KR102647453B1 - Coated rice seeds and method for producing the same - Google Patents

Abstract

A coated rice seed having a coating layer, wherein the coating layer contains alpha starch having a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C, and zinc oxide.

Description

Coated rice seeds and method for producing the same

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

Direct seeding of rice is a cultivation method in which rice seeds are sown directly in the rice field, and has the advantage of increasing the power of agricultural work because seedling or transplanting work is not necessary. On the other hand, the above method also has the drawback of being easily susceptible to delirium tremens by birds such as ducks and sparrows. Since a decrease in the seedling rate due to delirium tremens leads to a decrease in income, measures to avoid delirium tremens have been desired. As a conventional deliquescence avoidance measure, for example, a method of preventing deliquescence through water management has been proposed. However, it is necessary to change the management method depending on the type of bird (see, for example, Non-Patent Document 1).

In addition, iron-coated freshwater direct seeding is known as a technology that coats rice seeds with iron to suppress floating of the seeds when sowing on the soil surface and prevent them from being eaten by sparrows (see, for example, Non-Patent Document 2) ). However, since that technology utilizes the solidification of iron through oxidation, the management of coated rice seeds is cumbersome, as it is necessary to dissipate the heat generated during oxidation, and if the management of coated rice seeds is insufficient, the germination rate is reduced. There was a problem with this deteriorating. As a solution to this problem, a technique for coating rice seeds using a coating material such as polyvinyl alcohol and iron oxide with a high degree of saponification is known (see Patent Document 1).

Patent Document 1: Japanese Patent Publication No. 2013-146266

Non-patent Document 1: Nagao Sakai and 3 others, “Measures to prevent seed damage in freshwater direct seeding cultivation of rice,” The Hokuriku Crop Science, Japan Crop Science Society, March 31, 1999, Volume 34. , p. 59-61 Non-patent Document 2: Minoru Yamauchi, “Iron Coated Freshwater Direct Seeding Manual 2010”, Independent Administrative Corporation Agricultural and Food Industrial Technology Comprehensive Research Organization, Kinki China Western Agricultural Research Center, March 2010

However, the deliquescence prevention effect of rice seeds coated with iron oxide was not sufficient.

The object of the present invention is to provide coated rice seeds that are less susceptible to deliquescence and in which seed floating and a decrease in germination rate are suppressed.

The present inventors studied to solve this problem and found that rice seeds were coated with alpha starch and zinc oxide in a 2% aqueous suspension with a swelling degree in the range of 10 to 48 mL/g at 20°C. It was found that when sowing, deliquescence is reduced and a sufficient seedling rate can be secured in direct sowing of paddy rice.

The present invention is as follows.

[One]

A coated rice seed having a coating layer, wherein the coating layer contains alpha starch having a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C, and zinc oxide.

[2]

The coated rice seed according to [1], wherein the coating layer contains at least one compound selected from the following group (A);

Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate.

[3]

The coated rice according to [2], wherein the coating layer has a first layer containing at least one compound selected from the group (A), and a second layer containing zinc oxide formed on the outside of the first layer. satellite.

[4]

The coated rice seed according to [1] or [2], wherein the coating layer further contains iron oxide.

[5]

The coated rice seed described in [4], wherein the coating layer has a first layer containing iron oxide and a second layer containing zinc oxide formed on the outside of the first layer.

[6]

A powdery composition comprising alpha starch having a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C, and zinc oxide.

[7]

The powder composition according to [6], comprising at least one compound selected from the following group (A);

Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate.

[8]

The powder composition according to [6] or [7], wherein the average particle size is in the range of 0.01 to 150 μm.

[9]

The powder composition according to any one of [6] to [8], wherein the apparent relative density is in the range of 0.30 to 2.50 g/mL.

[10]

The powder composition according to any one of [6] to [8], wherein the apparent relative density is in the range of 0.30 to 2.0 g/mL.

[11]

The powder composition according to any one of [6] to [10], further containing iron oxide.

[12]

The powder composition according to any one of [6] to [11], wherein the average particle size of the zinc oxide is in the range of 0.01 to 100 μm.

[13]

A kit for producing coated rice seeds, comprising alpha starch in a 2% aqueous suspension having a swelling degree in the range of 10 to 48 mL/g at 20°C, and zinc oxide.

[14]

The kit described in [13] further comprising iron oxide.

[15]

The kit according to [13] or [14], further comprising at least one compound selected from the following group (A);

Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate.

[16]

Method for producing coated rice seeds comprising the following steps:

(1) While rolling rice seeds, a 2% aqueous suspension of alpha starch having a swelling degree at 20°C of 10 to 48 mL/g, zinc oxide, and at least one selected from the following group (A) Adding a compound and water to form a coating layer containing the alpha starch, zinc oxide, and at least one compound selected from the following group (A), and

(2) drying the seeds obtained in step (1);

Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate.

[17]

Method for producing coated rice seeds comprising the following steps:

(1) (I) Alpha starch having a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C while rolling rice seeds, and at least one compound selected from the following group (A) and adding water to form a coating layer containing the alpha starch and at least one compound selected from the group (A) below, and (II) rolling the seeds obtained in step (I), Adding the alpha starch, zinc oxide, and water to form a coating layer containing the alpha starch and zinc oxide on the outside of the layer formed in step (I), and

(2) drying the seeds obtained in step (1);

Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate.

[18]

Coated rice seeds produced by the production method described in [16] or [17].

[19]

Method for producing coated rice seeds comprising the following steps:

(1) While rolling the rice seeds, alpha starch having a swelling degree of 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C, zinc oxide, iron oxide, and water are added, and the alpha starch forming a coating layer comprising zinc oxide and iron oxide, and

(2) Drying the seeds obtained in step (1).

[20]

Method for producing coated rice seeds comprising the following steps:

(1) (I) While rolling the rice seeds, alpha starch having a swelling degree of 2% water suspension at 20°C in the range of 10 to 48 mL/g, iron oxide, and water are added, and the alpha starch and water are added. , forming a coating layer containing iron oxide, and (II) adding the alpha starch, zinc oxide, and water while rolling the seed obtained in step (I), thereby forming a layer formed in step (I). forming a coating layer containing the alpha starch and zinc oxide on the outside of the

(2) Drying the seeds obtained in step (1).

[21]

Coated rice seeds produced by the production method described in [19] or [20].

The coated rice seeds of the present invention are less susceptible to deliquescence, and furthermore, seed floating and decline in germination rate are suppressed, and a sufficient seedling rate can be secured in direct seeding cultivation of paddy rice.

[Figure 1] This is an explanatory diagram to explain the simple seed coating machine used to coat rice seeds in the example.

