestry and Forestry Notification No. 71 of February 3, 1960). The method is an 8 mesh standard sieve (test sieve defined by Japanese Industrial Standard (JIS) Z8801-1 with a frame diameter of 200 mm and a depth of 45 mm) on a 100 mL cylindrical metal container having an inner diameter of 50 mm. Place the sample in it and gently scrape it off with a brush to fill the container. Immediately, scrape the excess using a slide glass and weigh it to obtain the weight of the content, and calculate the apparent specific gravity 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 content / 100

Some examples of the composition are given below. In the following examples,% represents% by weight of the composition.
-Containing zinc oxide and iron oxide, having an average particle diameter of 0.01 to 150 m, an apparent specific gravity of 0.30 to 2.50 g / mL, and a weight ratio of zinc oxide to iron oxide of 1: 1000 to 1: 1. Is a powdery composition.
-Containing zinc oxide and iron oxide, having an average particle size of 1 to 100 m, an apparent specific gravity of 0.50 to 2.20 g / mL, and a weight ratio of zinc oxide to iron oxide of 1: 200 to 1: 1. Powdery composition.
-Containing zinc oxide and iron oxide, having an average particle size of 1 to 50 m, an apparent specific gravity of 1.00 to 2.20 g / mL, and a weight ratio of zinc oxide to iron oxide of 1: 200 to 1: 1. Powdery composition.
-Containing 1 to 50% zinc oxide and 50 to 99% iron oxide, having an average particle size of 1 to 30 m, an apparent specific gravity of 1.20 to 2.20 g / mL, and a weight ratio of zinc oxide to iron oxide of 1 : 100-1: 1 powdery composition.
-Containing 1 to 30% zinc oxide and 70 to 99% iron oxide, having an average particle size of 1 to 30 m, an apparent specific gravity of 1.20 to 2.20 g / mL, and a weight ratio of zinc oxide to iron oxide of 1 : 100 to 1: 2 powdery composition.
A powdery composition composed of 25% zinc oxide and 75% iron oxide, having an average particle size of 2.7 μm, an apparent specific gravity of 1.38 g / mL, and a weight ratio of zinc oxide to iron oxide of 1: 3. .
A powdery composition composed of 5% zinc oxide and 95% iron oxide, having an average particle size of 28.6 μm, an apparent specific gravity of 2.07 g / L, and a weight ratio of zinc oxide to iron oxide of 1:19. .

Moreover, when the form of the present synthetic resin is powdery, the present composition may include the present synthetic resin. Some examples of the present composition containing the present synthetic resin are shown below. In the following examples,% represents% by weight of the composition.
-A powdery composition containing zinc oxide, iron oxide, and an acrylic resin.
-Containing zinc oxide, iron oxide and acrylic resin, having an average particle size of 1 to 50 μm, an apparent specific gravity of 1.0 to 2.20 g / mL, and a weight ratio of zinc oxide to iron oxide of 1: 200 to 1: The powdery composition which is 1.
-Zinc oxide containing 4 to 30%, iron oxide 65 to 94% and acrylic resin 2 to 5%, average particle diameter of 1 to 30 m, apparent specific gravity of 1.20 to 2.20 g / mL, zinc oxide and oxidation A powdery composition having a weight ratio with iron of 1: 100 to 1: 2.
・ Made of 24% zinc oxide, 72.1% iron oxide and 3.9% acrylic resin, having an average particle diameter of 2.6 μm, an apparent specific gravity of 1.33 g / mL, and a weight ratio of zinc oxide to iron oxide. A powdery composition which is 1: 3.
・ Zinc oxide consisting of 4.8%, iron oxide 91.4% and acrylic resin 3.8%, having an average particle diameter of 21.3 μm, an apparent specific gravity of 1.93 g / mL, and a weight ratio of zinc oxide and iron oxide. A powdery composition which is 1:19.
In the above example, the acrylic resin is preferably a copolymer of an acrylic acid alkyl ester and a methacrylic acid alkyl ester.

  The method for producing the present rice seed (hereinafter referred to as the present production method) will be described. In this production method, rice seeds are usually soaked before use. Immersion can be carried out as follows. First, dry rice seeds are put in a bag such as a seed pad and soaked in water. In order to obtain coated rice seeds with a high germination rate, it is desirable to soak the seeds for 3 to 4 days at a water temperature of 15 to 20 ° C. After removing rice seeds from water, excess water on the surface of the seeds is usually removed by allowing the seeds to stand still or by applying a dehydrator.

