JP6786854B2 - Coated rice seeds and their manufacturing method - Google Patents

Description

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

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

Japanese Unexamined Patent Publication No. 2013-146266

Nagao Sakai, 3 outsiders, "Measures to prevent cultivated bird damage in direct sowing cultivation of paddy rice", Hokuriku Crop Science, Japan Crop Science, March 31, 1999, Vol. 34, p. 59-61 Minoru Yamauchi, "Iron Coating Flooded Direct Seeding Manual 2010", Incorporated Administrative Agency Agricultural and Food Industry Technology Research Organization Kinki Chugoku-Shikoku Agricultural Research Center, March 2010

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

As a result of studies to solve such a problem, the present inventor oxidized rice seeds with polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%. It was found that when seeding in paddy fields by coating with zinc, bentonite, and a surfactant, bird damage is reduced and a sufficient seedling standing rate can be secured in direct sowing cultivation of paddy rice.
That is, the present invention is as follows.
[1] A coated rice seed having a coating layer, wherein the coating layer is polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%. Coated rice seeds containing zinc oxide, bentonite and a surfactant.
[2] A coated rice seed having a coating layer, wherein the coating layer is polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%. Coated rice seeds containing zinc oxide and bentonite, with a surfactant retained at least on the surface.
[3] The rice seed according to claim [1] or [2], wherein the coating layer contains at least one selected from the following group (A).
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate.
[4] The coating layer comprises a first layer containing at least one selected from the group (A) and a second layer containing zinc oxide provided outside the first layer [4]. 3] The rice seeds described in.
[5] A powdery composition containing polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, zinc oxide, and bentonite.
[6] The composition according to [5], which comprises at least one selected from the following group (A).
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate.
[7] The composition according to [5] or [6], which has an average particle size in the range of 0.01 to 150 μm.
[8] The composition according to any one of [5] to [7], which has an apparent specific gravity in the range of 0.30 to 2.0 g / mL.
[9] The composition according to any one of [5] to [8], wherein the average particle size of zinc oxide is in the range of 0.01 to 100 μm.
[10] For producing coated rice seeds containing polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, zinc oxide, bentonite, and a surfactant. Kit.
[11] The kit according to [10], which comprises at least one selected from the following group (A).
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate.
[12] A method for producing coated rice seeds, which comprises the following steps.
(1) While rolling rice seeds, polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, zinc oxide, bentonite, and the following group (A) ), And water is added to form a coating layer containing the polyvinyl alcohol, zinc oxide, bentonite, and at least one selected from the following group (A), (2). ) A step of adding a surfactant while rolling the seeds obtained in the step (1) to hold the surfactant on the outside of the layer formed in the step (1), and (3) the step. A step of drying the seeds obtained in the step (2).
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate.
[13] A method for producing coated rice seeds, which comprises the following steps.
(1) (I) While rolling rice seeds, polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, bentonite, and the following group (A) A step of adding water and at least one selected from the above to form a coating layer containing the polyvinyl alcohol, bentonite, and at least one selected from the following group (A), and (II) the step (II). While rolling the seeds obtained in I), the polyvinyl alcohol, zinc oxide, bentonite, and water were added, and the polyvinyl alcohol was oxidized to the outside of the layer formed in the step (I). A step of forming a coating layer containing zinc and bentonite, (2) a layer formed in the step (1) by adding a surfactant while rolling the seeds obtained in the step (1). A step of retaining the surfactant on the outside of the surface, and (3) a step of drying the seeds obtained in the step (2).
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate.
[14] Coated rice seeds produced by the production method according to [12] or [13].

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

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

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

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

ただし、上記式（１）においてｍ＋ｎが重合度であり、｛ｍ／（ｍ＋ｎ）｝×１００（ｍｏｌ％）がけん化度である。本発明におけるポリビニルアルコールの重合度とは、ＪＩＳ Ｋ６７２６−１９９４に規定されたポリビニルアルコール試験方法に準じて算出することにより求められる平均重合度を意味し、本ＰＶＡの重合度は、好ましくは５００〜３０００、より好ましくは１０００〜２５００、より一層好ましくは１５００〜２５００の範囲である。本発明におけるポリビニルアルコールのけん化度とは、ＪＩＳ Ｋ６７２６−１９９４に規定されたポリビニルアルコール試験方法に準じて算出することにより求められるけん化度を意味し、本ＰＶＡのけん化度は、好ましくは７８．５〜９７．５ｍｏｌ％、より好ましくは８６．５〜９７．５ｍｏｌ％の範囲である。本ＰＶＡは市販されており、市販されている本ＰＶＡとしては、例えば、クラレポバール ＰＶＡ−２２０Ｓ（重合度；２０００、けん化度；８７．０〜８９．０ｍｏｌ％、株式会社クラレ製）、クラレポバール ＰＶＡ−２０５Ｓ（重合度；５００、けん化度；８６．５〜８９．０ｍｏｌ％、株式会社クラレ製）及びゴーセノール ＧＭ−１４Ｓ（重合度；１０００〜１５００、けん化度；８６．５〜８９．０ｍｏｌ％、日本合成化学工業株式会社製）が挙げられる。
本発明においては、粉状のポリビニルアルコールの使用が好ましく、１８０μｍ以上の大きさの粒子が０．５％以下の粒度分布を有するポリビニルアルコールの使用が好ましい。本発明においてポリビニルアルコールの粒度分布とは、ふるい分け法により測定される粒度分布を意味し、１８０μｍ以上の大きさの粒子が０．５％以下の粒度分布を有するとは、目開き１８０μｍのふるい上残量の全体に対する重量比率が０．５％以下であることを示す。ポリビニルアルコールの粒度分布は、目開き１８０μｍのふるい（枠の直径２００ｍｍ、深さ４５ｍｍの日本工業規格（ＪＩＳ）Ｚ８８０１−１に規定される試験用ふるい）上にポリビニルアルコール１０ｇをのせ、ロータップ式振とう機等のふるい分け装置により１０分間ふるった後、ふるい上に残ったポリビニルアルコールの重量を計量し、次式により算出することができる。
ふるい上残量（％）＝ふるい上に残ったポリビニルアルコールの重量（ｇ）／初めにふるいにのせたポリビニルアルコールの重量（ｇ）×１００ In the present invention, the present PVA is a polymer having a structure represented by the following formula (1), the degree of polymerization is 500 or more, and the degree of saponification thereof is in the range of 71.0 to 97.5 mol%. Is.