Form for carrying out the invention

The coated rice seed of the present invention (hereinafter referred to as “this rice seed”) has a coating layer, and the coating layer is an alpha starch having a swelling degree of a 2% aqueous suspension at 20° C. in the range of 10 to 48 mL/g. (hereinafter referred to as “bon alpha starch”) and zinc oxide.

In the present invention, rice seeds refer to seeds of varieties commonly cultivated as rice.

The varieties include japonica species and indica species, and varieties with high lodging tolerance and germination rate are preferable.

In the present invention, alpha starch is also called gelatinized starch (or starch in a gelatinized state) and means starch with a degree of gelatinization of 90% or more. The degree of gelatinization of alpha starch in the present invention is determined by an analysis method in accordance with the Customs Central Analysis Laboratory Act No. 51. The analysis method in accordance with the Customs Central Analysis Laboratory Act No. 51 is as follows.

1. Preparation of reagents

Phosphate-citric acid buffer solution (pH = 4.0-5.0)

Add 15 mL of 1 M phosphoric acid and 17 mL of 0.1 M citric acid to 1.5 mL of 10 M aqueous sodium hydroxide solution and adjust pH to 4.0-5.0.

Glucoamylase solution

Glucoamylase (manufactured by Huaguang Pure Medicine Industry Co., Ltd.) is dissolved in deionized water and the titer is adjusted to about 15 units per mL.

Protein A solution

ZnSO ₄ ·7H ₂ O aqueous solution (1.8 % (W/V))

protein B solution

Ba(OH) ₂ ·8H ₂ O aqueous solution (2.0 % (W/V))

Glycerin standard solution

Dissolve 1.0 g of glycerin in deionized water to make a constant volume of 25 mL.

2. Preparation of test solution

Prepare a uniform suspension (1.25 g of starch sample / 100 mL deionized water), add 4.0 mL of the suspension to two 50 mL Erlenmeyer flasks, and add 3.35 mL of phosphoric acid-citric acid buffer solution to one flask, making it “Liquid I.” makes In another flask, add 0.15 mL of 10 M aqueous sodium hydroxide solution, heat to 37°C for 30 minutes to completely swell and disintegrate the starch particles, then add 1.5 mL of 1 M phosphoric acid and 1.7 mL of 0.1 M citric acid, and add "II" It creates a “liquid”. After placing the two solutions in a thermostat at 37°C and stabilizing the temperature, 2.0 mL of glucoamylase solution is added to each solution, and while shaking, the starch in each solution is allowed to react with glucoamylase for 120 minutes. Afterwards, the enzymes in each solution are inactivated, and 5.0 mL of protein A solution, 5.0 mL of protein B solution, and 1.0 mL of glycerin standard solution are added to each solution. The obtained solutions were transferred to 50 mL centrifuge tubes and centrifuged at 4000 rpm for 5 minutes. The supernatant is passed through a membrane filter (0.45 μm), and the obtained solution is used as a test solution for glucose determination (hereinafter referred to as “Ia solution” and “IIa solution”).

3. Quantification of glucose

The glucose weight of each of liquid Ia and liquid IIa is quantified using Glucose CII-Test Wako (manufactured by Huaguang Pure Chemical Industry Co., Ltd.).

4. Calculation of alpha degree

The degree of gelatinization is calculated as the ratio of the glucose weight (g) of the Ia liquid based on the glucose weight (g) of the IIa liquid as the following formula.

Degree of gelatinization (%) = Glucose weight of Ia liquid (g) / Glucose weight of IIa liquid (g) × 100

This alpha starch is commercially available, and examples of commercially available alpha starches include Amilox No. 1A (manufactured by Nippon Corn Starch Co., Ltd.) and Corn Alpha Y (manufactured by Sanwa Starch Industry Co., Ltd.).

As the alpha starch, powdered alpha starch is preferable, and its particle size is usually 1000 μm or less, preferably 800 μm or less. In the present invention, the particle size of alpha starch is the particle size measured with a laser diffraction/scattering type particle size distribution measuring device, and refers to the particle size at which the cumulative frequency is 100% in the volume-based frequency distribution. The particle size of alpha starch can be determined by the so-called dry measurement method, which is a method of dispersing alpha starch particles in the air and measuring them using a laser diffraction/scattering type particle size distribution measuring device, MASTERSIZER2000 (manufactured by MALVERN).

The swelling degree of this alpha starch is the swelling degree measured by the volumetric method. The swelling degree at 20°C of a 2% water suspension is the swelling degree of alpha starch determined from a suspension in which 2% alpha starch is suspended in water at 20°C. The specific measurement method of swelling degree is described below. First, add 2.0 g of sample little by little to a 200 mL beaker containing 100 mL of ion-exchanged water, add the entire amount, and stir at room temperature for 5 minutes. Afterwards, transfer the resulting liquid to a 100 mL graduated measuring cylinder, cap it, leave it in a constant temperature water bath at 20°C for 24 hours, read the apparent volume of the sample swollen in the cylinder, and calculate the swelling degree (mL/g). do. The swelling degree of this alpha starch is in the range of 10 to 48 mL/g, preferably 12 to 46 mL/g.

The content of alpha starch in this rice seed is usually in the range of 0.01 to 15% by weight, preferably 0.01 to 10% by weight, and more preferably 0.1 to 5% 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., Ltd.) and zinc oxide heterogeneous (manufactured by Japan Chemical Industry Co., Ltd.). In the present invention, it is preferable to use zinc oxide with a purity of 99% or more (% by weight relative to zinc oxide). The purity of zinc oxide is determined by the test method specified in Japanese Industrial Standards (JIS) K1410. Additionally, 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 the particle size measured with a laser diffraction/scattering type particle size distribution measuring device, and refers to the particle size that is 50% of the cumulative frequency in the volume-based frequency distribution. The average particle size of zinc oxide can be determined by dispersing zinc oxide particles in water and measuring them using a laser diffraction/scattering type particle size distribution measuring device, MASTERSIZER 2000 (manufactured by Malvern), the so-called wet measurement method.

The zinc oxide content in this rice seed is usually in the range of 0.005 to 80% by weight, preferably 0.01 to 70% by weight, and more preferably 0.02 to 50% by weight. Considering the impact on plant growth and the environment, a range of 0.02 to 15% by weight is preferable.

The coating layer may contain at least one compound selected from the group (A) (hereinafter referred to as “this inorganic compound”). Examples of clay in this inorganic compound include foliar stone and kaolin. Moreover, since it has good adhesion to rice seeds, at least one compound selected from the group consisting of clay and calcium carbonate is preferable as the present inorganic compound, and calcium carbonate is especially preferable.