First, a method for producing a coated rice seed having the main coating layer 2 and having a surface active agent 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 an aqueous dispersion of the present synthetic resin, zinc oxide, and iron oxide to form the present coating layer 2 while rolling the rice seeds, (2) obtained in the step (1) A step of adding a surfactant while rolling the obtained seeds, and holding the surfactant on the outside of the main coating layer 2 formed in the step (1), and (3) in the step (2) A step of drying the obtained seed.
In the present production method 1, first, a powdery composition containing an aqueous dispersion of the present synthetic resin and zinc oxide and iron oxide (hereinafter referred to as powdery composition Z) while rolling the soaked rice seeds. ) And are added to carry out the step of forming the coating layer 2 (hereinafter referred to as step 1). As the aqueous dispersion of the present synthetic resin, the present synthetic resin that is commercially available in the form of latex can be used after diluting it with water as needed. In step 1, an aqueous dispersion of the present synthetic resin (hereinafter referred to as the present latex) may be added, and then the powdery composition Z may be added, or the order may be reversed without any problem. The latex and the powdery composition Z may be added at the same time. Both the powdery composition Z and the present latex are added so as to cover rice seeds in a rolling state. The present latex is used in the range of the present synthetic resin content of usually 20 to 65%, preferably 30 to 60%, and more preferably 30 to 40% (all are% by weight based on the latex). The present latex may be added by either dropping or spraying. After adding the latex and the powdered composition Z, the rolling state of the rice seed is maintained, and the powdered composition Z is attached to the rice seed using the latex as a binder.
The total amount of zinc oxide added in the present production method 1 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 dry rice seeds. The range is 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 iron oxide added is usually 1 to 399.9 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 dry rice seeds. is there. The total addition amount of the powdery composition Z is usually 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 dry rice seeds. The total addition amount of the present synthetic resin is usually 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 dry rice seeds. Is. The weight ratio of the synthetic resin to the powder composition Z is usually 1: 200 to 1:10, preferably 1: 100 to 1:25.

In Step 1, the powdery composition Z and the synthetic resin are separately added, and Step 1 is repeated to form a uniform coating layer. In that case, the addition amount of the powdery composition Z once is usually 1 to 1/10, preferably about 1/2 to 1/5 of the total addition amount of the powdery composition Z. The addition amount of the present synthetic resin at one time may be changed according to the state of the coating, but is usually 1 to 1/10, preferably about 1/2 to 1/5 of the total addition amount of the present synthetic resin. is there. In the present invention, the one-time addition amount of the present synthetic resin means the amount of the present synthetic resin required until the entire one-time addition amount of the powdery composition Z adheres to rice seeds. The powdery composition Z and the synthetic resin do not have to be added alternately, and either may be added depending on the state of the coating. Also, only water can be added if necessary. The total amount of water added is usually 1/2 to 1/100, preferably 1/3 to 1/10 of the total amount of the powdery composition Z. However, the total amount of water added includes water used for diluting the latex.
In Step 1, when the powdery composition Z adheres to the inner wall of the apparatus or the like, by scraping off with a scraper or the like, substantially the entire amount of the powdery composition Z added can be adhered 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 main coating layer 2 formed in step 1 (hereinafter, Step 2) will be performed. In step 2, after the step 1 is carried out, a surfactant is added to the rice seed while keeping the rolling state of the rice seed, and the rice seed is brought into a rolling state to retain the surfactant outside the coating layer 2. Can be made.

  After carrying out step 2, a step of drying the seed obtained in step 2 is carried out to obtain the present rice seed. Specifically, after carrying out the step 2, the rice seeds are taken out of the apparatus, put in a seedling box, spread thinly, and allowed to stand to dry. Usually, it is dried until the water content is 20% (% by weight based on the weight of coated rice seeds) or less. 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 Laboratories can be used. In addition, instead of the seedling box, a vine or a vinyl sheet may be used, and a thin sheet may be spread on it and dried.