However, in the above formula (1), m + n is the degree of polymerization, and {m / (m + n)} × 100 (mol%) is the degree of saponification. The degree of polymerization of polyvinyl alcohol in the present invention means the average degree of polymerization obtained by calculating according to the polyvinyl alcohol test method specified in JIS K6726-1994, and the degree of polymerization of the present PVA is preferably 500 to 500. It is in the range of 3000, more preferably 1000 to 2500, and even more preferably 1500 to 2500. The saponification degree of polyvinyl alcohol in the present invention means the saponification degree obtained by calculating according to the polyvinyl alcohol test method specified in JIS K6726-1994, and the saponification degree of the present PVA is preferably 78.5. It is in the range of ~ 97.5 mol%, more preferably 86.5 to 97.5 mol%. This PVA is commercially available, and examples of the commercially available PVA include Kuraray Poval PVA-220S (degree of polymerization; 2000, degree of saponification; 87.0 to 89.0 mol%, manufactured by Kuraray Co., Ltd.) and Kuraray Poval. PVA-205S (degree of polymerization; 500, degree of saponification; 86.5-89.0 mol%, manufactured by Kuraray Co., Ltd.) and Gosenol GM-14S (degree of polymerization; 1000-1500, degree of saponification; 86.5-89.0 mol%) , Made by Nippon Synthetic Chemical Industry Co., Ltd.).
In the present invention, it is preferable to use powdered polyvinyl alcohol, and it is preferable to use polyvinyl alcohol in which particles having a size of 180 μm or more have a particle size distribution of 0.5% or less. In the present invention, the particle size distribution of polyvinyl alcohol means a particle size distribution measured by a sieving method, and particles having a size of 180 μm or more have a particle size distribution of 0.5% or less on a sieve having an opening of 180 μm. It shows that the weight ratio to the total remaining amount is 0.5% or less. The particle size distribution of polyvinyl alcohol is as follows: 10 g of polyvinyl alcohol is placed on a sieve with an opening of 180 μm (a sieve with a frame diameter of 200 mm and a depth of 45 mm specified in Japanese Industrial Standards (JIS) Z8801-1), and a low-tap type shake is performed. After sieving with a sieving device such as a sieve for 10 minutes, the weight of polyvinyl alcohol remaining on the sieving can be weighed and calculated by the following formula.
Remaining amount on the sieve (%) = Weight of polyvinyl alcohol remaining on the sieve (g) / Weight of polyvinyl alcohol placed on the sieve at the beginning (g) x 100

The content of the PVA in the rice seeds is usually in the range of 0.01 to 5% by weight, preferably 0.01 to 3% by weight, and more preferably 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. Examples of commercially available zinc oxide include zinc oxide 3N5 (manufactured by Kanto Chemical Co., Inc.) and two types of zinc oxide (manufactured by Nippon Kagaku Kogyo Co., Ltd.). In the present invention, it is preferable to use zinc oxide having a purity of 99% or more (% by weight based on the zinc oxide). The purity of zinc oxide is determined by the test method specified in Japanese Industrial Standards (JIS) K1410. In addition, powdered zinc oxide is usually used, and the average particle size of the zinc oxide is in the range of 0.01 to 100 μm, preferably 0.1 to 50 μm, and more preferably 0.1 to 10 μm. In the present invention, the average particle size of zinc oxide is a particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and refers to a particle size having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle size of zinc oxide can be determined by a method of measuring by dispersing zinc oxide particles in water using a master sizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. it can.

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

In the present invention, bentonite is a clay containing montmorillonite as a main component, and examples thereof include sodium-type bentonite in which the main cation in the layers of montmorillonite is sodium ion, and calcium-type bentonite in which the cation is calcium ion. These bentonites are commercially available, and examples of commercially available bentonites include bentonite Hotaka (manufactured by Hojun Co., Ltd.) and Kunigel V1 (manufactured by Kunimine Industries, Ltd.). In the present invention, it is preferable to use powdered bentonite, and it is preferable to use bentonite having a particle size distribution of 20% or less of particles having a size of 75 μm or more. In the present invention, the particle size distribution of bentonite means a particle size distribution measured by a sieving method, and particles having a size of 75 μm or more have a particle size distribution of 20% or less means that the remaining amount on the sieve having an opening of 75 μm It shows that the weight ratio to the whole is 20% or less. The particle size distribution of bentonite is a low-tap shaker with 10 g of bentonite placed on a sieve with an opening of 75 μm (a test sieve specified in Japanese Industrial Standards (JIS) Z8801-1 with a frame diameter of 200 mm and a depth of 45 mm). After sieving for 10 minutes with a sieving device such as, the weight of bentonite remaining on the sieving can be weighed and calculated by the following formula.
Remaining amount on the sieve (%) = Weight of bentonite remaining on the sieve (g) / Weight of bentonite placed on the sieve at the beginning (g) x 100