In the present invention, it is preferable to use the present inorganic compound in powder form, and its average particle diameter is usually 200 μm or less, preferably 150 μm or less. In the present invention, the average particle size of the present inorganic compound is the particle size measured with a laser diffraction/scattering type particle size distribution measuring device, and refers to the particle size at which the cumulative frequency is 50% in the volume-based frequency distribution. The average particle diameter of the present inorganic compound can be determined by dispersing particles of the present inorganic compound in water using a laser diffraction/scattering type particle size distribution measuring device, MASTERSIZER 2000 (manufactured by Malvern), and measuring the particle size, the so-called wet measurement method.

When two or more inorganic compounds selected from the above group (A) with different average particle sizes are used as the present inorganic compound, the coating layer becomes a more dense coating layer. In two or more types of inorganic compounds having different average particle diameters, the inorganic compounds may be the same or different.

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

The coating layer may contain pesticide active ingredients. Examples of such pesticide active ingredients include insecticidal active ingredients, bactericidal active ingredients, herbicidal active ingredients, and plant growth regulator active ingredients.

Examples of such insecticidal active ingredients include clothianidin, imidacloprid, and thiamethoxam.

Examples of such bactericidal active ingredients include isotianil and furametpyr.

Examples of such herbicidal active ingredients include imazosulfuron and bromobutide.

Examples of such plant growth regulating active ingredients include uniconazole P.

In the present invention, it is preferable to use a powdered pesticide active ingredient, and if necessary, it can be mixed with the present inorganic compound and pulverized using a grinder such as a dry grinder to obtain a powder pesticide. The average particle size of the powdered pesticide is usually 200 μm or less, preferably 150 μm or less. In the present invention, the average particle size of the powdered pesticide is the particle size measured with a laser diffraction/scattering type particle size distribution measuring device, and refers to the particle size that is 50% of the cumulative frequency in the volume-based frequency distribution. In addition, when the powder pesticide is a mixture with the present inorganic compound, the average particle diameter of the powder pesticide means the average particle diameter of the mixture. The average particle size of the powdered pesticide can be determined by dispersing the powdered pesticide particles in water and measuring them using a laser diffraction/scattering type particle size distribution measuring device, MASTERSIZER 2000 (manufactured by Malvern), the so-called wet measurement method.

When the coating layer contains a pesticide active ingredient, its content in the rice seed is usually in the range of 0.001 to 3% by weight, preferably 0.005 to 2% by weight, more preferably 0.01 to 2% by weight.

The coating layer may contain a colorant. Examples of such colorants include pigments, pigments, and dyes, and the use of pigments is particularly preferable. As such a pigment, it is preferable to use a red or blue pigment, and examples include ultramarine blue Nubix G-58 (blue pigment, manufactured by Nubiola) and Toda Color-300R (red pigment, manufactured by Toda Industry Co., Ltd.). .

These components used to produce this rice seed can be used separately, or all or at least two types of components can be mixed. The kit of the present invention (hereinafter referred to as “this kit”) contains alpha starch and zinc oxide, and these may be placed in one container or may be placed in two or more containers. That is, this kit may contain one or more containers. When this kit contains two or more containers, each container may contain different ingredients. Additionally, this kit may contain other components (hereinafter referred to as “component α”) such as iron oxide, this inorganic compound, and pesticide active ingredient.

This rice seed can be obtained by forming a coating layer (hereinafter referred to as “this coating layer 1”) containing this alpha starch, zinc oxide, and optionally additionally used iron oxide or this inorganic compound on the rice seed. .

The present coating layer 1 is formed by adding the present alpha starch, zinc oxide, optionally used iron oxide or the present inorganic compound while rolling the rice seeds, and allowing them to adhere to the rice seeds. As a device for transmitting rice seeds, a device used in conventional iron coating, such as a coating machine, can be used. The alpha starch, zinc oxide, iron oxide or the inorganic compound optionally used may be used separately, or may be used in whole or in a mixture of at least two components. When using a mixture of this alpha starch, zinc oxide, optionally additionally used iron oxide, or this inorganic compound, a powder composition containing this alpha starch, zinc oxide, optionally additionally used iron oxide or this inorganic compound is used. do. In addition, when using component α, component α may be used alone, or component α may be added to a powdery composition containing alpha starch and zinc oxide.

A method for forming the present coating layer 1 using the powder composition containing the present alpha starch and zinc oxide (hereinafter referred to as “powder composition Z”) will be described below.

While rolling the rice seeds, powder composition Z and water are added to form the main coating layer 1 on the rice seeds. This alpha starch acts as a binder and can cause zinc oxide to attach to rice seeds.

When using the present inorganic compound, in the above method, the present inorganic compound is mixed and added to the powder composition Z, or a powder composition containing the present alpha starch and the present inorganic compound (hereinafter referred to as “powder composition Y”) You can prepare a powder composition Z and add them separately. When adding separately, first the powder composition Y is added, and then the powder composition Z is added, thereby forming a first layer containing the present inorganic compound and a second layer containing zinc oxide formed on the outside of the first layer. You can obtain this rice seed having . Specifically, while rolling the rice seeds, powdered composition Y and water are added to form a first layer containing the present inorganic compound and this alpha starch, and then, while maintaining the rolling state of the rice seeds, powdered composition Z is added. and water are added to form a second layer containing zinc oxide and native alpha starch on the outside of the first layer.

This powdery composition containing alpha starch and zinc oxide (hereinafter sometimes referred to as “this composition (1)”) is preferable as a powdery composition for coating rice seeds. The average particle diameter of this composition (1) 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 present composition (1) is the particle size measured with a laser diffraction/scattering type particle size distribution measuring device, and refers to the particle size at which the cumulative frequency is 50% in the volume-based frequency distribution. The average particle size of the composition (1) is measured by dispersing the particles of the composition (1) in water using a laser diffraction/scattering particle size distribution measuring device, MASTERSIZER 2000 (manufactured by Malvern), by the so-called wet measurement method. You can get it.

Additionally, the apparent relative density of the composition (1) is in the range of 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.50 to 1.8 g/mL, and more preferably 0.60 to 1.5 g/mL. . Since there is less scattering during the production of coated rice seeds, it is preferable that the apparent relative density of the present composition (1) is large. In the present invention, the apparent relative density of the composition (1) refers to a method in accordance with the test method specified in the Pesticide Process Test Method (Physical Property Test Method, Notification No. 71 of the Ministry of Farmers and Forestry of Japan dated February 3, 1965). saved by 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 the sieve and fill the container by gently sweeping with a brush. Immediately after rubbing off the excess of the sample using a slide glass, the sample is weighed, the weight of the contents is determined, and the apparent relative density is calculated using the following equation. The distance between the sieve and the upper edge of the container is 20 cm.