Next, the main coating layer 2 is provided, and the main coating layer 2 includes a first layer containing iron oxide and the present synthetic resin, and a zinc oxide and the present synthetic resin provided outside the first layer. A method for producing a coated rice seed having a second layer and having a surfactant retained on its surface (hereinafter referred to as the present production method 2) will be described. The present manufacturing method 2 has the following steps.
(1) (I) a step of adding the latex and iron oxide while rolling the rice seeds to form a coating layer containing the synthetic resin and iron oxide; and (II) the step (I) ) While rolling the seeds obtained in), the latex and zinc oxide are added to form a coating layer containing the synthetic resin and zinc oxide on the outside of the layer formed in the step (I). And (2) a step of adding a surfactant while rolling the seed obtained in the step (1) so that the surfactant is retained outside the layer formed in the step (1), And (3) a step of drying the seed obtained in the step (2).
In the present manufacturing method 2, first, a step of adding the latex and iron oxide while rolling the soaked rice seeds to form a coating layer containing the synthetic resin and iron oxide (hereinafter, referred to as step (Marked as I). Step I can be performed in the same manner as step 1 of the present production method 1, except that iron oxide is used instead of the powdery composition Z. After carrying out step I, while rolling the seed obtained in step I, the present latex and zinc oxide are added, and the present synthetic resin and zinc oxide are added to the outside of the layer formed in step I. The step of forming a coating layer containing (hereinafter referred to as step II) is performed. Step II can be performed in the same manner as step I, except that zinc oxide is used instead of iron oxide.
The total addition amount of iron oxide in the present production method 2 is usually 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 dry rice seeds. . The total amount of zinc oxide added 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 dry rice seeds. is there. 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 addition amount of the present synthetic resin is usually 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 dry rice seeds. Is. The weight ratio of the total amount of the synthetic resin to the total amount of zinc oxide and the total amount of iron oxide is usually 1: 200 to 1:10, preferably 1: 100 to 1:25. Is the range.
After performing step II, step 2 and subsequent steps of the present manufacturing method 1 may be performed in the same manner.

The present rice seed can be used in direct seeding cultivation of paddy rice, and the method is carried out by sowing the rice seed directly in the paddy field. In the present invention, a paddy refers to either a flooded paddy or a dropped paddy. Specifically, the method described in "Iron-Coated Direct Water Seeding Manual 2010" (Minori Yamauchi, National Agriculture and Food Research Organization, Kinki Chugoku-Shikoku Agricultural Research Center, March 2010, Non-Patent Document 1) Seeding is done according to. At that time, a direct seeding machine for iron coating such as Tetsu Maki-chan (manufactured by Kubota Corporation) may be used. Thus, good seedling can be achieved by sowing by the usual method. After that, the rice can be grown by maintaining the usual cultivation 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 and herbicides.

  The present invention will be described in more detail with reference to examples.

  First, a production example and a comparative production example will be shown.

In the following Production Examples and Comparative Production Examples, unless otherwise specified, Hinohikari seeds were used as rice seeds, and α-Fe ₂ O ₃ content of 78% and iron oxide having an average particle diameter of 42.7 μm were used. Using. The production was carried out at room temperature (about 20 ° C.). Moreover,% represents weight%.
Further, the trade names described in Production Examples and Comparative Production Examples are as follows.
Zinc oxide 3N5: Zinc oxide, manufactured by Kanto Chemical Co., Inc., average particle size; 7.7 μm
Two kinds of zinc oxide: zinc oxide, manufactured by Nippon Kagaku Kogyo Co., Ltd., average particle size; 0.24 μm
Shokoyama Clay S: Wax stone, manufactured by Shokoyama Mining Co., Ltd., average particle size: 6.7 μm
DAE1K: Iron powder, DOWA IP Creation KTS-1: Calcined gypsum, Yoshino Gypsum Sales Co., Ltd. Nalster SR140: Carboxylated butadiene-styrene-methyl methacrylate copolymer, Tg; -12 ° C, synthetic resin content; 48.5%, Japan A & L Co., Ltd. Movinyl 180E: Copolymer of vinyl acetate and ethylene, Tg; -15 ° C, synthetic resin content; 55%, Superflex 500M manufactured by Nippon Synthetic Chemical Industry Co., Ltd .: with aliphatic isocyanate Urethane resin obtained by polymerizing polyester polyol, Tg; -39 ° C, synthetic resin content; 45%, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., Mowinyl-Powder LDM7000P: copolymer of alkyl acrylate and alkyl methacrylate, Tg; 8 ° C, synthetic resin Amount: 85%, Nippon Synthetic Chemical Industry Co., Ltd. Movinyl 6485: Copolymer of alkyl acrylate and styrene, Tg; -22 ° C., synthetic resin content: 55%, Nippon Synthetic Chemical Industry Co., Ltd. Solpol 5080: Polyoxyethylene tristyryl phenyl ether, manufactured by Toho Chemical Industry Co., Ltd.