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

As the surfactant in the present invention, at least one selected from the group consisting of nonionic surfactants and anionic surfactants is preferable, and it is composed of polyoxyethylene alkyl ether, polyoxyethylene arylphenyl ether and sulfonate. At least one selected from the group is more preferred. The polyoxyethylene arylphenyl ether is preferably a polyoxyethylene polystyrylphenyl ether, and the sulfonates are naphthalene sulfonate and its formaldehyde condensate, phenol sulfonate and its formaldehyde condensate, and lignin. It is preferably at least one selected from the group consisting of sulfonates.
Examples of the polyoxyethylene alkyl ether include polyoxyethylene stearyl ether and polyoxyethylene tridodecyl ether. Examples of the polyoxyethylene polystyryl phenyl ether include polyoxyethylene tristylyl phenyl ether. Examples of the naphthalene sulfonate and its formaldehyde condensate include a formaldehyde condensate of sodium naphthalene sulfonate, and examples of the phenol sulfonate and its formaldehyde condensate include a formaldehyde condensate of sodium phenol sulfonate. Examples of the lignin sulfonate include sodium lignin sulfonate. These surfactants are commercially available. For example, as a commercially available polyoxyethylene tristyrylphenyl ether, Solpol 5080 (manufactured by Toho Chemical Industry Co., Ltd.) can be mentioned, and formaldehyde of commercially available sodium naphthalene sulfonate is mentioned. Examples of the condensate include New Calgen PS-P (manufactured by Takemoto Oil & Fat Co., Ltd.).
In the present invention, it is preferable to use a powdery surfactant, and it is preferable to use a surfactant in which particles having a size of 100 μm or more have a particle size distribution of 2% or less. In the present invention, the particle size distribution of the surfactant means the particle size distribution measured by the sieving method, and that particles having a size of 100 μm or more have a particle size distribution of 2% or less means that the particles have a mesh size of 100 μm and remain on the sieve. Indicates that the weight ratio to the total amount is 2% or less. For the particle size distribution of the surfactant, place 10 g of the surfactant on a sieve with an opening of 100 μm (a test sieve having a frame diameter of 200 mm and a depth of 45 mm specified in Japanese Industrial Standards (JIS) Z8801-1) and low tap. After sieving for 10 minutes with a sieving device such as a shaker, the weight of the surfactant remaining on the sieve can be weighed and calculated by the following formula.
Remaining amount on the sieve (%) = Weight of the surfactant remaining on the sieve (g) / Weight of the surfactant first placed on the sieve (g) x 100
The content of the surfactant in the rice seeds is usually in the range of 0.002 to 6% by weight, preferably 0.005 to 2% by weight, and more preferably 0.01 to 2% by weight.

The coating layer may contain at least one selected from the group (A) (hereinafter, referred to as the present inorganic compound). Examples of the clay in this inorganic compound include pyrophyllite and kaolin. Further, since the adhesion to rice seeds is good, at least one selected from the group consisting of clay and calcium carbonate is preferable as the present inorganic compound, and calcium carbonate is particularly preferable.
In the present invention, the powdery inorganic compound is preferably used, and its average particle size is usually 200 μm or less, preferably 150 μm or less. In the present invention, the average particle size of the inorganic compound is a particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and refers to a particle size having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle size of the inorganic compound is determined by a method of measuring by dispersing the particles of the inorganic compound in water using a master sizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. be able to.
When two or more kinds of inorganic compounds having different average particle sizes selected from the group (A) are used as the present inorganic compound, the coating layer becomes a denser coating layer. In two or more kinds of inorganic compounds having different average particle diameters, the inorganic compounds may be the same or different.
When the coating layer contains the inorganic compound, its content in the rice seeds is usually in the range of 0.5 to 80% by weight, preferably 1 to 70% by weight, and more preferably 5 to 50% by weight.

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

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

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

In this rice seed, a coating layer containing the present PVA, zinc oxide, bentonite, and a surfactant (hereinafter referred to as the present coating layer 1) is formed on the rice seed, or the present PVA is formed on the rice seed. , A coating layer containing zinc oxide and bentonite (hereinafter referred to as the present coating layer 2) is formed, and then a surfactant is retained on the surface thereof.
The coating layer 1 is formed by adding the PVA, zinc oxide, bentonite, and a surfactant while rolling the rice seeds, and attaching these to the rice seeds. The coating layer 2 is formed by adding the PVA, zinc oxide and bentonite while rolling the rice seeds and adhering them to the rice seeds. As a device for rolling rice seeds, a device used in conventional iron coating such as a coating machine can be used. The PVA, zinc oxide, bentonite and the surfactant can be used separately, or all or at least two kinds of components can be mixed and used. When all the components are mixed and used, a powdery composition containing the present PVA, zinc oxide, bentonite and a surfactant is used. When at least two kinds of components are mixed and used, for example, a powdery composition containing the present PVA, zinc oxide and bentonite and a surfactant are used. When the component α is used, the component α can be used alone, or can be used by adding the component α to the powdery composition containing the present PVA, zinc oxide and bentonite.

After the present coating layer 2 is formed by using the present PVA, zinc oxide and bentonite in a powdery composition (hereinafter referred to as powdery composition Z) and a surfactant, a surfactant is applied to the surface thereof. The method of holding the powder will be described below.
While rolling the rice seeds, the powdery composition Z and water are added to form the present coating layer 2 on the rice seeds. This PVA acts as a binder and can attach zinc oxide and bentonite to rice seeds. The rice seeds preferably have a surfactant retained on at least the surface thereof, and after forming the coating layer 2 on the rice seeds, the surfactant is added while maintaining the rolling state of the rice seeds. Then, by subjecting it to a rolling state, the surfactant adheres to the outside of the present coating layer 2, and the surfactant can be retained on the surface.