Apparent relative density (g/mL) = weight of contents / 100

This powdery composition containing alpha starch, zinc oxide, and iron oxide (hereinafter sometimes referred to as “this composition (2)”) is preferable as a powdery composition for coating rice seeds. The average particle diameter of this composition (2) is in the range of 0.01 to 150 ㎛, preferably 1 to 150 ㎛, more preferably 1 to 100 ㎛. In the present invention, the average particle size of the composition (2) is the particle size measured with a laser diffraction/scattering type particle size distribution measuring device, and refers to the particle size at which the cumulative frequency is 50% in the volume-based frequency distribution. The average particle size of the composition (2) is measured by dispersing the particles of the composition (2) in water using a laser diffraction/scattering particle size distribution measuring device, MASTERSIZER 2000 (manufactured by Malvern), by the so-called wet measurement method. You can get it.

In addition, the apparent relative density of the present composition (2) is, for example, 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.50 to 2.20 g/mL, more preferably 1.00 to 2.20 g/mL. is the range. Since there is less scattering during the production of coated rice seeds, it is preferable that the apparent relative density of the composition (2) is large. In the present invention, the apparent relative density of the composition (2) refers to a method in accordance with the test method specified in the Pesticide Process Test Method (Physical Property Test Method, Notification No. 71 of the Ministry of Farmers and Forestry of Japan dated February 3, 1965). saved by 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 the sieve and fill the container by gently sweeping with a brush. Immediately after rubbing off the excess of the sample using a slide glass, the sample is weighed, the weight of the contents is determined, and the apparent relative density is calculated using the following equation. The distance between the sieve and the upper edge of the container is 20 cm.

Apparent relative density (g/mL) = weight of contents / 100

The weight ratio of zinc oxide and iron oxide in this composition (2) is usually 1:1000 to 1000:1, preferably 1:1000 to 100:1, more preferably 1:200 to 10:1. It is a range. Considering the impact on plant growth and the environment, a range of 1:200 to 1:3 is desirable.

The present composition (1) may contain the present inorganic compound. When this composition (1) contains this inorganic compound, the weight ratio of zinc oxide and this inorganic compound in this composition (1) is usually 1:1000 to 1000:1, preferably 1:1000 to 100. :1, more preferably in the range of 1:200 to 10:1. Considering the impact on plant growth and the environment, a range of 1:200 to 1:3 is desirable.

Some examples of this composition (1) are shown below. In the examples below, % represents weight % with respect to the present composition (1).

An average particle size comprising alpha starch having a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C, zinc oxide, and at least one compound selected from the group consisting of clay and calcium carbonate. a powder composition having an apparent relative density in the range of 0.01 to 150 μm and an apparent relative density in the range of 0.30 to 2.0 g/mL;

An average particle size comprising alpha starch having a swelling degree of a 2% aqueous suspension in the range of 12 to 46 mL/g at 20°C, zinc oxide, and at least one compound selected from the group consisting of clay and calcium carbonate. a powder composition having a particle size in the range of 1 to 150 μm and an apparent relative density in the range of 0.50 to 1.8 g/mL;

An average particle size comprising alpha starch having a swelling degree of a 2% aqueous suspension in the range of 12 to 46 mL/g at 20°C, zinc oxide, and at least one compound selected from the group consisting of clay and calcium carbonate. a powder composition having a particle size in the range of 5 to 150 μm and an apparent relative density in the range of 0.60 to 1.5 g/mL;

An average of 2% aqueous suspension comprising alpha starch having a swelling degree at 20°C in the range of 10 to 48 mL/g, zinc oxide, at least one compound selected from the group consisting of chlorophyll and calcium carbonate. A powder composition having a particle diameter in the range of 0.01 to 150 ㎛ and an apparent relative density in the range of 0.30 to 2.0 g/mL;

An average of 2% aqueous suspension comprising alpha starch having a swelling degree at 20°C in the range of 12 to 46 mL/g, zinc oxide, at least one compound selected from the group consisting of chlorophyll and calcium carbonate. A powder composition having a particle size in the range of 1 to 150 ㎛ and an apparent relative density in the range of 0.50 to 1.8 g/mL;

An average of 2% aqueous suspension comprising alpha starch having a swelling degree at 20°C in the range of 12 to 46 mL/g, zinc oxide, at least one compound selected from the group consisting of chlorophyll and calcium carbonate. A powder composition having a particle size in the range of 5 to 150 ㎛ and an apparent relative density in the range of 0.60 to 1.5 g/mL;

A 2% aqueous suspension containing alpha starch with a swelling degree of 12 to 46 mL/g at 20°C, zinc oxide, and calcium carbonate, an average particle diameter in the range of 5 to 150 ㎛, and an apparent relative density. powder compositions ranging from 0.60 to 1.5 g/mL;

A 2% aqueous suspension containing 2.0 to 10.0% alpha starch, 0.5 to 50% zinc oxide, and 40 to 97.5% calcium carbonate, with a swelling degree at 20°C of 12 to 46 mL/g, with an average particle size of a powder composition having a particle size in the range of 5 to 50 μm and an apparent relative density in the range of 0.80 to 1.2 g/mL;

A 2% aqueous suspension containing 2.0 to 8.0% alpha starch, 0.5 to 30% zinc oxide, and 62 to 97.5% calcium carbonate, with a swelling degree at 20°C of 12 to 46 mL/g, with an average particle size of a powder composition having a particle size in the range of 5 to 50 μm and an apparent relative density in the range of 0.80 to 1.2 g/mL;

A 2% aqueous suspension consisting of 7.4% alpha starch with a swelling degree of 46 mL/g at 20°C, 0.9% zinc oxide, and 91.7% calcium carbonate, has an average particle diameter of 37.4 μm, and an apparent relative density of 1.0 g/g. mL phosphorus powder composition;

A 2% aqueous suspension consisting of 3.9% alpha starch with a swelling degree of 46 mL/g at 20°C, 4.8% zinc oxide, and 91.3% calcium carbonate, has an average particle diameter of 23.1 μm, and an apparent relative density of 1.1 g/g. mL phosphorus powder composition;

A 2% water suspension consisting of 3.9% alpha starch with a swelling degree of 46 mL/g at 20°C, 24.0% zinc oxide, and 72.1% calcium carbonate, has an average particle diameter of 27.0 μm, and an apparent relative density of 0.95 g/g. mL phosphorus powder composition;

A 2% aqueous suspension containing alpha starch with a swelling degree of 12 to 46 mL/g at 20°C, zinc oxide, and clay, an average particle diameter in the range of 5 to 150 ㎛, and an apparent relative density of 0.60. powder compositions ranging from ~1.5 g/mL;

A 2% aqueous suspension containing alpha starch with a swelling degree of 12 to 46 mL/g at 20°C, zinc oxide, and chlorophyllite, an average particle diameter in the range of 5 to 150 ㎛, and an apparent relative density. powder compositions ranging from 0.60 to 1.5 g/mL;

A 2% aqueous suspension containing 2.0 to 8.0% alpha starch with a swelling degree at 20°C of 12 to 46 mL/g, 0.5 to 30% zinc oxide, and 62 to 97.5% pyrophyllite, with an average particle size of a powder composition having a particle size in the range of 5 to 50 μm and an apparent relative density in the range of 0.80 to 1.2 g/mL; and

A powder composition with an average particle diameter of 24.2 ㎛, comprising 3.9% alpha starch, 9.6% zinc oxide, and 86.5% chlorophyll, with a swelling degree of 46 mL/g in a 2% aqueous suspension at 20°C.