Production example 1
First, a simple seed coating machine that can coat small amounts of rice seeds was prepared. As shown in FIG. 1, a polyethylene cup 2 with a capacity of 500 mL is attached to the tip of the shaft 1, and it is inserted into the drive shaft of an agitator 3 (Three One Motor, manufactured by Shinto Kagaku) so that the elevation angle becomes 45 degrees. A simple seed coating machine was produced by mounting the stirrer 3 at an angle on the stand 4.
Next, 5.0 g of zinc oxide 3N5 and 5.0 g of iron oxide were mixed to obtain a powdery composition (1). The average particle size of the powder composition (1) was 11.9 μm.
Further, 0.41 g of Nalster SR140 and 0.14 g of water were mixed to obtain 0.55 g of Nalster SR140 water dilution liquid.
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 therein, and soaked for 10 minutes. After that, the rice seeds were taken out from the water, excess water on the surface was removed, and then the rice seeds were put into the polyethylene cup 2 attached to the prepared simple seed coating machine. Rice seeds are tumbled by operating the simple seed coating machine in the range of 130 to 140 rpm of the stirrer 3, and an amount of about 1/4 (about 0.14 g) of 0.55 g of Nalster SR140 water dilution liquid is added. While dropping the rice seeds with a dropper, an amount of about ¼ of 10 g of the powdery composition (1) (about 2.5 g) was added and attached to the rice seeds. When the powdery composition (1) adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula so that almost all the powdery composition (1) added at one time was adhered to the rice seeds. . Then, the same operation was repeated 3 times to adhere 10 g of the powdery composition (1) to rice seeds to form a coating layer. The total amount of water used for coating was 2.2 g. Next, the rolling condition of rice seeds was maintained while the simple seed coating machine was kept operating, and 0.1 g of Solpol 5080 was added thereto to be attached to the outside of the coating layer. The rice seed taken out from the simple seed coating machine was spread so as not to overlap the stainless steel vat and dried overnight to obtain the coated rice seed (1) of the present invention.

Production example 2
A powdery composition (2) was obtained by mixing 9.0 g of zinc oxide 3N5 and 1.0 g of iron oxide. The powder composition (2) had an average particle diameter of 8.6 μm.
Further, 0.36 g of Movinyl 180E and 0.34 g of water were mixed to obtain 0.7 g of a water diluted solution of Movinyl 180E.
The following operations were performed according to the method described in Production Example 1. 10 g of the above powdery composition (2) was used instead of 10 g of the powdery composition (1), and 0.7 g of the above-mentioned Movinyl 180E water diluted solution was used instead of 0.55 g of Nalster SR140 water diluted solution. The coating layer was formed by adding each in four portions, and 0.1 g of Solpol 5080 was adhered to the outside of the coating layer to obtain a coated rice seed (2) of the present invention. The total amount of water used for coating was 2.3 g.

Production Example 3
2.0 g of two kinds of zinc oxide and 18.0 g of iron oxide were mixed to obtain a powdery composition (3). The powdery composition (3) had an average particle size of 10.6 μm and an apparent specific gravity of 1.89 g / mL.
Further, 0.41 g of Nalster SR140 and 0.40 g of water were mixed to obtain 0.81 g of Nalster SR140 water dilution liquid.
The following operations were performed according to the method described in Production Example 1. 20 g of the above powdery composition (3) was used instead of 10 g of the powdery composition (1), and 0.81 g of the above Nalster SR140 water dilution was used instead of 0.55 g of the Nalster SR140 water dilution, and they were used. The coating layer was formed by adding each in four portions, and 0.1 g of Solpol 5080 was attached to the outside of the coating layer to obtain a coated rice seed (3) of the present invention. The total amount of water used for coating was 2.0 g.