When the present inorganic compound is used, in the above method, the present inorganic compound is mixed and added to the powdery composition Z, or the powdery composition containing the present PVA, bentonite and the present inorganic compound (hereinafter, powdery composition). A substance Y) and a powdery composition Z can be prepared, and these can be added separately. When they are added separately, the powdery composition Y is added first, and then the powdery composition Z is added so that the first layer containing the present inorganic compound and the outer side of the first layer are provided. This rice seed having a second layer containing zinc oxide can be obtained. Specifically, while rolling the rice seeds, the powdery composition Y and water are added to form a first layer containing the inorganic compound, the PVA, and bentonite, and then the rolling state of the rice seeds. The powdery composition Z and water are added to form a second layer containing zinc oxide, the present PVA, and bentonite on the outside of the first layer.

The powdery composition containing the present PVA, zinc oxide, and bentonite (hereinafter, may be referred to as the present composition) is suitable as a powdery composition for rice seed coating. The average particle size of the composition is in the range of 0.01 to 150 μm, preferably 1 to 150 μm, and more preferably 5 to 150 μm. In the present invention, the average particle size of the composition is a particle size measured by a laser diffraction / scattering type particle size distribution measuring device, and refers to a particle size having a cumulative frequency of 50% in a volume-based frequency distribution. The average particle size of the present composition is determined by a method of measuring by dispersing the particles of the present composition in water using a master sizer 2000 (manufactured by Malvern) as a laser diffraction / scattering type particle size distribution measuring device. be able to.
The apparent specific gravity of the composition is in the range of 0.30 to 2.0 g / mL, preferably 0.50 to 2.0 g / mL, and more preferably 0.60 to 1.7 g / mL. It is preferable that the apparent specific gravity of the present composition is large because the amount of scattering is small during the production of coated rice seeds. In the present invention, the apparent specific gravity of the composition is determined by a method according to the test method specified in the official pesticide test method (physical test method, Notification No. 71 of the Ministry of Agriculture and Forestry on February 3, 1960). The method is to place an 8-mesh standard sieve (a test sieve specified in Japanese Industrial Standards (JIS) Z8801-1 with a frame diameter of 200 mm and a depth of 45 mm) on a 100 mL metal cylindrical container with an inner diameter of 50 mm. Place the sample in a sieve and lightly scrape it off with a brush to fill the container. Immediately, the excess is scraped off using a slide glass and weighed, the weight of the contents is calculated, and the apparent specific gravity is calculated by the following formula. However, the distance between the sieve and the upper edge of the container is 20 cm.
Apparent specific gravity (g / mL) = weight of contents / 100

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

Some examples of this composition are shown below. In the examples below,% represents% by weight of the composition.
-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 to 97.5 mol%, bentonite, clay, and at least one selected from the group consisting of calcium carbonate. A powdery composition having an average particle size of 0.01 to 150 μm and an apparent specific gravity of 0.30 to 2.0 g / mL.
-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 1000 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, clay, and at least one selected from the group consisting of calcium carbonate. A powdery composition having an average particle size of 1 to 150 μm and an apparent specific gravity of 0.50 to 2.0 g / mL.
-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, clay, and at least one selected from the group consisting of calcium carbonate. A powdery composition having an average particle size of 5 to 150 μm and an apparent specific gravity of 0.60 to 1.7 g / mL.
-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 to 97.5 mol%, bentonite, brazing stone, and at least one selected from the group consisting of calcium carbonate. A powdery composition containing seeds, having an average particle size of 0.01 to 150 μm and an apparent specific gravity of 0.30 to 2.0 g / mL.
-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 1000 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, brazing stone, and at least one selected from the group consisting of calcium carbonate. A powdery composition containing seeds, having an average particle size of 1 to 150 μm and an apparent specific gravity of 0.50 to 2.0 g / mL.
-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, brazing stone, and at least one selected from the group consisting of calcium carbonate. A powdery composition containing seeds, having an average particle size of 5 to 150 μm and an apparent specific gravity of 0.60 to 1.7 g / mL.

-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and calcium carbonate, having an average particle size of 5 to 150 μm. , A powdery composition having an apparent specific gravity of 0.60 to 1.7 g / mL.
-Zinc oxide 0.5 to 60%, polyvinyl alcohol 0.5 to 3% having a degree of polymerization of 1500 to 2500 and a saponification degree in the range of 86.5 to 97.5 mol%, and bentonite 1 to 5 A powdery composition containing% and 32 to 98% calcium carbonate, having an average particle size of 5 to 50 μm and an apparent specific gravity of 0.80 to 1.5 g / mL.
-Zinc oxide 2 to 50%, polyvinyl alcohol 0.5 to 3% having a degree of polymerization of 2000 and a saponification degree in the range of 87.0 to 89.0 mol%, bentonite 1 to 5%, and calcium carbonate. A powdery composition containing 42 to 86.5% calcium, having an average particle size of 15 to 45 μm and an apparent specific gravity of 1.0 to 1.3 g / mL.
-Zinc oxide 48.3%, polyvinyl alcohol 1.0% having a degree of polymerization of 2000 and a saponification degree in the range of 87.0 to 89.0 mol%, bentonite 2.4%, and calcium carbonate 48. A powdery composition consisting of 0.3% and having an average particle size of 16.4 μm.
-Zinc oxide 24.1%, polyvinyl alcohol 1.0% having a degree of polymerization of 2000 and a saponification degree in the range of 87.0 to 89.0 mol%, bentonite 2.4%, and calcium carbonate 72. A powdery composition consisting of 5.5% and having an average particle size of 24.6 μm.
-Zinc oxide 4.8%, polyvinyl alcohol 1.0% having a degree of polymerization of 2000 and a saponification degree in the range of 87.0 to 89.0 mol%, bentonite 2.4%, and calcium carbonate 91. A powdery composition comprising 8.8%, having an average particle size of 42.7 μm and an apparent specific gravity of 1.2 g / mL.

