TW201707554A - Coated rice seed and method for producing same - Google Patents

Abstract

Provided is a coated rice seed comprising a coating layer, said coating layer including: a polyvinyl alcohol having a degree of polymerization of 500 or more and having a degree of saponification in the range of 71.0-97.5 mol%; zinc oxide; bentonite; and a surfactant.

Description

Coated rice seed and preparation method thereof

The present invention relates to coated rice seeds and methods of making the same.

Direct seeding cultivation of rice is a cultivation method in which rice seeds are directly sprinkled on paddy fields. Since there is no need for seedling raising or transplanting, there is an advantage that the farming operation can be saved, and the like, but on the other hand, it is easy to suffer from birds such as ducks or sparrows. Disadvantages of agricultural damage (bird damage) caused by eating. Since the reduction in the emergence rate caused by bird damage will lead to a poor harvest, it is urgent to take countermeasures against birds. For example, a method for preventing bird damage by water management has been proposed, but it is necessary to change the management method depending on the type of bird (for example, refer to Non-Patent Document 1).

In addition, the technique of preventing the damage caused by the eating of the sparrows is known (for example, see Non-Patent Document 2). However, since the technique is to cure by oxidizing iron powder, it is necessary to dissipate heat generated during oxidation, and the management of the coated rice seeds is extremely troublesome; and if the management is insufficient, there is The problem of reduced germination rate. As a solution to such problems, for example, a high use is known. A technique of coating rice seeds with a coating material such as polyvinyl alcohol and iron oxide having a degree of saponification (see Patent Document 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-146266

[Non-patent literature]

[Non-Patent Document 1] Sakai Kazuo, three foreigners, "The prevention of bird damage in the cultivation of rice in the field of live water cultivation", The Hokuriku Crop Science, Japan Crop Society, March 31, 1999, Volume 34, p.59-61

[Non-Patent Document 2] Yamauchi Hiroshi, "Iron-coated Zhanshui Live Manual 2010", Independent Administrative Corporation Agriculture, Food Industry Technology Research Institute, Near China Four Agricultural Research Center, March 2010

However, the bird damage prevention effect of rice seeds coated with iron oxide is currently insufficient.

The present invention provides a coated rice seed which is less susceptible to bird damage and which can suppress the decrease in seed germination and germination rate.

The inventors of the present invention conducted research to solve such a problem, and found that if the rice seed has a degree of polymerization of 500 or more and the degree of saponification is 71.0~ The polyvinyl alcohol, zinc oxide, bentonite and surfactant in the range of 97.5 mol% are coated and sown in paddy fields to reduce bird damage, and sufficient seedling rate can be ensured for direct seeding cultivation of rice.

That is, the present invention is as follows.

[item 1]

A coated rice seed, which is a coated rice seed having a coating layer, wherein the coating layer comprises a polymerization degree of 500 or more and a degree of saponification of 71.0 to 97.5 mol% Vinyl alcohol, zinc oxide, bentonite and surfactant.

[item 2]

A coated rice seed, which is a coated rice seed having a coating layer, wherein the coating layer comprises a polymerization degree of 500 or more and a degree of saponification of 71.0 to 97.5 mol% Vinyl alcohol, zinc oxide and bentonite, and the surfactant is maintained at least on the surface.

[item 3]

The coated rice seed of item 1 or 2, wherein said coating layer comprises at least one selected from the group consisting of (A): consisting of titanium oxide, clay, zeolite, and calcium carbonate. group.

[item 4]

The coated rice seed according to Item 3, wherein the coating layer has a first layer containing at least one selected from the group (A) and a zinc oxide containing the outer layer provided on the outer side of the first layer. The second layer is made.

[item 5]

The coated rice seed according to any one of items 1 to 3, wherein the aforementioned coating The layer system further comprises iron oxide.

[item 6]

The coated rice seed according to Item 5, wherein the coating layer has a first layer containing iron oxide and a second layer containing zinc oxide disposed outside the first layer.

[item 7]

A powdery composition comprising polyvinyl alcohol, zinc oxide and bentonite having a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol%.

[item 8]

The powdery composition according to item 7, which comprises at least one selected from the group (A) below; and the group (A): a group consisting of titanium oxide, clay, zeolite, and calcium carbonate.

[item 9]

A powdery composition according to item 7 or 8, wherein the average particle diameter is in the range of 0.01 to 150 μm.

[item 10]

The powdery composition according to any one of items 7 to 9, wherein the apparent specific gravity is in the range of 0.30 to 2.50 g/mL.

[item 11]

The powdery composition according to any one of items 7 to 9, wherein the apparent specific gravity is in the range of 0.30 to 2.0 g/mL.

[item 12]

The powdery composition according to any one of items 7 to 11, which further contains iron oxide.

[item 13]

The powdery composition according to any one of items 7 to 12, wherein the zinc oxide has an average particle diameter of 0.01 to 100 μm.

[item 14]

A kit for producing coated rice seeds, which comprises at least a polyvinyl alcohol, zinc oxide, bentonite and a surfactant having a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol%.

[item 15]

The kit of item 14, which further comprises iron oxide.

[item 16]

The kit according to item 14 or 15, which has at least one selected from the group (A) below; and the group (A): a group composed of titanium oxide, clay, zeolite, and calcium carbonate.

[item 17]

A method for producing a coated rice seed, which comprises the steps of: (1) adding a polyethylene having a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed; The alcohol, the zinc oxide, the bentonite, and at least one selected from the group (A) below and water, and coating the polyvinyl alcohol, zinc oxide, bentonite, and at least one selected from the group (A) below a step of forming a layer; (2) a step of adding a surfactant while rotating the seed obtained in the above step (1) to maintain the surfactant on the outer side of the layer formed in the above step (1); 3) a step of drying the seed obtained in the aforementioned step (2); Group (A): a group consisting of titanium oxide, clay, zeolite, and calcium carbonate.

[item 18]

A method for producing a coated rice seed, which comprises the steps of: (1) (I) adding a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed; Polyvinyl alcohol, bentonite, at least one selected from the group (A) below and water, and formed of a coating layer containing at least one of the polyvinyl alcohol and bentonite and at least one selected from the group (A) below. Steps and (II) adding the polyvinyl alcohol, zinc oxide, bentonite, and water while rotating the seed obtained in the above step (I), and the outer side of the layer formed in the above step (I) includes the foregoing a step of forming a coating layer of polyvinyl alcohol, zinc oxide and bentonite; (2) adding a surfactant while rotating the seed obtained in the above step (1) to maintain the surfactant in the above step (1) a step of forming the outer side of the layer; and (3) a step of drying the seed obtained in the above step (2); and a group (A): a group consisting of titanium oxide, clay, zeolite, and calcium carbonate.

[item 19]

A coated rice seed produced by the method of manufacture of item 17 or 18.

[item 20]

A method for producing a coated rice seed, which comprises the steps of: (1) adding a polyethylene having a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed; Alcohol, zinc oxide, a step of forming iron oxide, bentonite and water to form a coating layer containing the aforementioned polyvinyl alcohol, zinc oxide, iron oxide and bentonite; (2) adding an interface activity while rotating the seed obtained in the above step (1) a step of maintaining the surfactant on the outer side of the layer formed in the above step (1); and (3) a step of drying the seed obtained in the above step (2).

[item 21]

A method for producing a coated rice seed, comprising the steps of: (1) (i) adding a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed; a step of forming a coating layer containing the polyvinyl alcohol, iron oxide, and bentonite, and (ii) rotating the seed obtained in the step (i) while polyvinyl alcohol, iron oxide, bentonite, and water are formed. a step of forming a coating layer containing the polyvinyl alcohol, zinc oxide and bentonite on the outer side of the layer formed in the above step (i) by adding the polyvinyl alcohol, zinc oxide, bentonite and water; (2) one side a step of rotating the seed obtained in the above step (1) while adding a surfactant to maintain the surfactant on the outer side of the layer formed in the above step (1); and (3) in the aforementioned step (2) The resulting seed is dried.

[item 22]

A coated rice seed produced by the method of manufacture of item 20 or 21.

The coated rice seed of the invention is not susceptible to bird damage, and can inhibit The floating and germination rate of the seed is reduced, and the seedling rate can be ensured for the direct seeding cultivation of rice.

1‧‧‧Axis

2‧‧‧Polyethylene cup

3‧‧‧Mixer

4‧‧‧ bracket table

Fig. 1 is an explanatory view for explaining a simple seed coating machine for coating a rice seed in the examples.

[Formation of the Invention]

The coated rice seed of the present invention (hereinafter referred to as a rice seed) has a coating layer characterized in that the coating layer contains a polymerization degree of 500 or more and a degree of saponification of 71.0 to 97.5 mol%. Polyvinyl alcohol (hereinafter referred to as PVA), zinc oxide, bentonite, and a surfactant, or the coating layer includes the PVA, zinc oxide, and bentonite, and the surfactant is at least retained on the surface.

In the present invention, the rice seed refers to a seed belonging to a variety generally cultivated by rice.

Examples of the variety include indica or japonica rice, and those having high lodging resistance or germination properties are preferred.

In the present invention, the PVA refers to a polymer having a structure represented by the following formula (1), and has a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol%.

However, m+n in the above formula (1) is the degree of polymerization, and {m/(m+n)}×100 (mol%) It is the degree of saponification. The degree of polymerization of the polyvinyl alcohol in the present invention is an average degree of polymerization calculated according to the polyvinyl alcohol test method specified in JIS K6726-1994, and the degree of polymerization of the PVA is preferably from 500 to 3,000, more preferably 1,000. ~2500, and even better range of 1500~2500. The degree of saponification of the polyvinyl alcohol in the present invention is a degree of saponification calculated according to the polyvinyl alcohol test method specified in JIS K6726-1994, and the degree of saponification of the PVA is preferably from 78.5 to 97.5 mol%, more preferably A range of 86.5 to 97.5 mol%. This PVA is commercially available, and as a commercially available PVA, for example, KURARAY POVAL PVA-220S (degree of polymerization: 2000, degree of saponification: 87.0 to 89.0 mol%, manufactured by KURARAY Co., Ltd.), KURARAY POVAL PVA- 205S (degree of polymerization: 500, degree of saponification: 86.5 to 89.0 mol%, manufactured by KURARAY Co., Ltd.) and Gohsenol GM-14S (degree of polymerization: 1000 to 1500, degree of saponification: 86.5 to 89.0 mol%, limited by Japanese synthetic chemical industry) Company system).