Some examples of this composition (2) are shown below. In the examples below, % represents weight % with respect to the present composition (2).

A 2% aqueous suspension containing alpha starch with a swelling degree of 12 to 46 mL/g at 20°C, zinc oxide, and iron oxide, an average particle diameter in the range of 1 to 100 μm, and an apparent relative density. a powder composition ranging from 1.0 to 2.2 g/mL;

A 2% aqueous suspension containing 2.0 to 10.0% alpha starch with a swelling degree at 20°C of 12 to 46 mL/g, 0.5 to 50% zinc oxide, and 40 to 97.5% iron oxide, with an average particle size of a powder composition having a particle size in the range of 1 to 50 μm and an apparent relative density in the range of 1.0 to 2.0 g/mL;

A 2% aqueous suspension containing 2.0 to 8.0% alpha starch, 0.5 to 30% zinc oxide, and 62 to 97.5% iron oxide, with a swelling degree at 20°C of 12 to 46 mL/g, with an average particle size of a powder composition having a particle size in the range of 1 to 30 μm and an apparent relative density in the range of 1.2 to 2.0 g/mL;

A 2% water suspension consisting of 3.9% alpha starch with a swelling degree of 46 mL/g at 20°C, 24.0% zinc oxide, and 72.1% iron oxide, has an average particle diameter of 3.6 μm, and an apparent relative density of 1.31 g/g. mL phosphorus powder composition;

A 2% aqueous suspension consisting of 3.9% alpha starch with a swelling degree of 46 mL/g at 20°C, 9.6% zinc oxide, and 86.5% iron oxide, has an average particle diameter of 14.0 μm, and an apparent relative density of 1.71 g/g. mL phosphorus powder composition; and,

A 2% aqueous suspension consisting of 3.9% alpha starch with a swelling degree of 46 mL/g at 20°C, 4.8% zinc oxide, and 91.3% iron oxide, has an average particle diameter of 19.9 μm, and an apparent relative density of 1.91 g/g. mL phosphorus powder composition.

The method for producing this rice seed (hereinafter referred to as “this production method”) will be described. In this production method, rice seeds are usually used after soaking. Soaking can be performed as follows. First, put dried rice seeds in a bag such as a rice seed bag and soak in water. In order to obtain coated rice seeds with a high germination rate, it is desirable to soak them for 3 to 4 days at a water temperature of 15 to 20°C. After rice seeds are taken out of the water, excess moisture on the surface is removed by usually leaving them to stand or drying them in a dehydrator.

First, a method for producing coated rice seeds having a coating layer containing the present alpha starch, zinc oxide, and the present inorganic compound (hereinafter referred to as “this production method 1”) will be described. This production method 1 includes the following steps.

(1) adding this alpha starch, zinc oxide, this inorganic compound and water while rolling the rice seeds to form a coating layer containing this alpha starch, zinc oxide and this inorganic compound, and

(2) Drying the seeds obtained in step (1).

In this production method 1, first, while rolling the soaked rice seeds, a powder composition containing this alpha starch, zinc oxide, and this inorganic compound (hereinafter referred to as “powder composition X”) and water are added. , a step of forming a coating layer containing the present alpha starch, zinc oxide, and the present inorganic compound (hereinafter referred to as “Step 1”) is performed. In Step 1, water may be added first and then powder composition Additionally, water and powder composition X may be added simultaneously. Both water and powder composition Methods for adding water include dropping and spraying. After adding water and powder composition

The total amount of zinc oxide added in this production method 1 is usually in the range of 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. . Considering the impact on plant growth and the environment, a range of 0.1 to 25 parts by weight is preferable. The total amount of the inorganic compound added is usually 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, based on 100 parts by weight of dried rice seeds. The total amount of the powder composition The total amount of alpha starch added is usually in the range of 0.025 to 40 parts by weight, preferably 0.025 to 20 parts by weight, and more preferably 0.01 to 10 parts by weight, based on 100 parts by weight of dried rice seeds. Additionally, the weight ratio between the present alpha starch and the powder composition

In Step 1, a uniform coating layer can be formed by dividing and adding the powder composition In that case, the amount of powder composition Additionally, the total amount of water added is usually about 1/2 to 1/100, preferably about 1/3 to 1/10, of the total amount of the powder composition

In Step 1, when the powdered composition

After carrying out step 1, a step of drying the seeds obtained in step 1 is carried out to obtain the main rice seeds. Specifically, after performing step 1, rice seeds are taken out from the device, placed in a seedbed, spread thinly, left to dry. Typically, it is dried until the moisture content is less than 20% (% by weight relative to the coated rice seed). In the present invention, the moisture content of coated rice seeds means the value measured by drying 10 g of the sample at 105°C for 1 hour using an infrared moisture meter. As an infrared moisture meter, FD-610 manufactured by Getsuto Scientific Research Institute can be used. Additionally, instead of the above seedbed, a mat or plastic sheet may be used and spread thinly on top to dry.

Next, it has a coating layer containing the present alpha starch, zinc oxide, and the present inorganic compound, wherein the coating layer includes a first layer containing the present inorganic compound and zinc oxide formed on the outside of the first layer. A method for producing coated rice seeds having a second layer (hereinafter referred to as “this production method 2”) will be described. This production method 2 includes the following steps.

(1) (I) adding the alpha starch, the inorganic compound, and water while rolling the rice seeds to form a coating layer containing the alpha starch and the inorganic compound, and (II) the above steps. Adding alpha starch, zinc oxide, and water while rolling the seed obtained in step (I), forming a coating layer containing alpha starch and zinc oxide on the outside of the layer formed in step (I), and

(2) Drying the seeds obtained in step (1).