-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and clay, having an average particle size of 5 to 150 μm. A powdery composition having an apparent specific gravity of 0.60 to 1.7 g / mL.
-Zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and brazing stone, and having an average particle size of 5 to 150 μm. , A powdery composition having an apparent specific gravity of 0.60 to 1.7 g / mL.
Zinc oxide 1 to 15%, polyvinyl alcohol 0.5 to 3% having a degree of polymerization of 2000 and a saponification degree in the range of 87.0 to 89.0 mol%, bentonite 1 to 5%, and wax. A powdery composition containing 77 to 97.5% of pyrophyllite, having an average particle size of 1 to 30 μm and an apparent specific gravity of 0.60 to 1.2 g / mL.
-Zinc oxide 9.6%, polyvinyl alcohol 1.0% having a degree of polymerization of 2000 and a saponification degree in the range of 87.0 to 89.0 mol%, bentonite 2.4%, and pyrophyllite 87. %, A powdery composition having an average particle size of 22.5 μm.

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

First, a method for producing coated rice seeds, which comprises a coating layer containing the present PVA, zinc oxide, bentonite, and the present inorganic compound, and a surfactant is retained on the surface thereof (hereinafter referred to as the present production method 1). ) Will be explained. The present manufacturing method 1 has the following steps.
(1) While rolling rice seeds, the present PVA, zinc oxide, bentonite, the present inorganic compound and water are added, and the present PVA, zinc oxide, bentonite and the present inorganic compound are contained. Step of forming a coating layer, (2) While rolling the seeds obtained in the step (1), a surfactant is added, and the surfactant is applied to the outside of the layer formed in the step (1). A step of holding and (3) a step of drying the seeds obtained in the step (2).
In the present production method 1, first, while rolling the soaked rice seeds, a powdery composition containing the PVA, zinc oxide, bentonite, and the inorganic compound (hereinafter referred to as powdery composition X) and water. To form a coating layer containing the present PVA, zinc oxide, bentonite, and the present inorganic compound (hereinafter referred to as step 1) is carried out. In step 1, water may be added, and then the powdery composition X may be added, or the order may be reversed. Moreover, water and powdery composition X may be added at the same time. Both water and powdery composition X are added so as to be applied to the rice seeds in the rolling state. The method of adding water may be either dropping or spraying. After adding water and the powdery composition X, the rolling state of the rice seeds is maintained, and zinc oxide, bentonite, and the present inorganic compound are attached to the rice seeds using the present PVA as a binder.
The total amount of zinc oxide added in the present production method 1 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, and more preferably 0.1 to 50 parts by weight with respect to 100 parts by weight of dried rice seeds. It is in the range of parts by weight. Considering the growth of plants and the influence on the environment, the range of 0.1 to 25 parts by weight is preferable. The total amount of the inorganic compound added is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, and more preferably 1 to 100 parts by weight with respect to 100 parts by weight of dried rice seeds. The total amount of the powdery composition X added is usually in the range of 5 to 500 parts by weight, preferably 5 to 300 parts by weight, and more preferably 10 to 200 parts by weight with respect to 100 parts by weight of the dried rice seeds. The total amount of the PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, and more preferably 0.05 to 4 parts by weight with respect to 100 parts by weight of dried rice seeds. is there. The weight ratio of the PVA to the powdery composition X is usually in the range of 1: 200 to 1:10, preferably 1: 150 to 1:20.

In step 1, the powdery composition X is divided and added, and step 1 is repeated to form a uniform coating layer. In that case, the amount of the powdered composition X added at one time is usually about 1 to 1/10, preferably about 1/2 to 1/5 of the total amount of the powdered composition X added. The total amount of water added is usually 1/2 to 1/100, preferably about 1/3 to 1/10 of the total amount of the powdery composition X added.
In step 1, when the powdery composition X adheres to the inner wall of the apparatus or the like, it can be scraped off with a scraper or the like to attach substantially the entire amount of the added powdery composition X to the rice seeds.

After performing step 1, a step of adding a surfactant while rolling the seeds obtained in step 1 to hold the surfactant on the outside of the layer formed in step 1 (hereinafter referred to as step 2). (Note) is carried out. In step 2, after carrying out step 1, the present PVA, zinc oxide, bentonite, and the present PVA, zinc oxide, bentonite, and the present were added by adding a surfactant and subjecting the rice seeds to the rolling state while maintaining the rolling state. The surfactant can be retained on the outside of the coating layer containing the inorganic compound.

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

Next, a coating layer containing the PVA, zinc oxide, bentonite, and the inorganic compound was provided, and the coating layer was provided on the first layer containing the inorganic compound and outside the first layer. A method for producing coated rice seeds having a second layer containing zinc oxide and having a surfactant retained on the surface thereof (hereinafter referred to as the present production method 2) will be described. The present manufacturing method 2 has the following steps.
(1) (I) While rolling rice seeds, the PVA, bentonite, the inorganic compound, and water are added to form a coating layer containing the PVA, bentonite, and the inorganic compound. Steps and (II) While rolling the seeds obtained in the step (I), the PVA, zinc oxide, bentonite, and water were added to form the layer formed in the step (I). A step of forming a coating layer containing the present PVA, zinc oxide, and bentonite on the outside, (2) while rolling the seeds obtained in the step (1), a surfactant is added, and the step (2) A step of retaining the surfactant on the outside of the layer formed in 1), and (3) a step of drying the seeds obtained in the step (2).
In the present production method 2, first, while rolling the soaked rice seeds, a powdery composition containing the present PVA, bentonite, and the present inorganic compound (hereinafter referred to as powdery composition W) and water are added. Then, a step of forming a coating layer containing the present PVA, bentonite, and the present inorganic compound (hereinafter referred to as step I) is carried out. Step I can be carried out in the same manner as in step 1 of the present production method 1 except that the powdery composition W is used instead of the powdery composition X. After performing step I, while rolling the seeds obtained in step I, a powdery composition containing the present PVA, zinc oxide and bentonite (hereinafter referred to as powdery composition V) and water are added. Then, a step of forming a coating layer containing the present PVA, zinc oxide, and bentonite on the outside of the layer formed in step I (hereinafter referred to as step II) is carried out. Step II can be carried out in the same manner as in Step I, except that the powdery composition V is used instead of the powdery composition W.
The total amount of zinc oxide added in the present production method 2 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, based on 100 parts by weight of dried rice seeds. It is in the range of parts by weight. Considering the growth of plants and the influence on the environment, the range of 0.1 to 25 parts by weight is preferable. The total amount of the inorganic compound added is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, and more preferably 1 to 100 parts by weight with respect to 100 parts by weight of dried rice seeds. The total amount of the powdery composition V added is usually in the range of 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, and more preferably 1 to 60 parts by weight with respect to 100 parts by weight of dried rice seeds. .. The total amount of the powdery composition W added is usually in the range of 5 to 250 parts by weight, preferably 5 to 200 parts by weight, and more preferably 5 to 150 parts by weight with respect to 100 parts by weight of the dried rice seeds. The total amount of the PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, and more preferably 0.05 to 4 parts by weight with respect to 100 parts by weight of dried rice seeds. is there. The weight ratio of the present PVA to the powdery composition V 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 powdery 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 steps 2 and subsequent steps of the present manufacturing method 1 may be carried out in the same manner.