In the present invention, it is preferred to use a powdery polyvinyl alcohol, and it is preferred to use a polyvinyl alcohol having a particle size distribution of particles having a size of 180 μm or more and a particle size of 0.5% or less. In the present invention, the particle size distribution of the polyvinyl alcohol means a particle size distribution measured by a sieving method; the "particle size distribution of particles having a size of 180 μm or more is 0.5% or less", which means that the sieve has a pore size of 180 μm. The weight ratio to the whole is 0.5% or less. The particle size distribution of the polyvinyl alcohol can be placed on a sieve having a pore size of 180 μm (the test sieve specified in Japanese Industrial Standard (JIS) Z8801-1 having a diameter of 200 mm and a depth of 45 mm), and 10 g of polyvinyl alcohol is placed by the Rote After the sieve device such as a vibrator was sieved for 10 minutes, the weight of the polyvinyl alcohol remaining on the metering sieve was calculated according to the following formula.

Residual amount on the sieve (%) = weight of the polyvinyl alcohol remaining on the sieve (g) / weight of the polyvinyl alcohol initially placed on the sieve (g) × 100

The content of the present PVA in the rice seed is usually from 0.01 to 5% by weight, preferably from 0.01 to 3% by weight, more preferably from 0.1 to 2% by weight.

In the present invention, zinc oxide refers to a compound represented by ZnO, and commercially available zinc oxide can be used. As a commercially available zinc oxide, for example, zinc oxide 3N5 (manufactured by Kanto Chemical Co., Ltd.) and zinc oxide (manufactured by Nippon Chemical Industry Co., Ltd.) can be mentioned. In the present invention, zinc oxide having a purity of 99% or more (% by weight relative to the zinc oxide) is preferably used. The purity of zinc oxide can be determined by a test method specified in Japanese Industrial Standards (JIS) K1410. Further, powdered zinc oxide is usually used, and the zinc oxide has an average particle diameter of 0.01 to 100 μm, preferably 0.1 to 50 μm, more preferably 0.1 to 10 μm. In the present invention, the average particle diameter of zinc oxide is a particle diameter measured by a laser diffraction/scattering type particle size distribution measuring apparatus, and means a particle diameter having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle diameter of zinc oxide can be measured by a so-called wet type measurement method in which a zinc oxide particle is dispersed in water by using a Mastersizer 2000 (manufactured by Malvern) which is a laser diffraction/scattering type particle size distribution measuring apparatus. Seek.

The content of zinc oxide in the rice seed is usually from 0.005 to 80% by weight, preferably from 0.05 to 70% by weight, more preferably from 0.1 to 50% by weight. It is preferably in the range of 0.1 to 15% by weight in consideration of the growth of the plant and the influence on the environment.

In the present invention, bentonite refers to a clay mainly composed of montmorillonite. The sodium type bentonite in which the main cation of the smectite layer is sodium ion and the calcium type bentonite in which the cation is a calcium ion are mentioned. These bentonites are commercially available, and commercially available bentonites include, for example, bentonite spikes (manufactured by HOJUN Co., Ltd.) and Kunigel V1 (manufactured by KUNIMINE INDUSTRIES Co., Ltd.). In the present invention, it is preferred to use a powdery bentonite, and it is preferable to use a bentonite having a particle size distribution of particles having a size of 75 μm or more and a particle size of 20% or less. In the present invention, the particle size distribution of the bentonite refers to the particle size distribution measured by the sieving method; the so-called "particle size distribution of particles having a size of 75 μm or more is 20% or less", which means that the residual amount on the sieve having a pore diameter of 75 μm is relatively The weight ratio of the whole is 20% or less. The particle size distribution of the bentonite can be placed on a sieve having a pore diameter of 75 μm (the diameter of the frame is 200 mm, and the depth is 45 mm, the test sieve specified in Japanese Industrial Standards (JIS) Z8801-1), and 10 g of bentonite is placed on the sieve by a Rote-type vibrator or the like. After the sieve device was sieved for 10 minutes, the weight of the bentonite remaining on the metering sieve was calculated according to the following formula.

Residual amount on the sieve (%) = weight of bentonite remaining on the sieve (g) / weight of bentonite initially placed on the sieve (g) × 100

The content of the bentonite in the rice seed is usually from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight, more preferably from 0.1 to 3% by weight.

The surfactant in the present invention is preferably at least one selected from the group consisting of a nonionic surfactant and an anionic surfactant, and more preferably selected from the group consisting of polyoxyethylene alkyl ethers and polyoxyethylene aryl groups. At least one of the group consisting of phenyl ether and sulfonate. Further, the aforementioned polyoxyethylene aryl phenyl ether Preferred is polyoxyethylene polystyrene phenyl ether, and the sulfonate is preferably selected from the group consisting of naphthalene sulfonate and its formaldehyde condensate, phenol sulfonate and its formaldehyde condensate, and lignosulfonate. At least one of them.

Examples of the polyoxyethylene alkyl ether include polyoxyethylene stearyl ether and polyoxyethylene trilauryl ether. The polyoxyethylene polystyrylphenyl ether is exemplified by polyoxyethylene tristyrylphenyl ether. Examples of the naphthalenesulfonate and the formaldehyde condensate thereof include a formaldehyde condensate of sodium naphthalenesulfonate; and the phenolsulfonate and a formaldehyde condensate thereof include a formaldehyde condensate of sodium phenolsulfonate; The lignosulfonate is exemplified by sodium lignosulfonate. These surfactants are commercially available, and, for example, commercially available polyoxyethylene tristyrylphenyl ether, SORPOL 5080 (manufactured by Toho Chemical Industry Co., Ltd.); commercially available naphthalenesulfonic acid A sodium condensate of sodium is exemplified by New Kargen PS-P (manufactured by Takemoto Oil Co., Ltd.).

In the present invention, a powdery surfactant is preferably used, and a surfactant having a particle size distribution of 2% or less of particles having a size of 100 μm or more is preferably used. In the present invention, the particle size distribution of the surfactant means a particle size distribution measured by a sieving method; the so-called "particle size distribution of particles having a size of 100 μm or more is 2% or less", which means that the sieve has a pore size of 100 μm. The weight ratio of the amount to the total amount is 2% or less. The particle size distribution of the surfactant can be placed on the sieve having a pore size of 100 μm (the diameter of the frame is 200 mm, and the depth is 45 mm, the test sieve specified in Japanese Industrial Standards (JIS) Z8801-1), and 10 g of the surfactant is placed on the sieve. After the sieve device such as a vibrator was sieved for 10 minutes, the weight of the surfactant remaining on the metering sieve was calculated according to the following formula.

Residual amount on the sieve (%) = weight of the surfactant remaining on the sieve (g) / weight of the surfactant initially placed on the sieve (g) × 100

The content of the surfactant in the rice seed is usually from 0.002 to 6% by weight, preferably from 0.005 to 2% by weight, more preferably from 0.01 to 2% by weight.

The coating layer may contain at least one selected from the group (A) (hereinafter referred to as the inorganic compound). Examples of the clay in the inorganic compound include wax stone and kaolin. In addition, the inorganic compound is preferably at least one selected from the group consisting of clay and calcium carbonate, and is particularly preferably calcium carbonate.

In the present invention, it is preferred to use a powdery inorganic compound having an average particle diameter of usually 200 μm or less, preferably 150 μm or less. In the present invention, the average particle diameter of the present inorganic compound is a particle diameter measured by a laser diffraction/scattering type particle size distribution measuring apparatus, and means a particle diameter having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle diameter of the present inorganic compound can be measured by a Mastersizer 2000 (manufactured by Malvern) which is a laser diffraction/scattering type particle size distribution measuring apparatus, and a method of measuring the particles of the inorganic compound by dispersing it in water. Determined by measurement.

When two or more inorganic compounds different in average particle diameter selected from the group (A) are used as the present inorganic compound, the coating layer becomes a denser coating layer. The inorganic compounds may be the same or different in terms of two or more inorganic compounds having different average particle diameters.

When the coating layer contains the present inorganic compound, the content of the rice seed is usually 0.5 to 80% by weight, preferably 1 to 70% by weight, more Good range of 5 to 50% by weight.

The aforementioned coating layer may further comprise an agrochemical active ingredient. Examples of the agrochemical active ingredient include an insecticidal active ingredient, a bactericidal active ingredient, a herbicidal active ingredient, and a plant growth regulating active ingredient.

Examples of the insecticidal active ingredient include cotinine, edetamine, and acesulfame.

Examples of the bactericidal active ingredient include dysparin and florin.

The herbicidal active ingredient may, for example, be acesulfame or bromobutachlor.

As the plant growth regulating active ingredient, for example, paclobutrazol P can be mentioned.

In the present invention, it is preferred to use a powdery agrochemical active ingredient, which may be mixed with the present inorganic compound as needed, and pulverized into a powdery pesticide using a pulverizer such as a dry pulverizer. The average particle diameter of the powdery pesticide is usually 200 μm or less, preferably 150 μm or less. In the present invention, the average particle diameter of the powdery pesticide is a particle diameter measured by a laser diffraction/scattering type particle size distribution measuring apparatus, and means a particle diameter of 50% of the cumulative frequency in the volume reference frequency distribution. Further, the average particle diameter of the powdery pesticide when the powdery pesticide is a mixture with the inorganic compound means the average particle diameter of the mixture. The average particle diameter of the powdered pesticide can be a so-called wet method in which a particle of a powdery pesticide is dispersed in water by using a Mastersizer 2000 (manufactured by Malvern) which is a laser diffraction/scattering type particle size distribution measuring apparatus. Determined by measurement.

When the aforementioned coating layer contains a pesticidal active ingredient, in the rice seed The content thereof is usually 0.001 to 3% by weight, preferably 0.005 to 2% by weight, more preferably 0.01 to 2% by weight.