In this production method 2, first, while rolling the soaked rice seeds, a powder composition containing this alpha starch and this inorganic compound (hereinafter referred to as "powder composition W") and water are added to produce this alpha starch. and a step of forming a coating layer containing the present inorganic compound (hereinafter referred to as “Step I”). Step I can be performed in the same manner as Step 1 of the present production method 1, except that powder composition W is used instead of powder composition X. After carrying out Step I, while rolling the seed obtained in Step I, a powder composition containing alpha starch and zinc oxide (hereinafter referred to as “powder composition V”) and water are added to form the outer side of the layer formed in Step I. A step of forming a coating layer comprising alpha starch and zinc oxide (hereinafter referred to as “Step II”) is performed. Step II can be performed in the same manner as Step I, except that powder composition V is used instead of powder composition W.

The total amount of zinc oxide added in this production method 2 is usually in the range of 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. . Considering the impact on plant growth and the environment, a range of 0.1 to 25 parts by weight is preferable. The total amount of the inorganic compound added is usually 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, based on 100 parts by weight of dried rice seeds. The total amount of powder composition V added is usually in the range of 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, based on 100 parts by weight of dried rice seeds. The total amount of the powder composition W added is usually in the range of 5 to 250 parts by weight, preferably 5 to 200 parts by weight, more preferably 5 to 150 parts by weight, based on 100 parts by weight of dried rice seeds. The total amount of alpha starch added is usually in the range of 0.025 to 40 parts by weight, preferably 0.025 to 20 parts by weight, and more preferably 0.01 to 10 parts by weight, based on 100 parts by weight of dried rice seeds. Additionally, the weight ratio between this alpha starch and the powder composition V is usually in the range of 1:200 to 1:5, preferably 1:150 to 1:10. The weight ratio between this alpha starch and the powder composition W is usually in the range of 1:200 to 1:5, preferably 1:150 to 1:10.

After performing Step II, Step 2 and the subsequent step(s) of this manufacturing method 1 may be performed in the same manner.

Next, a method for producing coated rice seeds having a main coating layer 1, wherein the main coating layer 1 has a first layer containing iron oxide and a second layer containing zinc oxide formed on the outside of the first layer (hereinafter , written as “this manufacturing method 3”) will be described. This production method 3 includes the following steps.

(1) (I) adding alpha starch, iron oxide, and water while rolling the rice seeds to form a coating layer containing alpha starch, iron oxide, and (II) step (I) ) Adding alpha starch, zinc oxide, and water while rolling the seeds obtained in step (I) to form a coating layer containing alpha starch and zinc oxide on the outside of the layer formed in step (I), and

(2) Drying the seeds obtained in step (1).

In the present production method 3, first, while stirring the soaked rice seeds, the present alpha starch, a powder composition containing iron oxide (hereinafter referred to as "powder composition T") and water are added, and the present alpha starch and , a step of forming a coating layer containing iron oxide (hereinafter referred to as “Step 1’”) is performed. Step 1' can be performed in the same manner as Step 1 of the present production method 1, except that powder composition T is used instead of powder composition Z. After carrying out step 1', while rolling the seeds obtained in step 1', a powder composition containing alpha starch and zinc oxide (hereinafter referred to as "powder composition U") and water are added to form a powder composition in step 1'. A step of forming a coating layer containing alpha starch and zinc oxide on the outside of the layer (hereinafter referred to as "step 2'") is performed. Step 2' can be performed in the same manner as Step 1', except that the powder composition U is used instead of the powder composition T.

The total amount of zinc oxide added in this production method 3 is usually in the range of 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. . Considering the impact on plant growth and the environment, a range of 0.1 to 25 parts by weight is preferable. The total amount of iron oxide added is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, based on 100 parts by weight of dried rice seeds. The total amount of the powder composition T added is usually in the range of 5 to 250 parts by weight, preferably 5 to 200 parts by weight, more preferably 5 to 150 parts by weight, based on 100 parts by weight of dried rice seeds. The total amount of the powder composition U added is usually in the range of 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, based on 100 parts by weight of dried rice seeds. The total amount of alpha starch added is usually in the range of 0.025 to 40 parts by weight, preferably 0.025 to 20 parts by weight, and more preferably 0.01 to 10 parts by weight, based on 100 parts by weight of dried rice seeds. Additionally, the weight ratio between the present alpha starch and the powder composition U is usually in the range of 1:200 to 1:5, preferably 1:150 to 1:10. The weight ratio between this alpha starch and the powder composition U is usually in the range of 1:200 to 1:5, preferably 1:150 to 1:10.

After performing Step II, Step 2 and the subsequent step(s) of this manufacturing method 1 may be performed in the same manner.

This rice seed can be used in direct sowing cultivation of paddy rice, and the method is carried out by sowing the present rice seed directly in the paddy field. In the present invention, rice paddy refers to either a freshwater rice field or a flooded rice field. Specifically, sowing was done according to the method described in “Iron Coated Freshwater Direct Sowing Manual 2010” (Minoru Yamauchi, Agricultural and Food Industrial Technology Research Organization, Kinki China West Country Agricultural Research Center, March 2010, Non-patent Document 1). carry out. At that time, you may use a direct seeding machine for iron coating such as Tetsumakichan (manufactured by Kubota Co., Ltd.). By sowing by a conventional method in this way, good seedlings are achieved. After that, rice can be grown by maintaining normal cultivation conditions.

Additionally, pesticides and fertilizers may be applied before sowing, simultaneously with sowing, or after sowing. Such pesticides include fungicides, insecticides, and herbicides.

Example

The present invention will be explained in more detail by examples.

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

In the following production examples and comparative production examples, unless otherwise specified, rice seeds of Hinohikari were used, and iron oxide with an α-Fe ₂ O ₃ content of 78% and an average particle diameter of 42.7 ㎛ was used. do. Manufacturing was carried out at room temperature (about 20°C). Additionally, % represents weight%.

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

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

Type of zinc oxide: Zinc oxide, manufactured by Japan Chemical Industry Co., Ltd., average particle size; 0.26 ㎛

Zinc oxide different species: Zinc oxide, manufactured by Japan Chemical Industry Co., Ltd., average particle size; 0.24 ㎛

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

SS#80: Calcium carbonate, manufactured by Nitto Sebun Industry Co., Ltd., average particle size; 4.6 ㎛

Calcium carbonate for granulation: Calcium carbonate, manufactured by Yaksun Lime Co., Ltd., average particle size; 6.2 ㎛

Barite: Barium sulfate, manufactured by Neolight Heungsan Co., Ltd., average particle size; 12.4 ㎛

Shokouzan Clay S: Leaf pyrophyllite, manufactured by Shokouzan Mining Co., Ltd., average grain size; 6.7 ㎛

Rutile flour: titanium oxide, manufactured by Kinsei Martech Co., Ltd., average particle size; 14.6 ㎛

DL clay for dusting: foliar stone, made by Shokouzan Mining Co., Ltd., average grain size; 30.3 ㎛

Sun Zeolite MGF: Zeolite, Sun Zeolite Industry Co., Ltd., average particle size; 116㎛

DAE1K: Iron, made by DOWA IP Creation

KTS-1: Calcined gypsum, manufactured by Yoshino Gypsum Sales Co., Ltd.