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

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

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

In the following production examples and comparative production examples, unless otherwise specified, rice seeds were Hinohikari seeds, and production was carried out at room temperature (about 20 ° C.). Further,% represents weight%.
The product names described in the production example and the comparative production example are as follows.
LPZINC-20: Zinc oxide, manufactured by Sakai Chemical Industry Co., Ltd., average particle size; 27.4 μm
Zinc oxide 3N5: Zinc oxide, manufactured by Kanto Chemical Co., Inc., average particle size; 7.7 μm
Two types of zinc oxide: zinc oxide, manufactured by Nippon Chemical Industrial Co., Ltd., average particle size; 0.24 μm
Calcium carbonate G-100: Calcium carbonate, manufactured by Sankyo Seiko Co., Ltd., average particle size; 46.0 μm
For tankal granules: calcium carbonate, manufactured by Yakusen Lime Co., Ltd., average particle size; 6.2 μm
DL for clay powder: Rouseki, manufactured by Katsumitsuyama Mining Co., Ltd., average particle size: 30.3 μm
Rutile flower: Titanium oxide, manufactured by Kinsei Matek Co., Ltd., average particle size; 14.6 μm
Sun Zeolite MGF: Zeolite, Sun Zeolite Industry Co., Ltd., Average Particle Size; 11
6 μm
Katsumitsuyama Clay S: Row stone, Bent Night Hotaka manufactured by Katsumitsuyama Mining Co., Ltd .: Montmorillonite, DAE1K manufactured by Hojun Co., Ltd .: Iron powder, KTS-1 manufactured by DOWA IP Creation Co., Ltd. 220S: Polyvinyl alcohol, Degree of saponification: 87.0-89.0 mol%, Degree of polymerization 2000, Gosenol GM-14S manufactured by Kuraray Co., Ltd .: Polyvinyl alcohol, Degree of saponification: 86.5-89.0 mol%, Degree of polymerization 1000-1500 , Nippon Synthetic Chemical Industry Co., Ltd. Clarepoval PVA-205S: Polyvinyl alcohol, Degree of saponification: 86.5-89.0 mol%, Degree of polymerization 500, Clarepoval Co., Ltd. PVA-224S: Polyvinyl alcohol, Degree of saponification : 87.0 to 89.0 mol%, degree of polymerization 2400, Solpol 5080 manufactured by Kuraray Co., Ltd .: Polyoxyethylene tristyrylphenyl ether, manufactured by Toho Chemical Industry Co., Ltd.

Manufacturing example 1
First, a simple seed coating machine capable of coating when the amount of rice seeds used was small was prepared. As shown in FIG. 1, a polyethylene cup 2 having a capacity of 500 mL is attached to the tip of the shaft 1, and it is inserted into the drive shaft of a stirrer 3 (Three One Motor, manufactured by Shinto Kagaku) so that the elevation angle is 45 degrees. A simple seed coating machine was produced by attaching the stirrer 3 to the stand 4 at an angle.
Next, 2 g of two zinc oxides, 0.2 g of Gosenol GM-14S and 0.25 g of bentonite spike height were mixed to obtain a powdery composition (1). About 100 mL of water was put into a polyethylene cup having a capacity of 200 mL, 20 g of dried rice seeds was put into the cup, and the seeds were soaked for 10 minutes. Then, the rice seeds were taken out from the water, excess water on the surface was removed, and then the rice seeds were put into a polyethylene cup 2 attached to the prepared simple seed coating machine. The rice seeds are rolled by operating the simple seed coating machine in the range of rotation speed of 130 to 140 rpm of the stirrer 3, and water is sprayed on the rice seeds by spraying 1 / 2.45 g of the powdery composition (1). About 4 amounts (about 0.6 g) were added and attached to rice seeds. When the powdery composition (1) adhered to the inner wall of the polyethylene cup 2, it was scraped off with a spatula to attach substantially the entire amount of the powdery composition (1) added at one time to the rice seeds. .. Then, by repeating the same operation three times, 2.45 g of the powdery composition (1) was adhered to the rice seeds to form a coating layer. The total amount of water used for coating was 2.4 g. Next, the simple seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 0.1 g of Solpol 5080 was added and adhered to the outside of the coating layer. The rice seeds taken out from the simple seed coating machine were spread on a stainless steel vat so as not to overlap with each other, and dried overnight to obtain the coated rice seeds (1) of the present invention.