The aforementioned coating layer may further contain a colorant. As the coloring agent, for example, a pigment, a coloring matter, and a dye can be mentioned, and among them, a pigment is preferably used. As the pigment, a red or blue pigment is preferably used, and, for example, Ultramarine Nubix G-58 (blue pigment, manufactured by Nubiola Co., Ltd.) and Toda Color 300R (red pigment, manufactured by Toda Industries, Ltd.) are mentioned.

These ingredients used for the production of the rice seed may be used separately or may be mixed with all or at least two ingredients. The kit of the present invention (hereinafter referred to as the kit) has the PVA and zinc oxide and bentonite and a surfactant, and these may be contained in one container or may be contained in two or more containers. That is, the kit can include more than one container. When the kit contains more than two containers, different components can be loaded into each container. Further, the kit may contain other components (hereinafter referred to as component α) such as iron oxide, the present inorganic compound, and a pesticidal active ingredient.

The rice seed can be formed by coating a coating layer containing the present PVA, zinc oxide, bentonite, a surfactant, and any iron oxide or the present inorganic compound (hereinafter referred to as the coating layer 1) in rice seeds, or in rice. The seed is formed by forming a coating layer containing zinc oxide, bentonite, and any of the iron oxide or the present inorganic compound (hereinafter referred to as the coating layer 2), and then maintaining the surfactant on the surface.

The coating layer 1 is obtained by adding the PVA, zinc oxide, bentonite, and a surfactant while rotating the rice seed, and optionally adding iron oxide or the inorganic compound to adhere the rice seed. form. The coating layer 2 is formed by adding the PVA, zinc oxide, and bentonite while rotating the rice seed, and optionally adding iron oxide or the inorganic compound to adhere the rice seed. As a means for rotating the rice seeds, a device used in a conventional iron coating such as a coating machine can be used. The PVA, zinc oxide, bentonite, and a surfactant, and any of the iron oxide or the inorganic compound may be used singly or in combination of all or at least two components. When all the components are mixed, a powdery composition containing the present PVA, zinc oxide, bentonite, and a surfactant, and optionally iron oxide or the present inorganic compound is used. When at least two kinds of components are used in combination, for example, a powdery composition containing the present PVA, zinc oxide, and bentonite, and any iron oxide or the present inorganic compound, and a surfactant are used. Further, when the component α is used, the component α may be used singly, or the component α may be added to the powdery composition containing the PVA, zinc oxide, and bentonite, and any of the iron oxide or the inorganic compound.

Hereinafter, a method of using the powdery composition (hereinafter referred to as a powder composition Z) containing the PVA, zinc oxide, and bentonite to form the coating layer 2 and then maintaining the surfactant on the surface thereof is carried out. Description.

The coating layer 2 was formed on the rice seeds by adding the powdery composition Z and water while rotating the rice seeds. This PVA system acts as a binder (adhesive) to attach zinc oxide and bentonite to rice seeds. In the case of the rice seed, it is preferred that the surfactant is maintained at least on the surface thereof. After the rice seed forms the coating layer 2, the surfactant is added while maintaining the rotation state of the rice seed, and the rotation state is maintained. Thereby, a surfactant is attached to the outside of the coating layer 2, so that The surfactant is held on the surface.

In the case of using the present inorganic compound, the inorganic compound may be added to the powdery composition Z, or a powdery composition containing the PVA, bentonite, and the present inorganic compound (hereinafter referred to as a powdery composition Y) may be prepared. With the powder composition Z, add these separately.

When it is added individually, the powdery composition Y is added first, and then the powdery composition Z is added, whereby the first layer containing the inorganic compound and the zinc oxide containing the outer layer provided on the outer side of the first layer can be obtained. The second layer of this rice seed. Specifically, while the rice seed is rotated, the powdery composition Y and water are added, and the first layer containing the inorganic compound and the PVA and the bentonite is formed, and then the powder is added while maintaining the rotation state of the rice seed. The composition Z and water are formed on the outer side of the first layer by a second layer containing zinc oxide and the present PVA and bentonite.

A powdery composition containing the present PVA, zinc oxide and bentonite (hereinafter referred to as the composition (1)) is suitable as a powdery composition for coating rice seeds. The average particle diameter of the composition (1) is from 0.01 to 150 μm, preferably from 1 to 150 μm, more preferably from 5 to 150 μm. In the present invention, the average particle diameter of the composition (1) is a particle diameter measured by a laser diffraction/scattering type particle size distribution measuring device, and means a particle diameter of 50% of the cumulative frequency in the volume reference frequency distribution. . The average particle diameter of the composition (1) can be measured by dispersing particles of the composition (1) in water using a Mastersizer 2000 (manufactured by Malvern) which is a laser diffraction/scattering type particle size distribution measuring apparatus. The method is obtained by so-called wet measurement.

Moreover, the apparent specific gravity of the composition (1) is 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.50 to 2.0 g/mL, more preferably 0.60 to 1.7 g/mL. The larger the apparent specific gravity of the composition (1), the better the less likely to be scattered when the coated rice seeds are produced. In the present invention, the apparent specific gravity of the composition (1) is determined by a method according to the test method prescribed by the pesticide test method (physical test method, No. 71 of the Ministry of Agriculture and Forestry of February 3, 1947). In this method, a standard sieve of 8 mesh (a test sieve specified by Japanese Industrial Standard (JIS) Z8801-1 having a diameter of 200 mm and a depth of 45 mm) is placed on a metal cylindrical container having a diameter of 50 mm and 100 mL. , load the sample into it, and gently brush it with a brush to fill the container. Immediately use the slide glass to drop the remaining amount and measure the weight, and determine the weight of the contents, and calculate the apparent specific gravity according to the following formula. However, the distance between the screen and the upper edge of the container is 20 cm.

Apparent specific gravity (g/mL) = weight of contents / 100

The present composition (1) may also contain the present inorganic compound. When the present composition (1) contains the present inorganic compound, the weight ratio of the zinc oxide to the present inorganic compound in the composition (1) is usually from 1:1000 to 1000:1, preferably from 1:1000 to 100:1. More preferably, it is in the range of 1:200 to 10:1. If the plant growth and environmental impact are considered, it is preferably in the range of 1:200 to 1:3.

Hereinafter, after the present coating layer 2 is formed by using a powdery composition (hereinafter referred to as a powdery composition T) containing the PVA, zinc oxide, iron oxide, and bentonite, and a surfactant, the surfactant is held on the surface thereof. The method is explained.

Adding the powdery composition T and water while rotating the rice seeds, The present coating layer 2 is formed on rice seeds. This PVA system acts as a binder (bonding agent) to attach zinc oxide, iron oxide and bentonite to rice seeds. In the case of the rice seed, it is preferred that the surfactant is maintained at least on the surface thereof. After the rice seed forms the coating layer 2, the surfactant is added while maintaining the rotation state of the rice seed, and the rotation state is maintained. Thereby, a surfactant is adhered to the outside of the coating layer 2, and the surfactant can be held on the surface.

When the coating layer is formed by separately using iron oxide and zinc oxide separately, the PVA is added first, followed by the addition of zinc oxide, whereby the first layer containing iron oxide and the outer side provided on the first layer can be obtained. The rice seed comprising the second layer of zinc oxide. Specifically, while the rice seed is rotated, a powdery composition containing iron oxide and the PVA and water are added to form a first layer containing iron oxide and the PVA, and then, while maintaining the rotation state of the rice seed, A powdery composition containing zinc oxide and the present PVA and water are added, and a second layer containing zinc oxide and the PVA is formed on the outer side of the first layer.

A powdery composition containing the present PVA, zinc oxide, iron oxide, and bentonite (hereinafter referred to as the composition (2)) is suitably used as a powdery composition for coating rice seeds. The average particle diameter of the composition (2) is from 0.01 to 150 μm, preferably from 1 to 150 μm, more preferably from 1 to 60 μm. In the present invention, the average particle diameter of the composition (2) is a particle diameter measured by a laser diffraction ‧ scattering type particle size distribution measuring device, and means a particle diameter of 50% of the cumulative frequency in the volume reference frequency distribution. . The average particle diameter of the composition (2) can be used as a Mastersizer 2000 for a laser diffraction ‧ scattering type particle size distribution measuring device (manufactured by Malvern), which is obtained by a so-called wet type measurement method in which the particles of the composition (2) are dispersed in water and measured.

Further, the apparent specific gravity of the composition (2) is, for example, 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.30 to 2.20 g/mL, more preferably 0.50 to 2.20 g/mL. The larger the apparent specific gravity of the composition (2), the better the less likely to be scattered when the coated rice seeds are produced. In the present invention, the apparent specific gravity of the present composition (2) is obtained by a method according to the test method prescribed by the pesticide test method (physical test method, No. 71 of the Ministry of Agriculture and Forestry of February 3, 1947). In this method, a standard sieve of 8 mesh (a test sieve specified by Japanese Industrial Standard (JIS) Z8801-1 having a diameter of 200 mm and a depth of 45 mm) is placed on a metal cylindrical container having a diameter of 50 mm and 100 mL. , load the sample into it, and gently brush it with a brush to fill the container. Immediately use the slide glass to drop the remaining amount and measure the weight, and determine the weight of the contents, and calculate the apparent specific gravity according to the following formula. However, the distance between the screen 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 iron oxide in the composition (2) is usually from 1:1000 to 1000:1, preferably from 1:1000 to 100:1, more preferably from 1:200 to 10:1. If the plant growth and environmental impact are considered, it is preferably in the range of 1:200 to 1:3.