Amirox No.1A: Swelling degree of alpha starch, 2% aqueous suspension at 20°C; 16 mL/g, manufactured by Japan Corn Starch Co., Ltd.

Corn Alpha Y: Alpha starch, swelling degree at 20°C of 2% aqueous suspension; 19 mL/g, manufactured by Sanwa Starch Industry Co., Ltd.

Amicol W: swelling degree of alpha starch, 2% aqueous suspension at 20°C; 6 mL/g, manufactured by Ijeon Chemical Co., Ltd.

Amicol KF: alpha starch, swelling degree at 20°C of 2% aqueous suspension; 45 mL/g, manufactured by Ijeon Chemical Co., Ltd.

Manufacturing Example 1

First, we manufactured a simple seed coating machine that can be used to coat small amounts of rice seeds. As shown in Fig. 1, attach a polyethylene cup 2 with a capacity of 500 mL to the end of shaft 1, insert it into the drive shaft of mixer 3 (Three-One Motor, Shinto Scientific), and mixer 3 so that the elevation angle is 45 degrees. A simple seed coating machine was produced by tilting it and attaching it to stand 4.

Next, 1 g of different types of zinc oxide and 0.1 g of Corn Alpha Y were mixed to obtain a powder composition (1). The average particle diameter of the powder composition (1) was 141.3 ㎛, and the apparent relative density was 0.35 g/mL.

About 100 mL of water was put into a 200 mL polyethylene cup, 20 g of dried rice seeds were added thereto, and soaked for 10 minutes. Afterwards, the rice seeds were taken out of the water, excess water on the surface was removed, and then placed into polyethylene cup 2 attached to the simple seed coating machine that was manufactured. By operating the simple seed coating machine in the range of 130 to 140 rpm of the mixer 3, the rice seeds are driven, and water is sprayed on the rice seeds with a sprayer, and an amount of about 1/4 of 1.1 g of the powder composition (1) (approx. 0.28 g) was added and allowed to adhere to rice seeds. When the powder composition (1) adhered to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (1) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. Thereafter, the same operation was repeated three times to allow 1.1 g of the powder composition (1) to adhere to the rice seeds to form a coating layer. The total amount of water used for coating was 0.2 g. The coated rice seeds taken out from the simple seed coating machine were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (1) of the present invention.

Production example 2

Powder composition (2) was obtained by mixing 10 g of zinc oxide 3N5 and 0.1 g of Amyrox No.1A. The average particle diameter of the powder composition (2) was 6.16 μm, and the apparent relative density was 0.54 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.1 g of the powder composition (2) was used, and an operation of dividing it into four parts was added to obtain the coated rice seed (2) of the present invention. The total amount of water used for coating was 2.8 g.

Production example 3

10 g of zinc oxide 3N5 and 0.6 g of Amycol W were mixed to obtain a powder composition (3). The average particle diameter of the powder composition (3) was 8.77 μm, and the apparent relative density was 0.54 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.6 g of the above powder composition (3) was divided into four parts and added, thereby obtaining the coated rice seed (3) of the present invention. The total amount of water used for coating was 2.8 g.

Production example 4

0.02 g of zinc oxide heterogeneous, 13.98 g of calcium carbonate G-100, 6 g of SS#80, and 0.8 g of Amicol W were mixed to obtain a powder composition (4). The average particle diameter of the powder composition (4) was 48.5 μm, and the apparent relative density was 1.1 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 20.8 g of the above powder composition (4) was divided into four parts and added, thereby obtaining the coated rice seed (4) of the present invention. The total amount of water used for coating was 3.6 g.

Production example 5

0.1 g of zinc oxide heterogeneous, 6.9 g of calcium carbonate G-100, 3 g of SS#80, and 0.8 g of Amicol W were mixed to obtain a powder composition (5). The average particle diameter of the powder composition (5) was 37.4 μm and the apparent relative density was 1.0 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.8 g of the above powder composition (5) was divided into four parts and added, thereby obtaining the coated rice seed (5) of the present invention. The total amount of water used for coating was 1.8 g.

Production example 6

1 g of zinc oxide heterogeneous, 13 g of calcium carbonate G-100, 6 g of SS#80, and 0.8 g of Amicol W were mixed to obtain a powder composition (6). The average particle diameter of the powder composition (6) was 23.1 μm, and the apparent relative density was 1.1 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 20.8 g of the above powder composition (6) was divided into four parts and added to obtain the coated rice seed (6) of the present invention. The total amount of water used for coating was 3.9 g.

Production example 7

A powder composition (7) was obtained by mixing 2.5 g of zinc oxide heterogeneous, 7.5 g of calcium carbonate G-100, and 0.4 g of Amicol W. The average particle diameter of the powder composition (7) was 27.0 μm, and the apparent relative density was 0.95 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the powder composition (7) was used, and an operation of adding it in four parts was performed to obtain coated rice seeds (7) of the present invention. The total amount of water used for coating was 2.0 g.

Production example 8

5 g of zinc oxide 3N5, 5 g of calcium carbonate for granulation, and 0.4 g of Amicol KF were mixed to obtain a powder composition (8). The average particle diameter of the powder composition (8) was 45.5 μm, and the apparent relative density was 0.57 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the powder composition (8) was used, and an operation of adding it in four parts was performed to obtain coated rice seeds (8) of the present invention. The total amount of water used for coating was 2.6 g.

Production example 9

10 g of zinc oxide 3N5, 10 g of calcium carbonate for granulation, and 0.8 g of Amyrox No. 1A were mixed to obtain a powder composition (9). The average particle diameter of the powder composition (9) was 44.0 μm, and the apparent relative density was 0.58 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 20.8 g of the above powder composition (9) was divided into four parts and added to obtain the coated rice seed (9) of the present invention. The total amount of water used for coating was 5.6 g.

Production example 10

1 g of zinc oxide 3N5, 9 g of calcium carbonate for granulation, and 0.4 g of Amycol W were mixed to obtain a powder composition (10). The average particle diameter of the powder composition (10) was 9.9 μm, and the apparent relative density was 0.61 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the above powder composition (10) was divided into four parts and added, thereby obtaining the coated rice seed (10) of the present invention. The total amount of water used for coating was 1.7 g.