Production Example 4
2.5 g of two kinds of zinc oxide and 7.5 g of iron oxide were mixed to obtain a powdery composition (4). The powdery composition (4) had an average particle diameter of 2.7 μm and an apparent specific gravity of 1.38 g / mL.
Further, 1.24 g of Nalster SR140 and 1.04 g of water were mixed to obtain 2.28 g of Nalster SR140 water dilution liquid.
The following operations were performed according to the method described in Production Example 1. 10 g of the above powdery composition (4) was used instead of 10 g of the powdery composition (1), and 2.28 g of the above Nalster SR140 water diluted solution was used instead of 0.55 g of the Nalster SR140 water diluted solution. The coating layer was formed by adding each in four portions, and 0.1 g of Solpol 5080 was attached to the outside of the coating layer to obtain a coated rice seed (4) of the present invention. The total amount of water used for coating was 1.1 g.

Production Example 5
0.36 g of Movinyl 180E and 0.19 g of water were mixed to obtain 0.55 g of a water diluted solution of Movinyl 180E.
The following operations were performed according to the method described in Production Example 1. A coating layer was formed by using 0.55 g of the Mowinyl 180E water diluting liquid described above in place of 0.55 g of the Nalster SR140 water diluting liquid, and adding 10 g of the powdered composition (1) in four portions. After that, 0.1 g of Solpol 5080 was attached to the outside thereof to obtain a coated rice seed (5) of the present invention. The total amount of water used for coating was 1.4 g.

Production Example 6
0.44 g of Superflex 500M and 0.17 g of water were mixed to obtain 0.61 g of a diluted solution of Superflex 500M in water.
The following operations were performed according to the method described in Production Example 1. Nalster SR140 water diluted solution 0.55 g was used in place of the above Superflex 500M water diluted solution 0.61 g, and 10 g of powdery composition (1) was added to each in four portions to form a coating layer. After that, 0.1 g of Solpol 5080 was attached to the outside thereof to obtain a coated rice seed (6) of the present invention. The total amount of water used for coating was 1.8 g.

Production Example 7
2.5 g of two kinds of zinc oxide, 7.5 g of iron oxide, and 0.4 g of Mowinyl-Powder LDM7000P were mixed to obtain a powdery composition (5). The powdery composition (5) had an average particle diameter of 2.6 μm and an apparent specific gravity of 1.33 g / mL.
The following operations were performed according to the method described in Production Example 1. After soaking 20 g of dry rice seeds, the seeds are tumbled using a simple seed coating machine, and while spraying water onto the rice seeds by spraying, about 1/4 of powdery composition (5) 10.4 g (about 2 0.5 g) was added and attached to rice seeds. When the powdery composition (5) adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula so that almost all the powdery composition (5) added at one time was adhered to the rice seeds. . Then, the same operation was repeated 3 times to adhere 10.4 g of the powdery composition (5) to rice seeds to form a coating layer. The total amount of water used for coating was 1.5 g. Next, the rolling condition of rice seeds was maintained while the simple seed coating machine was kept operating, and 0.1 g of Solpol 5080 was added thereto to be attached to the outside of the coating layer. The rice seed taken out from the simple seed coating machine was spread so as not to overlap the stainless steel vat and dried overnight to obtain the coated rice seed (7) of the present invention.

Production Example 8
0.36 g of Movinyl 6485 and 0.37 g of water were mixed to obtain 0.73 g of a water diluted solution of Movinyl 6485.
The following operations were performed according to the method described in Production Example 1. A coating layer was formed by using 0.73 g of the Mowinyl 6485 water diluting liquid described above in place of 0.55 g of the Nalster SR140 water diluting liquid and adding 10 g of each of the powdery composition (4) in four portions. Then, 0.1 g of Solpol 5080 was attached to the outside thereof to obtain the coated rice seed (8) of the present invention. The total amount of water used for coating was 1.7 g.