Examples of several of the present compositions (1) are shown below. In the following examples, % indicates the weight % relative to the composition (1). ‧ Polyvinyl alcohol, bentonite containing zinc oxide, a degree of polymerization of 500 to 3000, and a degree of saponification of 78.5 to 97.5 mol% selected from clay and carbon At least one of the group consisting of calcium acid has an average particle diameter of 0.01 to 150 μm and an apparent specific gravity of 0.30 to 2.0 g/mL; ‧ zinc oxide, a polymerization degree of 1000 to 2500, and a degree of saponification At least one of polyvinyl alcohol, bentonite, and a group selected from the group consisting of clay and calcium carbonate in an amount of 86.5 to 97.5 mol% has an average particle diameter of 1 to 150 μm and an apparent specific gravity of 0.50 to 2.0 g/mL. a composition comprising: an average particle of at least one selected from the group consisting of zinc oxide, a degree of polymerization of 1000 to 2500, and a degree of saponification of 86.5 to 97.5 mol%, and a mixture of polyvinyl alcohol, bentonite, and a group selected from the group consisting of clay and calcium carbonate. a powdery composition having a diameter of 5 to 150 μm and an apparent specific gravity of 0.60 to 1.7 g/mL; a polyvinyl alcohol having a zinc oxide, a degree of polymerization of 500 to 3,000, and a degree of saponification of 78.5 to 97.5 mol%, At least one of bentonite and a group selected from the group consisting of wax stone and calcium carbonate has a mean particle diameter of 0.01 to 150 μm and an apparent specific gravity of 0.30 to 2.0 g/mL; ‧ zinc oxide is included, and the degree of polymerization is Polyvinyl alcohol, bentonite having a saponification degree of 86.5 to 97.5 mol% and a group selected from the group consisting of wax stone and calcium carbonate One less powdery composition with an average particle size of 1 to 150 μm and an apparent specific gravity of 0.50 to 2.0 g/mL; ‧ zinc oxide, a degree of polymerization of 1500 to 2500, and a degree of saponification of 86.5 to 97.5 mol% a range of polyvinyl alcohol, bentonite, and at least one selected from the group consisting of wax stone and calcium carbonate having an average particle diameter of 5 to 150 μm and an apparent specific gravity of 0.60 to 1.7 g/mL; The average particle size of polyvinyl alcohol, bentonite and calcium carbonate in the range of 1500 to 2500, and the degree of saponification is 86.5 to 97.5 mol%. A powdery composition having a diameter of 5 to 150 μm and an apparent specific gravity of 0.60 to 1.7 g/mL; ‧ a zinc oxide containing 0.5 to 60%, a polymerization degree of 1,500 to 2,500, and a degree of saponification of 86.5 to 97.5 mol% Polyvinyl alcohol 0.5~3%, bentonite 1~5% and calcium carbonate 32~98% average particle size 5~50μm, apparent specific gravity 0.80~1.5g/mL powder composition; ‧including zinc oxide 2 ~50%, polymerization degree is 2000, and the degree of saponification is from 87.0 to 89.0 mol%, the polyvinyl alcohol is 0.5 to 3%, the bentonite is 1 to 5%, and the calcium carbonate is from 42 to 86.5%. The average particle size is 15 to 45 μm. A powdery composition having an apparent specific gravity of 1.0 to 1.3 g/mL; ‧ a zinc oxide of 48.3%, a degree of polymerization of 2000, and a degree of saponification of from 87.0 to 89.0 mol%, 1.0% of polyvinyl alcohol, and 2.4% of bentonite 48.3% of calcium carbonate constitutes a powdery composition having an average particle diameter of 16.4 μm; ‧ polyvinyl alcohol having a degree of polymerization of 24.1%, a degree of polymerization of 2000, and a degree of saponification of from 87.0 to 89.0 mol%, 1.0% of bentonite a powdery composition having an average particle diameter of 24.6 μm composed of 72.5% of calcium carbonate; ‧ 1.0% of polyvinyl alcohol having a degree of polymerization of 4.8%, a degree of polymerization of 2000, and a degree of saponification of 87.0 to 89.0 mol%, Bentonite 2.4% and calcium carbonate 91.8% a powdery composition having an average particle diameter of 42.7 μm and an apparent specific gravity of 1.2 g/mL; ‧ a polyvinyl alcohol containing zinc oxide, a degree of polymerization of 1,500 to 2,500, and a degree of saponification of 86.5 to 97.5 mol%, a powdery composition having an average particle diameter of bentonite and clay of 5 to 150 μm and an apparent specific gravity of 0.60 to 1.7 g/mL; ‧The average particle size of polyvinyl alcohol, bentonite and wax stone containing zinc oxide, the degree of polymerization is 1500~2500, and the degree of saponification is 86.5~97.5mol% is 5~150μm, and the apparent specific gravity is 0.60~1.7g/ The powdery composition of mL; ‧1~15% of zinc oxide, 2000 degree of polymerization, and saponification degree of 87.0~89.0mol% of polyvinyl alcohol 0.5~3%, bentonite 1~5% and waxstone 77 ~97.5% of the powdered composition having an average particle diameter of 1 to 30 μm and an apparent specific gravity of 0.60 to 1.2 g/mL; and ‧ from zinc oxide of 9.6%, a degree of polymerization of 2000, and a degree of saponification of 87.0 to 89.0 mol A powdery composition having an average particle diameter of 22.5 μm composed of 1.0% of polyvinyl alcohol, 2.4% of bentonite, and 87% of waxite in the range of %.

Examples of several of the present compositions (2) are shown below. In the following examples, % indicates the weight % relative to the composition (2). ‧ Polyvinyl alcohol, zinc oxide, iron oxide and bentonite having a polymerization degree of 500 to 3000 and a degree of saponification of 78.5 to 97.5 mol% have an average particle diameter of 1 to 60 μm and an apparent specific gravity of 0.50 to 2.20 g/ The powdery composition of mL; ‧containing polyvinyl alcohol and polyvinyl alcohol 0.5~3%, zinc oxide 1~60%, iron oxide 32 in the range of 500~3000, and the degree of saponification is 78.5~97.5mol% ~97.5% and bentonite 1~5% average particle size 5~60μm, apparent specific gravity 1.00~2.20g/mL powder composition; ‧including polymerization degree 1000~2500, and saponification degree 86.5~97.5 The range of mol% is 0.5~3% of polyvinyl alcohol, 3~50% of zinc oxide, 42~95.5% of iron oxide and 1~5% of bentonite are 15~50μm. A powdery composition having an apparent specific gravity of 1.20 to 2.20 g/mL; a polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification of from 87.0 to 89.0 mol%, 1.0% of zinc oxide, 48.3% of zinc oxide, and 48.3% of iron oxide. a powdery composition having an average particle diameter of 11.6 μm composed of 2.4% of bentonite; ‧ 2.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification of 87.0 to 89.0 mol%, 9.5% of zinc oxide, and iron oxide 86.1% and bentonite 2.4% of the average particle size of 11.2μm, an apparent specific gravity of 1.77g / mL of the powder composition; and ‧ by a degree of polymerization of 2000, and a degree of saponification of 87.0 ~ 89.0mol% A powdery composition comprising 1.0% of polyvinyl alcohol, 4.8% of zinc oxide, 91.8% of iron oxide and 2.4% of bentonite having an average particle diameter of 20.2 μm and an apparent specific gravity of 2.01 g/mL.

The method for producing the rice seed (hereinafter referred to as the production method) will be described. In the present manufacturing method, the rice seed line is usually used after being soaked. Seed soaking can be carried out as follows. First, the dried rice seeds are placed in a bag of a rice seed bag or the like and then immersed in water. In order to obtain coated rice seeds with higher germination rate, it is more suitable to soak the water temperature at 15~20 °C for 3-4 days.

After the rice seeds are taken out of the water, they are usually allowed to stand or the excess water on the surface thereof is removed by placing a dehydrator.

First, a method for producing coated rice seeds having a coating layer comprising the PVA and zinc oxide and bentonite and the present inorganic compound, and a surfactant is held on the surface thereof (hereinafter referred to as the production method) 1) Explain. The manufacturing method 1 has the following steps: (1) a step of forming a coating layer containing the PVA, zinc oxide, bentonite and the present inorganic compound by adding the PVA, zinc oxide, bentonite, the present inorganic compound and water while rotating the rice seed; (2) a step of adding a surfactant while rotating the seed obtained in the above step (1) to maintain the surfactant on the outer side of the layer formed in the above step (1); and (3) subjecting the above step (2) The step of drying the seed obtained in the process.

In the production method 1, first, a powdery composition (hereinafter referred to as a powdery composition X) containing the PVA, zinc oxide, bentonite, and the present inorganic compound is added while rotating the soaked rice seeds. A step of forming a coating layer containing the present PVA, zinc oxide, bentonite and the present inorganic compound (described as step 1 below). In step 1, water may be added, followed by addition of the powdered composition X, or the order may be reversed.

Further, water and a powdery composition X may be simultaneously added. Both the water and the powder composition X are added in such a manner that they are inverted on the rice seeds in a rotating state. As a method of adding water, any of dripping and spraying can be used. After the addition of water and powdery composition X, the rotation state of the rice seeds is maintained, and the PVA is used as a binder to adhere zinc oxide, bentonite and the present inorganic compound to the rice seeds.

The total amount of zinc oxide added in the production method 1 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, per 100 parts by weight of the dry rice seed. When the growth of the plant and the influence on the environment are considered, it is preferably in the range of 0.1 to 25 parts by weight. The total amount of the inorganic compound added is usually 1 to 200 parts by weight, preferably 1 to 150 parts by weight, based on 100 parts by weight of the dried rice seeds. The fraction is more preferably in the range of 1 to 100 parts by weight. The total amount of the powdery composition X added is usually 5 to 500 parts by weight, preferably 5 to 300 parts by weight, more preferably 10 to 200 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the PVA added is usually 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, per 100 parts by weight of the dry rice seed. Further, the weight ratio of the PVA to the powdery composition X is usually in the range of 1:200 to 1:10, preferably in the range of 1:150 to 1:20.

In the step 1, by uniformly adding the powdery composition X and repeating the step 1, a uniform coating layer can be formed. In this case, the first addition amount of the powdery composition X is usually 1 to 1/10, preferably about 1/2 to 1/5, of the total amount of the powdery composition X added. Further, 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 the powdery composition X added.

In the step 1, when the powdery composition X adheres to the inner wall of the apparatus or the like, it is scraped off by using a scraper or the like, and substantially the entire amount of the added powdery composition X can be attached to the rice seed.