Manufacturing example 2
2 g of zinc oxide, 0.1 g of Kuraray Povar PVA-205S and 0.25 g of bentonite spike height were mixed to obtain a powdery composition (2).
The following operation was performed according to the method described in Production Example 1. Using 2.35 g of the above powdered composition (2) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (2) in four portions, and then on the outside thereof. The coated rice seed (2) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 0.5 g.

Manufacturing example 3
10 g of LPZINC-20, 0.1 g of Kuraray Povar PVA-224S and 0.25 g of bentonite spike height were mixed to obtain a powdery composition (3).
The following operation was performed according to the method described in Production Example 1. Using 10.35 g of the above powdered composition (3) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (3) in four portions, and then on the outside thereof. The coated rice seed (3) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 1.4 g.

Manufacturing example 4
A powdery composition (4) was obtained by mixing 5 g of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of Kuraray Povar PVA-220S, and 0.25 g of bentonite spike height. The average particle size of the powdery composition (4) was 16.4 μm.
The following operation was performed according to the method described in Production Example 1. Using 10.35 g of the above powdered composition (4) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (4) in four portions, and then on the outside thereof. The coated rice seed (4) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 2.8 g.

Production example 5
10 g of zinc oxide 3N5, 10 g for tankal granules, 0.2 g of Kuraray Povar PVA-220S and 0.5 g of bentonite spike height were mixed to obtain a powdery composition (5). The average particle size of the powdery composition (5) was 8.2 μm.
The following operation was performed according to the method described in Production Example 1. Using 20.7 g of the above powdered composition (5) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (5) in four portions, and then on the outside thereof. The coated rice seed (5) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 5.6 g.

Production example 6
20 g of zinc oxide 3N5, 20 g of tankal granules, 0.4 g of Kuraray Povar PVA-220S and 1.0 g of bentonite spike height were mixed to obtain a powdery composition (6). The average particle size of the powdery composition (6) was 8.2 μm.
The following operation was performed according to the method described in Production Example 1. Instead of 2.45 g of the powdery composition (1), 41.4 g of the above powdery composition (6) was used, and the coating layer was formed by adding the powdery composition (6) in four portions, and then on the outside thereof. The coated rice seed (6) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 10.3 g.

Production example 7
1 g of zinc oxide 3N5, 9 g of rutile flower, 0.1 g of Kuraray Povar PVA-220S and 0.25 g of bentonite spike height were mixed to obtain a powdery composition (7). The average particle size of the powdery composition (7) was 15.1 μm.
The following operation was performed according to the method described in Production Example 1. Using 10.35 g of the above powdered composition (7) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (7) in four portions, and then on the outside thereof. The coated rice seed (7) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 1.4 g.

Production Example 8
A powdery composition (8) was obtained by mixing 1 g of zinc oxide 3N5, 9 g of sun zeolite MGF, 0.1 g of Kuraray Povar PVA-220S, and 0.25 g of bentonite spike height. The average particle size of the powdery composition (8) was 131.1 μm.
The following operation was performed according to the method described in Production Example 1. Using 10.35 g of the above powdered composition (8) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (8) in four portions, and then on the outside thereof. The coated rice seed (8) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 4.2 g.

Manufacturing example 9
A powdery composition (9) was obtained by mixing 1 g of zinc oxide 3N5, 9 g of DL for clay powder, 0.1 g of Kuraray Povar PVA-220S, and 0.25 g of bentonite spike height. The average particle size of the powdery composition (9) was 22.5 μm.
The following operation was performed according to the method described in Production Example 1. Using 10.35 g of the above powdered composition (9) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (9) in four portions, and then on the outside thereof. The coated rice seed (9) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 2.4 g.

Production Example 10
The powdery composition (10) was obtained by mixing 0.1 g of two zinc oxides, 9.9 g of calcium carbonate G-100, 0.1 g of Kuraray Povar PVA-220S and 0.25 g of bentonite spike height. The powdery composition (10) had an average particle size of 44.5 μm and an apparent specific gravity of 1.2 g / mL.
The following operation was performed according to the method described in Production Example 1. Using 10.35 g of the above powdered composition (10) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (10) in four portions, and then on the outside thereof. The coated rice seed (10) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 2.3 g.

Production Example 11
70.0 parts by weight (E) -1- (2-chloro-1,3-thiazole-5-ylmethyl) -3-methyl-2-nitroguanidine (generic name: clothianidin) and 30.0 parts by weight win Mitsuyama clay S was mixed and then pulverized with a centrifugal pulverizer to obtain powdered pesticide A. The particle size of the powdered pesticide A determined by wet measurement using Mastersizer 2000 (manufactured by Malvern) was 13.0 μm.
A powdery composition (11) was obtained by mixing 5 g of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of Kuraray Povar PVA-220S, 0.25 g of bentonite spike height and 0.086 g of powdered pesticide A.
The following operation was performed according to the method described in Production Example 1. Using 10.436 g of the above powdered composition (11) instead of 2.45 g of the powdered composition (1), the coating layer was formed by adding the powdery composition (11) in four portions, and then on the outside thereof. The coated rice seed (11) of the present invention was obtained by attaching 0.1 g of Solpol 5080. The total amount of water used for coating was 3.9 g.

Production Example 12
A powdery composition (12) was obtained by mixing 5 g of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of Kuraray Povar PVA-220S, 0.25 g of bentonite spike height and 0.01 g of Solpol 5080.
The following operation was performed according to the method described in Production Example 1. The present invention is formed by using 10.36 g of the above powdered composition (12) in place of 2.45 g of the powdered composition (1) and adding the powdery composition (12) in four portions to form a coating layer. Coated rice seeds (12) were obtained. The total amount of water used for coating was 2.3 g.