Production Example 9
70.0 parts by weight of clothianidin and 30.0 parts by weight of Shokoyama Clay S were mixed and then pulverized by a centrifugal pulverizer to obtain a powdery pesticide A. The average particle size of the powdered pesticide A was 13.0 μm. 2.5 g of two kinds of zinc oxide, 7.5 g of iron oxide and 0.086 g of powdered pesticide A were mixed to obtain a powdery composition (6).
Further, 0.41 g of Nalster SR140 and 0.50 g of water were mixed to obtain 0.91 g of Nalster SR140 water dilution liquid.
The following operations were performed according to the method described in Production Example 1. In place of 10 g of the powder composition (1), 10.086 g of the above powder composition (6) was used, and in place of 0.55 g of the Nalster SR140 water dilution liquid, the above Nalster SR140 water dilution liquid 0.91 g was used, The coating layer was formed by adding each of them in four portions, and 0.1 g of Solpol 5080 was attached to the outside of the coating layer to obtain a coated rice seed (9) of the present invention. The total amount of water used for coating was 1.3 g.

Production Example 10
Superflex 500M 0.40g and water 0.76g are mixed to mix Superflex 500M water dilution liquid 1.2g (hereinafter referred to as dilution liquid A), Superflex 500M 0.04g and water 1.13g. 1.17 g of a Superflex 500M water dilution (hereinafter, referred to as a dilution B) was obtained.
The following operations were performed according to the method described in Production Example 1. After soaking 20 g of dry rice seeds, roll them using a simple seed coating machine, and oxidize while dripping about 1/4 of the diluted solution A (about 0.3 g) onto rice seeds with a dropper. An amount of about 1/4 of 9 g of iron (about 2.3 g) was added and attached to rice seeds. When iron oxide adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula to adhere substantially all the amount of iron oxide added at one time to rice seeds. Then, the same operation was repeated 3 times to attach 9 g of iron oxide to rice seeds to form a first coating layer containing iron oxide (hereinafter referred to as the first layer). The total amount of water used for coating was 0.8 g.
Then, while keeping the simple seed coating machine operating, the rolling state of the rice seeds is maintained, and about 1/4 of the diluted solution B (about 0.3 g) is dropped on the rice seeds using a dropper. Meanwhile, an amount of about ¼ of 1 g of zinc oxide 3N5 (about 0.25 g) was added and attached 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 adhere substantially all the amount of zinc oxide 3N5 added to the rice seeds at one time. Thereafter, by repeating the same operation 3 times, 1 g of zinc oxide 3N5 is attached to the outer side of the first layer, and the second coating layer containing zinc oxide (hereinafter referred to as the second layer and the second layer) is attached to the outer side of the first layer. Note) was formed. The total amount of water used for coating was 1.9 g.
Next, while keeping the simple seed coating machine operating, the rolling state of rice seeds was maintained, and 0.1 g of SOLPOL 5080 was added and allowed to adhere to the outside of the second layer. The coated rice seeds (10) of the present invention were obtained by spreading the rice seeds taken out from the simple seed coating machine so as not to overlap the stainless steel vat and drying overnight.

Comparative Production Example 1
10 g of DAE1K and 1 g of KTS-1 were mixed to obtain 11 g of iron mixture A.
The following operations were performed according to the method described in Production Example 1. After soaking 20 g of dry rice seeds, rolling them using a simple seed coating machine and spraying water on the rice seeds with a dropper, the amount of about 1/4 of iron mixture A 11 g (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 so that almost all the amount of the iron mixture A added at one time was adhered to the rice seeds. Then, by repeating the same operation three times, 11 g of the iron mixture A was attached to rice seeds to form a coating layer. The total amount of water used for coating was 1.9 g. Next, while keeping the simple seed coating machine operating, the rolling state of rice seeds was maintained, 0.5 g of KTS-1 was added, and the seeds were attached to the outside of the coating layer. Spread the rice seed taken out from the simple seed coating machine so that it does not overlap the stainless steel vat, spray water with the rice seed three times a day for two days to accelerate the oxidation of iron, and then dry it. Thus, a coated rice seed (I) for comparison was obtained.

  Next, a test example is shown.

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

Test example 2
Gauze moistened with water 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 thermostat set at 17 ° C., and after 10 days, the presence or absence of germination was examined, and the germination rate was calculated by the following formula.
Germination rate (%) = number of germinated seeds / 50 x 100
Table 2 shows the results.

Test example 3
Ten seeds of coated rice were placed in a petri dish containing 50 mL of 3 times hard water, and the seeds were 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 3.