After the step 1 is carried out, a step of adding the surfactant while rotating the seed obtained in the step 1 and holding the surfactant on the outer side of the layer formed in the step 1 (hereinafter referred to as step 2) is carried out. In step 2, after performing step 1, the surfactant is added while maintaining the rotation state of the rice seed, and the rotation state is maintained, so that the surfactant can be maintained in the coating containing the PVA, zinc oxide, bentonite and the present inorganic compound. The outside of the layer.

After the step 2 is carried out, the step of drying the seed obtained in the step 2 is carried out to obtain the rice seed. Specifically, after step 2 is carried out, the rice seeds are taken out from the apparatus, placed in a seedling box, and laid flat, and allowed to stand to be dried. Typically, it is dried to a moisture content of less than 20% (relative to the weight percent of the coated rice seed). In the present invention, the moisture content of the coated rice seeds refers to a value measured by drying 10 g of the sample at 105 ° C for 1 hour using an infrared moisture meter. As the infrared moisture meter, FD-610 manufactured by Kett Electric Laboratory can be used. Alternatively, a mat or a vinyl sheet may be used in place of the aforementioned seedling box, which is thinly laid flat and dried.

Next, the coating layer has a coating layer containing the PVA and zinc oxide and bentonite and the inorganic compound, and the coating layer has a first layer containing the inorganic compound and zinc oxide containing the outer layer provided on the outer side of the first layer. The second layer and the method for producing coated rice seeds (hereinafter referred to as the production method 2) in which the surfactant is held on the surface thereof will be described. The production method 2 has the following steps: (1) (I) adding the PVA, bentonite, the present inorganic compound and water while rotating the rice seed, and coating the PVA, the bentonite, and the present inorganic compound. The step of forming the layer and (II) adding the PVA, zinc oxide, bentonite and water while rotating the seed obtained in the step (I), and including the outer side of the layer formed in the step (I) a step of forming a coating layer of the PVA, zinc oxide and bentonite; (2) adding a surfactant while rotating the seed obtained in the step (1), and maintaining the surfactant in the step (1) The step of forming the outer side of the layer; And (3) a step of drying the seed obtained in the above step (2).

In the production method 2, first, a powdery composition (hereinafter referred to as a powdery composition W) containing water and a bentonite and the present inorganic compound is added to the immersed rice seed, and water is added thereto. A step of forming a coating layer containing the PVA, bentonite, and the present inorganic compound (hereinafter referred to as step I). The step I can be carried out in the same manner as in the first step of the production method 1 except that the powdery composition W is used instead of the powdery composition X. After carrying out the step I, the powdery composition containing the PVA, the zinc oxide and the bentonite (hereinafter referred to as the powder composition V) and water are added while the seed obtained in the step I is rotated, and in the step I, A step of forming a coating layer containing the PVA, zinc oxide, and bentonite on the outer side of the formed layer (hereinafter referred to as step II). Step II can be carried out in the same manner as in Step 1 except that the powdery composition V is used instead of the powdery composition W.

The total amount of zinc oxide added in the production method 2 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, per 100 parts by weight of the dry rice seed. When the growth of the plant and the influence on the environment are considered, it is preferably in the range of 0.1 to 25 parts by weight. The total amount of the inorganic compound added is usually from 1 to 200 parts by weight, preferably from 1 to 150 parts by weight, more preferably from 1 to 100 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the powdery composition V added is usually 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of powdered composition W added relative to dry rice seeds 100 parts by weight, usually 5 to 250 parts by weight, preferably 5 to 200 parts by weight, more preferably 5 to 150 parts by weight. The total amount of the PVA added is usually 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, per 100 parts by weight of the dry rice seed. Further, the weight ratio of the PVA to the powdery composition V is usually in the range of 1:200 to 1:10, preferably in the range of 1:150 to 1:20. The weight ratio of the PVA to the powder composition W is usually in the range of 1:200 to 1:10, preferably 1:1500 to 1:20.

After the step II is carried out, the step 2 of the production method 1 may be carried out in the same manner.

Next, a method for producing coated rice seeds (hereinafter referred to as the production method 3) in which the coating layer 2 is provided and the surfactant is held on the surface thereof will be described. The production method 3 has the following steps: (1) a step of forming the coating layer 2 by adding the PVA, zinc oxide, iron oxide, bentonite, and water while rotating the rice seed; (2) a step of rotating the seed obtained in the above step (1), adding a surfactant to maintain the surfactant on the outer side of the present coating layer 2 formed in the above step (1); and (3) subjecting the aforementioned steps The step of drying the seed obtained in (2).

In the production method 3, first, a step of forming the coating layer 2 by adding the powdery composition Z and water while rotating the soaked rice seeds is described (step 1). In step 1', water may be added, followed by addition of the powder composition T, or the order may be reversed. Also, At the same time, water and powder composition T are added. Both the water and the powder composition T are added in such a manner as to fall on the rice seeds in a rotating state. As a method of adding water, any of dripping and spraying can be used. After the addition of water and powder composition T, the rotation state of the rice seeds is maintained, and the PVA is used as a binder to adhere zinc oxide, iron oxide and bentonite to the rice seeds.

The total amount of zinc oxide added in the production method 3 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, per 100 parts by weight of the dried rice seeds. When the growth of the plant and the influence on the environment are considered, it is preferably in the range of 0.1 to 25 parts by weight. The total addition amount of the iron oxide is usually 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the powdery composition T to be added is usually 5 to 500 parts by weight, preferably 5 to 300 parts by weight, more preferably 10 to 200 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the PVA added is usually 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, per 100 parts by weight of the dry rice seed. Further, the weight ratio of the PVA to the powder composition T is usually in the range of 1:200 to 1:10, preferably in the range of 1:150 to 1:20.

In the step 1', a uniform coating layer can be formed by separately adding the powder composition T and repeating the step 1'. In this case, the amount of the powder composition T to be added once is usually 1 to 1/10, preferably about 1/2 to 1/5, of the total amount of the powder composition T. Further, the total amount of water added is usually 1/2 to 1/100, preferably 1/3 of the total amount of the powder composition T. ~1/10 or so.

In the step 1', when the powdery composition T adheres to the inner wall of the apparatus or the like, it is scraped off by using a scraper or the like, and substantially the entire amount of the added powdery composition T can be attached to the rice seed.

After the step 1' is carried out, a step of adding the surfactant while rotating the seed obtained in the step 1', and maintaining the surfactant on the outer side of the present coating layer 2 formed in the step 1' is carried out (hereinafter described) For step 2'). In the step 2', after the step 1' is carried out, the surfactant is added while maintaining the rotation state of the rice seed, and the state of rotation is maintained, whereby the surfactant can be held outside the coating layer 2.

After the step 2' is carried out, the step of drying the seed obtained in the step 2' is carried out to obtain the rice seed. Specifically, after performing step 2', the rice seeds are taken out from the apparatus, placed in a seedling box, and thinly laid, and allowed to stand to be dried. Typically, it is dried to a moisture content of less than 20% (relative to the weight percent of the coated rice seed). In the present invention, the moisture content of the coated rice seeds refers to a value measured by drying 10 g of the sample at 105 ° C for 1 hour using an infrared moisture meter. As the infrared moisture meter, FD-610 manufactured by Kett Electric Laboratory can be used. Alternatively, a mat or a vinyl sheet may be used in place of the aforementioned seedling box, which is thinly laid flat and dried.

Next, the present coating layer 2 has a first layer containing iron oxide and a second layer containing zinc oxide provided on the outer side of the first layer, and the surfactant is held by the coating layer 2 A method for producing coated rice seeds having the surface (hereinafter referred to as "manufacturing method 4") Bright. The production method 4 has the following steps: (1') (i) adding the PVA, iron oxide, bentonite, and water while rotating the rice seed to form a coating layer containing the PVA, iron oxide, and bentonite The step of forming and (ii) adding the PVA, zinc oxide, bentonite and water while rotating the seed obtained in the step (i), and including the present in the outer layer of the layer formed in the step (i) a step of forming a coating layer of PVA, zinc oxide and bentonite; (2') adding a surfactant while rotating the seed obtained in the above step (1') to maintain the surfactant in the aforementioned step (1') a step of the outer side of the layer formed; and (3') a step of drying the seed obtained in the aforementioned step (2').

In the production method 4, first, a powdery composition (hereinafter referred to as a powdery composition S) containing water and containing iron oxide and bentonite is added to the immersed rice seed, and water is added thereto. A step of forming a coating layer of the present PVA, iron oxide, and bentonite (hereinafter referred to as step i). The step i can be carried out in the same manner as in the step 1' of the production method 4 except that the powdery composition S is used instead of the powdery composition T. After the step i is carried out, the powdery composition containing the PVA, zinc oxide and bentonite (hereinafter referred to as the powder composition R) and water are added while rotating the seed obtained in the step i, and in the step i A step of forming a coating layer containing the PVA, zinc oxide, and bentonite on the outer side of the formed layer (hereinafter referred to as step ii). Step ii can be carried out in the same manner as in the step i except that the powdery composition R is used instead of the powdery composition S.

The total amount of zinc oxide added in the production method 4 is usually 0.01 to 200 parts by weight, preferably 0.01 to 200 parts by weight, based on 100 parts by weight of the dried rice seeds. 0.1 to 100 parts by weight, more preferably in the range of 0.1 to 50 parts by weight. When the growth of the plant and the influence on the environment are considered, it is preferably in the range of 0.1 to 25 parts by weight. The total addition amount of the iron oxide is usually 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the powdery composition S added is usually 5 to 250 parts by weight, preferably 5 to 150 parts by weight, more preferably 5 to 100 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the powdery composition R to be added is usually 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the PVA added is usually 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, per 100 parts by weight of the dry rice seed. Further, the weight ratio of the PVA to the powdery composition S is usually in the range of 1:200 to 1:10, preferably 1:150 to 1:20. The weight ratio of the PVA to the powder composition R is usually in the range of 1:200 to 1:10, preferably 1:150 to 1:20.

After the step II is carried out, the step 2' of the production method 3 may be carried out in the same manner.