Production Example 13
A powdery composition (13-1) was obtained by mixing 5 g of rutile flower, 0.1 g of Kuraray Povar PVA-224S and 0.15 g of bentonite spike height.
Further, 5 g of zinc oxide 3N, 0.1 g of Kuraray Povar PVA-224S and 0.15 g of bentonite spike height were mixed to obtain a powdery composition (13-2).
The following operation was performed according to the method described in Production Example 1. After soaking 20 g of dried rice seeds, it is rolled using a simple seed coating machine, and while spraying water on the rice seeds by spraying, the amount is about 1/4 of 5.25 g of the powdery composition (13-1). (About 1.3 g) was added and attached to rice seeds. When the powdery composition (13-1) adheres to the inner wall of the polyethylene cup 2, it is scraped off with a spatula so that substantially the entire amount of the powdery composition (13-1) added at one time is rice seeds. Was attached to. After that, by repeating the same operation three times, 5.25 g of the powdery composition (13-1) was attached to the rice seeds to form a first coating layer containing rutile flowers (hereinafter referred to as the first layer). It was formed. The total amount of water used for coating was 1.3 g.
Next, the simple seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and while spraying water on the rice seeds by spraying, 1/4 of 5.25 g of the powdery composition (13-2). A moderate amount (about 1.3 g) was added and adhered to the outside of the first layer. When the powdery composition (13-2) adheres to the inner wall of the polyethylene cup 2, it is scraped off with a spatula so that substantially the entire amount of the powdery composition (13-2) added at one time is rice seeds. Was attached to. Then, by repeating the same operation three times, 5.25 g of the powdery composition (13-2) was adhered to the outside of the first layer, and the outside of the first layer was coated with a second coating containing zinc oxide. A layer (hereinafter referred to as a second layer) was formed. The total amount of water used for coating was 2.9 g.
Next, the simple seed coating machine was kept in operation to maintain the rolling state of the rice seeds, and 0.1 g of Solpol 5080 was added and adhered to the outside of the second layer. The rice seeds taken out from the simple seed coating machine were spread on a stainless steel vat so as not to overlap with each other, and dried overnight to obtain the coated rice seeds (13) of the present invention.

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

Next, a test example is shown.

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

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

Test Example 3
Ten coated rice seeds were put into a petri dish containing 50 mL of 3 degree hard water 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.

1 Shaft 2 Polyethylene cup 3 Stirrer 4 Stand

Claims (10)

A coated rice seed having a coating layer, wherein the coating layer contains polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, and zinc oxide. , Bentnite, at least one selected from the following group (A), and a surfactant, wherein the content of the surfactant in the coated rice seed is in the range of 0.005 to 2% by weight. der is, the weight ratio of the at least one selected from zinc oxide and the following group (a) is 1: 200 to 1: in the range of 3, the coating rice seeds.
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate. A coated rice seed having a coating layer, wherein the coating layer contains polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, and zinc oxide. , Bentnite and at least one selected from the following group (A) , which is a coated rice seed in which a surfactant is retained at least on the surface, and the content of the surfactant in the coated rice seed is 0. 005-2 wt% range der is, the weight ratio of the at least one selected from zinc oxide and the following group (a) is 1: 200 to 1: in the range of 3, the coating rice seeds.
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate. Claim 1 or claim 1 , wherein the coating layer includes a first layer containing at least one selected from the group (A) and a second layer containing zinc oxide provided outside the first layer. The rice seed according to 2 . A powder containing polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, zinc oxide, bentonite, and at least one selected from the following group (A). A powdery composition having a weight ratio of zinc oxide to at least one selected from the following group (A) in the range of 1: 200 to 1: 3.
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate. The composition according to claim 4 , wherein the average particle size is in the range of 0.01 to 150 μm. The composition according to claim 4 or 5 , wherein the apparent specific gravity is in the range of 0.30 to 2.0 g / mL. The composition according to any one of claims 4 to 6 , wherein the average particle size of zinc oxide is in the range of 0.01 to 100 μm. Polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, zinc oxide, bentonite, at least one selected from the following group (A), and surface activity. A kit for producing coated rice seeds containing an agent, wherein the weight ratio of zinc oxide to at least one selected from the following group (A) is in the range of 1: 200 to 1: 3. Kit for manufacturing.
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate. A method of manufacturing a coated rice seeds having the following steps, Ri range der content of 0.005% by weight of a surfactant in the coating rice seeds, selected from zinc oxide and the following group (A) A method for producing coated rice seeds, wherein the weight ratio with at least one species is in the range of 1: 200 to 1: 3 .
(1) While rolling rice seeds, polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, zinc oxide, bentonite, and the following group (A) ), And water is added to form a coating layer containing the polyvinyl alcohol, zinc oxide, bentonite, and at least one selected from the following group (A), (2). ) A step of adding a surfactant while rolling the seeds obtained in the step (1) to hold the surfactant on the outside of the layer formed in the step (1), and (3) the step. A step of drying the seeds obtained in the step (2).
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate. A method of manufacturing a coated rice seeds having the following steps, Ri range der content of 0.005% by weight of a surfactant in the coating rice seeds, selected from zinc oxide and the following group (A) A method for producing coated rice seeds, wherein the weight ratio with at least one species is in the range of 1: 200 to 1: 3 .
(1) (I) While rolling rice seeds, polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%, bentonite, and the following group (A) A step of adding water and at least one selected from the above to form a coating layer containing the polyvinyl alcohol, bentonite, and at least one selected from the following group (A), and (II) the step (II). While rolling the seeds obtained in I), the polyvinyl alcohol, zinc oxide, bentonite, and water were added, and the polyvinyl alcohol was oxidized to the outside of the layer formed in the step (I). A step of forming a coating layer containing zinc and bentonite, (2) a layer formed in the step (1) by adding a surfactant while rolling the seeds obtained in the step (1). A step of retaining the surfactant on the outside of the surface, and (3) a step of drying the seeds obtained in the step (2).
Group (A): A group consisting of titanium oxide, clay, zeolite and calcium carbonate.

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