1 Shaft 2 Polyethylene cup 3 Stirrer 4 Stand

Claims (9)

A coating rice seed comprising a coating layer, the coating layer comprises a zinc oxide, iron oxide, a surfactant, a coating rice seeds comprising at least one selected from the following group (A) 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 iron oxide is in the range of 1: 200 to 1: 1. Coated rice seeds, wherein the content of at least one selected from the group is 0.01 to 5% by weight, and the content of the surfactant in the coated rice seeds is 0.1 to 1% by weight .
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer. A coated rice seed having a coating layer, wherein the coating layer contains zinc oxide, iron oxide and at least one selected from the following group (A), and a surfactant is retained on at least the surface thereof. The coated rice seeds thus obtained, wherein the zinc oxide has an average particle size in the range of 0.1 to 50 μm, and the weight ratio of zinc oxide to iron oxide is in the range of 1: 200 to 1: 1. The content of at least one selected from the following group (A) in the rice seed is in the range of 0.01 to 5% by weight, and the content of the surfactant in the coated rice seed is in the range of 0.1 to 1% by weight. Is coated rice seed .
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer.   The rice seed according to claim 1 or 2, wherein the coating layer has a first layer containing iron oxide and a second layer containing zinc oxide provided outside the first layer. Zinc oxide and iron oxide are included, the average particle diameter of zinc oxide is in the range of 0.1 to 50 μm , the weight ratio of zinc oxide and iron oxide is in the range of 1: 200 to 1: 1, and A powdery composition having an average particle size in the range of 0.01 to 150 μm. Look-containing zinc oxide, iron oxide, an acrylic resin, an average particle diameter in the range of 0.1~50μm of zinc oxide, the weight ratio of zinc oxide and iron oxide 1: 200 to 1: 1 And a powdery composition having an average particle diameter of 1 to 50 μm .   The composition according to claim 4 or 5, having an apparent specific gravity in the range of 0.30 to 2.50 g / mL. A kit for producing coated rice seeds, comprising zinc oxide, iron oxide, a surfactant, and at least one selected from the following group (A) , wherein the zinc oxide has an average particle size of 0.1 to 0.1: A kit for producing coated rice seeds, which has a thickness of 50 μm and a weight ratio of zinc oxide to iron oxide of 1: 200 to 1: 1 .
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer. A method for producing coated rice seeds, comprising the following steps , wherein 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 iron oxide is 1: 200 to 1: 1. The content of at least one selected from the following group (A) in the coated rice seeds is in the range of 0.01 to 5% by weight, and the content of the surfactant in the coated rice seeds is 0.1 to 5% by weight. A method for producing coated rice seeds, which is in the range of 1% by weight .
(1) At least one kind selected from the following group (A) by adding at least one kind of aqueous dispersion selected from the following group (A), zinc oxide, and iron oxide while rolling the rice seeds: And a step of forming a coating layer containing zinc oxide and iron oxide, (2) a surfactant is added while rolling the seed obtained in the step (1), and in the step (1), A step of holding a surfactant on the outside of the formed layer, and (3) a step of drying the seed obtained in the step (2).
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer. A method for producing coated rice seeds, comprising the following steps , wherein 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 iron oxide is 1: 200 to 1: 1. The content of at least one selected from the following group (A) in the coated rice seeds is in the range of 0.01 to 5% by weight, and the content of the surfactant in the coated rice seeds is 0.1 to 5% by weight. A method for producing coated rice seeds, which is in the range of 1% by weight .
(1) (I) At least one kind of water dispersion selected from the following group (A) and iron oxide are added while rolling the rice seeds, and at least one kind selected from the following group (A): A step of forming a coating layer containing iron oxide, and (II) at least one aqueous dispersion selected from the following group (A) while rolling the seed obtained in the step (I): A step of adding zinc oxide to form a coating layer containing zinc oxide and at least one selected from the following group (A) on the outside of the layer formed in the step (I), (2) the step While rolling the seed obtained in (1), a step of adding a surfactant to hold the surfactant outside the layer formed in the step (1), and (3) the step (2) ) A step of drying the seed obtained in (1).
Group (A): Group consisting of acrylic resin, vinyl acetate resin, urethane resin and butadiene copolymer.

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