The rice seed can be used for direct seeding cultivation of rice, and the method is carried out by directly spraying the rice seed on the paddy field. In the present invention, a paddy field refers to any type of paddy field that passes through Zhanshui and a paddy field that has been pumped. Specifically, it is based on the "Iron-coated Zhanshui Live Manual 2010" (Mr. Yamauchi, Independent Administrative Corporation Agriculture, Food Industry Technology Research Institute, Near China Four Agricultural Research Center, March 2010, Non-Patent Document 1) The method described is carried out. In this case, a live broadcast machine for iron coating such as Tetsumakichan (Kubota Co., Ltd.) or the like can be used. Thus, seeding is carried out by a general method, whereby good emergence can be achieved. Thereafter, the rice can be grown by maintaining the general cultivation conditions.

Further, pesticides and fertilizers may be applied before sowing, at the same time as planting, or after sowing. Examples of the agricultural chemical include a bactericide, an insecticide, a herbicide, and the like.

[Examples]

The invention is illustrated in more detail in accordance with examples.

First, the present manufacturing example and the comparative manufacturing example are shown.

In the following production examples and comparative production examples, the rice seeds were subjected to the use of Japanese solar rice seeds, and an oxidation of α-Fe ₂ O ₃ content of 78% and average particle diameter of 42.7 μm was used unless otherwise specified. iron. The manufacturing is carried out at room temperature (about 20 ° C). Further, % indicates % by weight.

Moreover, the brand names described in the production examples and the comparative production examples are as follows.

LPZINC-20: Zinc Oxide, manufactured by Suga Chemical Industry Co., Ltd., average particle size: 27.4 μm

Zinc Oxide 3N5: Zinc Oxide, manufactured by Kanto Chemical Co., Ltd., average particle size: 7.7 μm

Zinc Oxide Second: Zinc Oxide, manufactured by Nippon Chemical Industry Co., Ltd., average particle size: 0.24μm

Calcium carbonate G-100: Calcium carbonate, manufactured by Sankyo Fine Powder Co., Ltd., average particle size: 46.0 μm

Calcium carbonate granules: Calcium carbonate, manufactured by Yaoxian Lime Co., Ltd., average particle size: 6.2 μm

DL powder for wax powder, manufactured by Shengguangshan Mining Co., Ltd., average particle size: 30.3μm

Rutile Flower: titanium oxide, manufactured by KINSEI MATEC Co., Ltd., average particle size: 14.6 μm

Sun-zeolite MGF: Zeolite, Sun-zeolite Industries, Inc., average particle size: 116μm

Shengguangshan clay S: Wax stone, manufactured by Shengguangshan Mining Co., Ltd.

Bentonite spike height: montmorillonite, manufactured by HOJUN Co., Ltd.

DAE1K: iron powder, DOWA IP CREATION

KTS-1: calcined gypsum, manufactured by Yoshino Gypsum Trading Co., Ltd.

KURARAY POVAL PVA-220S: Polyvinyl alcohol, saponification degree: 87.0~89.0mol%, polymerization degree 2000, manufactured by KURARAY Co., Ltd.

Gohsenol GM-14S: polyvinyl alcohol, saponification degree: 86.5~89.0mol%, polymerization degree 1000~1500, made by Japan Synthetic Chemical Industry Co., Ltd.

KURARAY POVAL PVA-205S: Polyvinyl alcohol, saponification degree: 86.5~89.0 mol%, polymerization degree 500, manufactured by KURARAY Co., Ltd.

KURARAY POVAL PVA-224S: polyvinyl alcohol, saponification degree: 87.0~89.0 mol%, polymerization degree 2400, manufactured by KURARAY Co., Ltd.

SORPOL 5080: Polyoxyethylene tristyrylphenyl ether, manufactured by Toho Chemical Industry Co., Ltd.

Manufacturing example 1

First, a simple seed coating machine which can be applied when a rice seed is used in a small amount is produced. As shown in Fig. 1, a 500 mL-capacity polyethylene cup 2 was attached to the tip end of the shaft 1 and inserted into a drive shaft of a mixer 3 (THREE-ONE MOTOR, manufactured by Shinto Scientific Co., Ltd.) at an elevation angle of 45 degrees. In a manner, the agitator 3 is mounted obliquely on the holder table 4, thereby making a simple seed coating machine.

Next, a second powder of 2 g of zinc oxide, 0.2 g of Gohsenol GM-14S, and a spike of 0.25 g of bentonite were mixed to obtain a powdery composition (1).

About 100 mL of water was placed in a polyethylene cup having a capacity of 200 mL, and 20 g of dried rice seeds were added thereto, and the mixture was immersed for 10 minutes. Thereafter, the rice seeds were taken out from the water, excess water on the surface was removed, and the mixture was placed in a polyethylene cup 2 mounted in a simple seed coating machine. The rice seed was rotated by a simple seed coating machine with the number of rotations of the agitator 3 being 130 to 140 rpm, and the powdery composition (1) 2.45 g was added while spraying water on the rice seed by a sprayer. An amount of about 4/4 (about 0.6 g) was allowed to adhere to rice seeds. When the powdery composition (1) adheres to the inner wall of the polyethylene cup 2, it is scraped off using a spatula, so that substantially the entire amount of the powdery composition (1) added once is attached to the rice seed. . Thereafter, by repeating the same operation three times, 2.45 g of the powdery composition (1) was adhered to rice seeds to form a coating layer. The total amount of water used for coating was 2.4 g.

Next, the state of rotation of the rice seeds was maintained while the simple seed coating machine was operated, and 0.1 g of SORPOL 5080 was placed and attached to the outside of the coating layer.

The rice seeds taken out from the simple seed coating machine were laid flat on a stainless steel tray without being stacked, and allowed to dry overnight to obtain the coated rice seeds (1) of the present invention.

Manufacturing Example 2

The second type 2g of mixed zinc oxide, 0.1 g of KURARAY POVAL PVA-205S, and 0.25 g of bentonite ear were obtained to obtain a powdery composition (2).

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (2) 2.35 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding it to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (2) of the present invention is obtained. Further, the total amount of water used for coating was 0.5 g.

Manufacturing Example 3

A mixture of LPZINC-20 10g, KURARAY POVAL PVA-224S 0.1g, and bentonite ear 0.25g was obtained to obtain a powdery composition (3).

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (3) 10.35 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding it to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (3) of the present invention is obtained. Further, the total amount of water used for coating was 1.4 g.

Manufacturing Example 4

Mixed zinc oxide 3N5 5g, calcium carbonate G-100 5g, KURARAY 0.1 g of POVAL PVA-220S and 0.25 g of bentonite ear were obtained to obtain a powdery composition (4). The powder composition (4) had an average particle diameter of 16.4 μm.

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (4) 10.35 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding it to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (4) of the present invention is obtained. Further, the total amount of water used for coating was 2.8 g.

Manufacturing Example 5

10 g of zinc oxide 3N5, 10 g of calcium carbonate granules, 0.2 g of KURARAY POVAL PVA-220S, and 0.5 g of bentonite ear height were obtained to obtain a powdery composition (5). The average particle diameter of the powdery composition (5) was 8.2 μm.

The following operations were carried out in accordance with the method described in Production Example 1. 20.7 g of the above-mentioned powdery composition (5) was used instead of 2.45 g of the powdery composition (1), and after it was divided into four equal parts and added to form a coating layer, SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (5) of the present invention is obtained. Further, the total amount of water used for coating was 5.6 g.

Manufacturing Example 6

20 g of zinc oxide 3N5, 20 g of calcium carbonate granules, 0.4 g of KURARAY POVAL PVA-220S, and 1.0 g of bentonite ear height were obtained to obtain a powdery composition (6). The powder composition (6) had an average particle diameter of 8.2 μm.

The following operations were carried out in accordance with the method described in Production Example 1. Using the above powdery composition (6) 41.4g instead of the powdery composition (1) 2.45g, After the film was divided into four equal parts and added to form a coating layer, SORPOL 5080 0.1 g was attached to the outside thereof to obtain the coated rice seed (6) of the present invention. Further, the total amount of water used for coating was 10.3 g.

Manufacturing Example 7

Mixed zinc oxide 3N5 1g, Rutile Flower 9g, KURARAY POVAL PVA-220S 0.1g, and bentonite ear 0.25g were obtained to obtain a powdery composition (7). The average particle diameter of the powdery composition (7) was 15.1 μm.

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (7) 10.35 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding it to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (7) of the present invention is obtained. Further, the total amount of water used for coating was 1.4 g.

Manufacturing Example 8

Mixed zinc oxide 3N5 1g, Sun-zeolite MGF 9g, KURARAY POVAL PVA-220S 0.1g, and bentonite ear 0.25g were obtained to obtain a powdery composition (8). The powder composition (8) had an average particle diameter of 131.1 μm.

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (8) 10.35 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (8) of the present invention is obtained. Further, the total amount of water used for coating was 4.2 g.

Manufacturing Example 9

Mixed zinc oxide 3N5 1g, clay powder DL 9g, KURARAY POVAL PVA-220S 0.1g, and bentonite ear height 0.25g to obtain a powdery composition (9). The powder composition (9) had an average particle diameter of 22.5 μm.

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (9) 10.35 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding it to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (9) of the present invention is obtained. Further, the total amount of water used for coating was 2.4 g.

Manufacturing Example 10

The second 0.1 g of zinc oxide, 9.9 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite were mixed to obtain a powdery composition (10). The powdery composition (10) had an average particle diameter of 44.5 μm and an apparent specific gravity of 1.2 g/mL.

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (10) 10.35 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (10) of the present invention is obtained. Further, the total amount of water used for coating was 2.3 g.

Manufacturing Example 11

Mixing 70.0 parts by weight of (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3- Methyl-2-nitroguanidine (general name: cotinine) and 30.0 parts by weight of Shengguangshan clay S were pulverized by a centrifugal pulverizer to obtain a powdery pesticide A. The particle size of the powdery pesticide A obtained by wet measurement using Mastersizer 2000 (manufactured by Malvern) was 13.0 μm.

Mixed powder zinc oxide 3N5 5g, calcium carbonate G-100 5g, KURARAY POVAL PVA-220S 0.1g, bentonite ear height 0.25g, and powdered pesticide A 0.086g were obtained to obtain a powdery composition (11).

The following operations were carried out in accordance with the method described in Production Example 1. Using the above-mentioned powdery composition (11) 10.436 g instead of the powdery composition (1) 2.45 g, the operation was carried out by dividing it into four equal parts and adding it to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (11) of the present invention is obtained. Further, the total amount of water used for coating was 3.9 g.

Manufacturing Example 12

Mixed powder zinc oxide 3N5 5g, calcium carbonate G-100 5g, KURARAY POVAL PVA-220S 0.1g, bentonite ear height 0.25g, and SORPOL 5080 0.01g were obtained to obtain a powdery composition (12).

The following operations were carried out in accordance with the method described in Production Example 1. The coating layer was formed by using the above-mentioned powder composition (12) 10.36 g instead of the powder composition (1) 2.45 g, which was subjected to an operation of dividing it into four equal portions, thereby obtaining the coated layer of the present invention. Rice seeds (12). Further, the total amount of water used for coating was 2.3 g.

Manufacturing Example 13

The Rutile Flower 5g, KURARAY POVAL PVA-224S 0.1g, and the bentonite ear height of 0.15 g were mixed to obtain a powdery composition (13-1).

Further, 5 g of zinc oxide 3N5, 0.1 g of KURARAY POVAL PVA-224S, and a spike height of bentonite of 0.15 g were mixed to obtain a powdery composition (13-2).

The following operations were carried out in accordance with the method described in Production Example 1. After immersing the dried rice seeds in 20 g, the machine was rotated by a simple seed coating machine, and water was sprayed on the rice seeds with a sprayer to add about 1/4 of the 5.25 g of the powdery composition (13-1) (about 1.3). g), attach it to rice seeds. When the powdery composition (13-1) adheres to the inner wall of the polyethylene cup 2, it is scraped off using a spatula, so that substantially the total amount of the powdery composition (13-1) added once is added. Attached to rice seeds. Then, by repeating the same operation three times, 5.25 g of the powdery composition (13-1) was adhered to the rice seed, and the first coating layer containing Rutile Flower (hereinafter referred to as the first coating layer) was formed. form. The total amount of water used for coating was 1.3 g.

Then, while the state of the rice seed is being rotated, the water is sprayed on the rice seed by a sprayer, and about 1/4 of the 5.25 g of the powdery composition (13-2) is added. (about 1.3 g), it was attached to the outer side of the first layer. When the powdery composition (13-2) adheres to the inner wall of the polyethylene cup 2, it is scraped off using a spatula, so that substantially the total amount of the powdery composition (13-2) added once is added. Attached to rice seeds. Thereafter, by repeating the same operation three times, 5.25 g of the powdery composition (13-2) was attached to the outside of the first layer, and the second coating layer containing zinc oxide was applied to the outside of the first layer. (The second layer is described below). The total amount of water used for coating was 2.9 g.

Next, the state of rotation of the rice seeds was maintained while the simple seed coating machine was operated, and 0.1 g of SORPOL 5080 was placed and attached to the outside of the second layer. The rice seeds taken out from the simple seed coating machine were spread on a stainless steel tray without being stacked, and allowed to dry overnight to obtain the coated rice seeds (13) of the present invention.

Manufacturing Example 14

Mixed zinc oxide 3N5 5g, iron oxide 5g, KURARAY POVAL PVA-220S 0.1g, and bentonite ear height 0.25g to obtain a powdery composition (14). The powder composition (14) had an average particle diameter of 11.6 μm.

About 100 mL of water was placed in a polyethylene cup having a capacity of 200 mL, and 20 g of dried rice seeds were added thereto, and the mixture was immersed for 10 minutes. Thereafter, the rice seeds were taken out from the water, excess water on the surface was removed, and the mixture was placed in a polyethylene cup 2 mounted in a simple seed coating machine. The rice seed was rotated by a simple seed coating machine with a rotation number of the agitator 3 in the range of 130 to 140 rpm, and a powdery composition (14) of 10.35 g was added while spraying water on the rice seed by a sprayer. The amount of about 4/4 (about 2.6 g) was allowed to adhere to rice seeds. When the powdery composition (14) adheres to the inner wall of the polyethylene cup 2, it is scraped off using a spatula, so that substantially the entire amount of the powdery composition (14) added once is attached to the rice seed. . Thereafter, by repeating the same operation three times, 10.35 g of the powdery composition (14) was adhered to the rice seeds to form a coating layer. The total amount of water used for coating was 1.7 g. Next, the state of rotation of the rice seeds is maintained while the simple seed coating machine is being actuated, and the input is made. SORPOL 5080 0.1 g was attached to the outside of the aforementioned coating layer. The rice seeds taken out from the simple seed coating machine were laid flat on a stainless steel tray without being stacked, and allowed to dry overnight to obtain the coated rice seeds (14) of the present invention.

Manufacturing Example 15

The second type 2g of zinc oxide, 18 g of iron oxide, 0.2 g of KURARAY POVAL PVA-220S, and 0.5 g of bentonite were mixed to obtain a powdery composition (15). The powdery composition (15) had an average particle diameter of 8.1 μm and an apparent specific gravity of 1.77 g/mL.

The following operations were carried out in accordance with the method described in Production Example 14. 20.7 g of the powdery composition (15) was used instead of 10.35 g of the powdery composition (14), and after it was divided into four equal parts and added to form a coating layer, SORPOL 5080 0.2 g was attached to the outside thereof. The coated rice seed (15) of the present invention is obtained. Further, the total amount of water used for coating was 3.5 g.

Manufacturing Example 16

The second zinc oxide 1g, iron oxide 9g, KURARAY POVAL PVA-220S 0.2g, and bentonite ear 0.25g were mixed to obtain a powdery composition (16). The powdery composition (16) had an average particle diameter of 11.3 μm and an apparent specific gravity of 1.77 g/mL.

The following operations were carried out in accordance with the method described in Production Example 14. Using the above-mentioned powdery composition (16) 10.45 g instead of the powdery composition (14) 10.35g, after the operation was carried out by dividing it into four equal parts and adding a coating layer, SORPOL 5080 0.1 g was attached to the outer side thereof to obtain the coated rice seed (16) of the present invention. Further, the total amount of water used for coating was 1.9 g.

Manufacturing Example 17

The second zinc oxide 1g, iron oxide 9g, Gohsenol GM-14S 0.1g, and bentonite ear 0.25g were mixed to obtain a powdery composition (17). The powder composition (17) had an average particle diameter of 8.5 μm.

The following operations were carried out in accordance with the method described in Production Example 14. Using 10.35 g of the above-mentioned powdery composition (17) instead of 10.35 g of the powdery composition (14), the operation was carried out by dividing it into four equal parts and adding to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (17) of the present invention is obtained. Further, the total amount of water used for coating was 2.1 g.

Manufacturing Example 18

The second zinc oxide 1g, the iron oxide 9g, the KURARAY POVAL PVA-224S 0.1g, and the bentonite ear 0.25g were mixed to obtain a powdery composition (18). The powder composition (18) had an average particle diameter of 7.9 μm.

The following operations were carried out in accordance with the method described in Production Example 14. The powder composition (18) 10.35g was used instead of the powder composition (14) 10.35g, and after it was divided into four equal parts and added to form a coating layer, SORPOL 5080 0.1g was attached to the outside. And get the invention Coated rice seeds (18). Further, the total amount of water used for coating was 2.0 g.

Manufacturing Example 19

The second type 2g of zinc oxide, 0.2 g of iron oxide, 0.1 g of KURARAY POVAL PVA-205S, and 0.25 g of bentonite ear were mixed to obtain a powdery composition (19). The powdery composition (19) had an average particle diameter of 3.1 μm and an apparent specific gravity of 0.61 g/mL.

The following operations were carried out in accordance with the method described in Production Example 14. Using the above-mentioned powder composition (19) 2.55 g instead of the powder composition (14) 10.35 g, the operation was carried out by dividing it into four equal parts and adding to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (179) of the present invention is obtained. Further, the total amount of water used for coating was 0.6 g.

Manufacturing Example 20

The second 0.5 g of zinc oxide, 9.5 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite were mixed to obtain a powdery composition (20). The powdery composition (20) had an average particle diameter of 20.2 μm and an apparent specific gravity of 2.01 g/mL.

The following operations were carried out in accordance with the method described in Production Example 14. Using the above-mentioned powder composition (20) 10.35 g instead of the powder composition (14) 10.35 g, the operation was carried out by dividing it into four equal parts and adding to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. And get the invention Coated rice seeds (20). Further, the total amount of water used for coating was 1.7 g.

Manufacturing Example 21

Mix 70.0 parts by weight of (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroindole (general name: cotinine) and 30.0 weight After the Shouguangshan clay S, it was pulverized by a centrifugal pulverizer to obtain a powdery pesticide B. The particle size of the powdery pesticide B determined by wet measurement using Mastersizer 2000 (manufactured by Malvern) was 13.0 μm.

The powdery composition (21) was obtained by mixing the second zinc oxide 1g, the iron oxide 9g, the KURARAY POVAL PVA220S 0.1g, the bentonite ear height 0.25g, and the powdery pesticide B0.086g. The powder composition (21) had an average particle diameter of 9.6 μm.

The following operations were carried out in accordance with the method described in Production Example 14. Using the above-mentioned powdery composition (21) 10.436 g instead of the powdery composition (14) 10.35 g, the operation was carried out by dividing it into four equal parts and adding to form a coating layer, and SORPOL 5080 0.1 g was attached to the outside thereof. The coated rice seed (21) of the present invention is obtained. Further, the total amount of water used for coating was 1.9 g.

Manufacturing Example 22

9 g of iron oxide, 0.09 g of Gohsenol GM-14S, and 0.225 g of bentonite were mixed to obtain a powdery composition (22-1).

In addition, mixed zinc oxide 3N5 1g, Gohsenol GM-14S 0.01g and The bentonite spike height was 0.025 g to obtain a powdery composition (22-2).

The following operations were carried out in accordance with the method described in Production Example 14. After immersing the dried rice seeds in 20 g, the machine was rotated by a simple seed coating machine, and water was sprayed on the rice seeds with a sprayer to add about 1/4 of the 9.315 g of the powdery composition (22-1) (about 2.3). g), attach it to rice seeds. When the powdery composition (22-1) adheres to the inner wall of the polyethylene cup 2, it is scraped off using a spatula, so that substantially the total amount of the powdery composition (22-1) added once is added. Attached to rice seeds. Then, by repeating the same operation three times, 9.315 g of the powdery composition (22-1) was adhered to the rice seed, and the first coating layer containing iron oxide (hereinafter referred to as the first coating layer) was prepared. form. The total amount of water used for coating was 0.6 g.

Then, while the state of the rice seed is being rotated, the water is sprayed on the rice seed by a sprayer, and about 1/4 of the 1.035 g of the powdery composition (22-2) is added. (about 0.26 g), it was attached to the outer side of the first layer. When the powdery composition (22-2) adheres to the inner wall of the polyethylene cup 2, it is scraped off using a spatula, so that substantially the total amount of the powdery composition (22-2) added once is added. Attached to rice seeds. Thereafter, by repeating the same operation three times, 1.035 g of the powdery composition (22-2) was adhered to the outside of the first layer, and a second coating layer containing zinc oxide was formed on the outer side of the first layer. (The following is described as the second layer). The total amount of water used for coating was 0.9 g.

Next, the state of rotation of the rice seeds was maintained while the simple seed coating machine was operated, and 0.1 g of SORPOL 5080 was placed and attached to the outside of the second layer. Rice seeds taken from a simple seed coating machine The coated rice seeds (22) of the present invention were obtained by flattening on a stainless steel tray without stacking and allowing to dry overnight.

Comparative manufacturing example 1

DAE1K 10g and KTS-1 1g were mixed to obtain 11 g of an iron mixture A.

The following operations were carried out in accordance with the method described in Production Example 1. After immersing 20 g of dried rice seeds, it was rotated by a simple seed coating machine, and water was sprayed on the rice seeds while using a dropper to add about 1/4 of an iron mixture A 11 g (about 2.8 g) to adhere thereto. On rice seeds. When the iron mixture A adheres to the inner wall of the polyethylene cup 2, it is scraped off using a spatula, so that substantially the entire amount of the iron mixture A added once is attached to the rice seed. Thereafter, by repeating the same operation three times, the iron mixture A 11g was attached to the rice seed to form a coating layer. The total amount of water used for coating was 1.9 g. Next, the state of rotation of the rice seeds was maintained while the simple seed coating machine was operated, and 0.5 g of KTS-1 was placed and attached to the outside of the coating layer. The rice seeds taken out from the simple seed coating machine were laid flat on a stainless steel platter without being stacked, and the operation of spraying the rice seeds three times a day for two days was carried out to promote the oxidation of iron. Thereafter, it was dried to obtain a comparative coated rice seed (I).

Test examples are shown below.

Test example 1

About 30 g of soil was placed in a plastic petri dish, and 50 pieces of the coated rice seeds were spread on the soil surface after being wetted with water. The plastic culture dish was placed outside the house, and the condition of the plastic culture dish was observed by photographing with a time-lapse photography camera, and the coated rice seeds remaining after 1 day of seeding were counted, and the residual rate was calculated from the following formula.

Residual rate (%) = number of coated rice seeds remaining after 1 day of sowing / 50 × 100

The results are shown in Table 1. Further, the rice seeds (control group) in Table 1 refer to uncoated rice seeds, and since the seeds are lost by eating by birds such as sparrows, the residual ratio is 0%.

Test example 2

A gauze dampened with water was placed in a plastic petri dish, and 20 coated rice seeds were sprayed thereon. The plastic petri dish was capped, placed in a thermostat set at 17 ° C, and the presence or absence of germination was examined 10 days later, and the germination rate was calculated from the following formula.

Germination rate (%) = number of seeds germinated / 50 × 100

The results are shown in Table 2.

Test Example 3

10 pieces of the coated rice seeds were placed in a petri dish containing 3 mL of hard water of 50 mL, 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 3.

Test Example 4

About 30 g of soil was placed in a plastic petri dish, and 50 pieces of the coated rice seeds were spread on the soil surface after being wetted with water. Culture the plastic The dish was placed outside the house, and the condition of the plastic dish was observed by photographing with a time-lapse camera. The coated rice seeds remaining after one day of seeding were counted, and the residual rate was calculated from the following formula.

Residual rate (%) = number of coated rice seeds remaining after 1 day of sowing / 50 × 100

The results are shown in Table 4. Further, the rice seeds (control group) in Table 4 refer to uncoated rice seeds, and since the seeds are lost by eating by birds such as sparrows, the residual ratio is 0%.

Test Example 5

A gauze dampened with water was placed in a plastic petri dish, and 20 coated rice seeds were sprayed thereon. The plastic petri dish was capped, placed in a thermostat set at 17 ° C, and the presence or absence of germination was examined 10 days later, and the germination rate was calculated from the following formula.

Germination rate (%) = number of seeds germinated / 50 × 100

The results are shown in Table 5.

Test Example 6

10 pieces of the coated rice seeds were placed in a petri dish containing 3 mL of hard water of 50 mL, 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 6.

Claims (22)

A coated rice seed, which is a coated rice seed having a coating layer, wherein the coating layer comprises a polymerization degree of 500 or more and a degree of saponification of 71.0 to 97.5 mol% Vinyl alcohol, zinc oxide, bentonite and surfactant. A coated rice seed, which is a coated rice seed having a coating layer, wherein the coating layer comprises a polymerization degree of 500 or more and a degree of saponification of 71.0 to 97.5 mol% Vinyl alcohol, zinc oxide and bentonite, and the surfactant is maintained at least on the surface. The coated rice seed of claim 1 or 2, wherein said coating layer comprises at least one selected from the group consisting of: (A): consisting of titanium oxide, clay, zeolite, and calcium carbonate Group. The coated rice seed according to claim 3, wherein the coating layer has a first layer containing at least one selected from the group (A) and a zinc oxide containing the outer layer provided on the outer side of the first layer The second layer is made. The coated rice seed of any one of claims 1 to 3, wherein the coating layer further comprises iron oxide. The coated rice seed according to claim 5, wherein the coating layer comprises a first layer containing iron oxide and a second layer containing zinc oxide disposed outside the first layer. A powdery composition comprising polyvinyl alcohol, zinc oxide and bentonite having a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol%. The powdery composition of claim 7, which comprises a group selected from the group consisting of At least one of (A); Group (A): a group consisting of titanium oxide, clay, zeolite, and calcium carbonate. The powdery composition of claim 7 or 8, wherein the average particle diameter is in the range of 0.01 to 150 μm. The powdery composition according to any one of claims 7 to 9, wherein the apparent specific gravity is in the range of 0.30 to 2.50 g/mL. The powdery composition according to any one of claims 7 to 9, wherein the apparent specific gravity is in the range of 0.30 to 2.0 g/mL. The powdery composition according to any one of claims 7 to 11, which further contains iron oxide. The powdery composition according to any one of claims 7 to 12, wherein the zinc oxide has an average particle diameter in the range of 0.01 to 100 μm. A kit for producing coated rice seeds, which comprises at least a polyvinyl alcohol, zinc oxide, bentonite and a surfactant having a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol%. The kit of claim 14 further comprising iron oxide. The kit according to claim 14 or 15, which has at least one selected from the group (A) below; and the group (A): a group composed of titanium oxide, clay, zeolite, and calcium carbonate. A method for producing a coated rice seed, which comprises the steps of: (1) adding a polyethylene having a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed; Alcohol, oxidation Zinc, bentonite, at least one selected from the group (A) below and water, and formed of a coating layer containing at least one selected from the group consisting of polyvinyl alcohol, zinc oxide, and bentonite selected from the group (A) below. Step (2) a step of adding a surfactant while rotating the seed obtained in the above step (1) to maintain the surfactant on the outer side of the layer formed in the above step (1); and (3) The step of drying the seed obtained in the above step (2); the group (A): a group consisting of titanium oxide, clay, zeolite, and calcium carbonate. A method for producing a coated rice seed, which comprises the steps of: (1) (I) adding a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed; Polyvinyl alcohol, bentonite, at least one selected from the group (A) below and water, and formed of a coating layer containing at least one of the polyvinyl alcohol and bentonite and at least one selected from the group (A) below. Steps and (II) adding the polyvinyl alcohol, zinc oxide, bentonite, and water while rotating the seed obtained in the above step (I), and the outer side of the layer formed in the above step (I) includes the foregoing a step of forming a coating layer of polyvinyl alcohol, zinc oxide and bentonite; (2) adding a surfactant while rotating the seed obtained in the above step (1) to maintain the surfactant in the above step (1) a step of forming the outer side of the layer; and (3) a step of drying the seed obtained in the above step (2); and a group (A): a group consisting of titanium oxide, clay, zeolite, and calcium carbonate. A coated rice seed produced by the method of manufacture of claim 17 or 18. Method for producing coated rice seeds, which has the following Steps: (1) Adding polyvinyl alcohol, zinc oxide, iron oxide, bentonite, and water in a polymerization degree of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed, and including a step of forming a coating layer of polyvinyl alcohol, zinc oxide, iron oxide and bentonite; (2) adding a surfactant while rotating the seed obtained in the above step (1) to maintain the surfactant in the aforementioned step a step of (1) the outer side of the layer formed; and (3) a step of drying the seed obtained in the above step (2). A method for producing a coated rice seed, comprising the steps of: (1) (i) adding a degree of polymerization of 500 or more and a degree of saponification of 71.0 to 97.5 mol% while rotating the rice seed; a step of forming a coating layer containing the polyvinyl alcohol, iron oxide, and bentonite, and (ii) rotating the seed obtained in the step (i) while polyvinyl alcohol, iron oxide, bentonite, and water are formed. a step of forming a coating layer containing the polyvinyl alcohol, zinc oxide and bentonite on the outer side of the layer formed in the above step (i) by adding the polyvinyl alcohol, zinc oxide, bentonite and water; (2) one side a step of rotating the seed obtained in the above step (1) while adding a surfactant to maintain the surfactant on the outer side of the layer formed in the above step (1); and (3) in the aforementioned step (2) The resulting seed is dried. A coated rice seed produced by the manufacturing method of claim 20 or 21.