Production example 11

9 g of zinc oxide 3N5, 1 g of barite, and 0.4 g of Amicol W were mixed to obtain a powder composition (11). The average particle diameter of the powder composition (11) was 9.2 μm, and the apparent relative density was 1.00 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the powder composition (11) was used, and an operation of adding it in four parts was performed to obtain the coated rice seed (11) of the present invention. The total amount of water used for coating was 2.5 g.

Production Example 12

9 g of zinc oxide 3N5, 1 g of Shokouzan Clay S, and 0.4 g of Amycol W were mixed to obtain a powder composition (12). The average particle diameter of the powder composition (12) was 9.8 μm, and the apparent relative density was 0.49 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the powder composition (12) was used, and an operation of adding it in four parts was performed to obtain the coated rice seed (12) of the present invention. The total amount of water used for coating was 2.9 g.

Production Example 13

A powder composition (13) was obtained by mixing 1 g of zinc oxide heterogeneity, 9 g of rutile flour, and 0.4 g of Amicol W. The average particle diameter of the powder composition (13) was 15.5 μm, and the apparent relative density was 1.08 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the powder composition (13) was used, and an operation of adding it in four parts was performed to obtain the coated rice seed (13) of the present invention. The total amount of water used for coating was 1.2 g.

Production example 14

A powder composition (14) was obtained by mixing 1 g of different types of zinc oxide, 9 g of DL clay for powder, and 0.4 g of Amycol W. The average particle diameter of the powder composition (14) was 24.2 ㎛, and the apparent relative density was 0.87 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the powder composition (14) was used, and an operation of adding the powder composition (14) in four portions was performed to obtain the coated rice seed (14) of the present invention. The total amount of water used for coating was 2.3 g.

Production Example 15

A powder composition (15) was obtained by mixing 1 g of zinc oxide heterogeneity, 9 g of pre-zeolite MGF, and 0.4 g of Amycol W. The average particle diameter of the powder composition (15) was 141.2 μm.

The following operations were performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.4 g of the powder composition (15) was used, and an operation of adding it in four parts was performed to obtain the coated rice seed (15) of the present invention. The total amount of water used for coating was 3.2 g.

Production example 16

After mixing 70.0 parts by weight of clothianidin and 30.0 parts by weight of Shokozan Clay S, they were pulverized with a centrifugal grinder to obtain powdered pesticide A. The average particle size of powdered pesticide A, determined by a wet measurement method using MASTERSIZER 2000 (manufactured by Malvern), was 13.0 μm.

1 g of zinc oxide heterogeneity, 9 g of calcium carbonate for granulation, 0.4 g of Amicol W, and 0.086 g of powdered pesticide A were mixed to obtain a powder composition (16). The average particle diameter of the powder composition (16) was 9.1 μm, and the apparent relative density was 0.57 g/mL.

Coating was performed according to the method described in Production Example 1. Instead of 1.1 g of the powder composition (1), 10.486 g of the above powder composition (16) was added in four parts to obtain the coated rice seed (16) of the present invention. The total amount of water used for coating was 1.9 g.

Production Example 17

9 g of calcium carbonate for granulation and 0.36 g of Amicol W were mixed to obtain a powder composition (17-1). The average particle diameter of the powder composition (17-1) was 8.57 μm and the apparent relative density was 0.63 g/mL.

Additionally, 1 g of zinc oxide 3N5 and 0.04 g of Amycol W were mixed to obtain a powder composition (17-2). The average particle diameter of the powder composition (17-2) was 5.6 μm and the apparent relative density was 0.54 g/mL.

Coating was performed according to the method described in Production Example 1. After soaking 20 g of dried rice seeds, using a simple seed coating machine, the rice seeds were sprayed with water using a sprayer, and an amount of about 1/4 of 9.36 g of the powder composition (17-1) (about 2.3 g) was soaked. ) was added and allowed to attach to rice seeds. In the case where the powder composition (17-1) adheres to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (17-1) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. . Thereafter, the same operation is repeated three times to cause 9.36 g of the powder composition (17-1) to adhere to the rice seeds to form a first coating layer containing calcium carbonate (hereinafter referred to as “first layer”). I ordered it. The total amount of water used for coating was 1.9 g.

Next, while operating the simple seed coating machine and maintaining the rolling state of the rice seeds, water was sprayed on the rice seeds with a sprayer, and an amount of about 1/4 of 1.04 g (about 0.26 g) of the powder composition (17-2) was applied. It was added and adhered to the outside of the first layer. When the powder composition (17-2) adheres to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (17-2) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. . Thereafter, the same operation is repeated three times to attach 1.04 g of the powder composition (17-2) to the outside of the first layer, and to the outside of the first layer, a second coating layer containing zinc oxide (hereinafter, (Write “Second Layer”) was formed. The total amount of water used for coating was 1.3 g.

The coated rice seeds taken out from the simple seed coating machine were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (17) of the present invention.

Production example 18

Next, 1 g of zinc oxide 3N5, 9 g of iron oxide, and 0.05 g of Amyrox No.1A were mixed to obtain a powder composition (18). The average particle diameter of the powder composition (18) was 58.6 μm, and the apparent relative density was 1.63 g/mL.

About 100 mL of water was put into a 200 mL polyethylene cup, 20 g of dried rice seeds were added thereto, and soaked for 10 minutes. Afterwards, the rice seeds were taken out of the water, excess water on the surface was removed, and then placed into polyethylene cup 2 attached to the simple seed coating machine that was manufactured. By operating the simple seed coating machine in the range of 130 to 140 rpm of the mixer 3, the rice seeds are driven, and water is sprayed on the rice seeds with a sprayer, and an amount of about 1/4 of 10.05 g of the powder composition (18) (about 2.5 g) was added and allowed to adhere to rice seeds. When the powder composition (18) adhered to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (18) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. Thereafter, the same operation was repeated three times to allow 10.05 g of the powder composition (18) to adhere to the rice seeds to form a coating layer. The total amount of water used for coating was 0.7 g. The coated rice seeds taken out from the simple seed coating machine were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (18) of the present invention.

Production Example 19

Powder composition (19) was obtained by mixing 5 g of zinc oxide 3N5, 5 g of iron oxide, and 0.1 g of Amyrox No.1A. The average particle diameter of the powder composition (19) was 19.0 μm, and the apparent relative density was 0.97 g/mL.

Coating was performed according to the method described in Production Example 18. Instead of 10.05 g of the powder composition (18), 10.1 g of the above powder composition (19) was added in four portions to obtain coated rice seeds (19) of the present invention. The total amount of water used for coating was 2.1 g.

Production example 20

9 g of zinc oxide 3N5, 1 g of iron oxide, and Amyrox No.1A 0.1 were mixed to obtain a powder composition (20). The average particle diameter of the powder composition (20) was 13.4 μm, and the apparent relative density was 0.63 g/mL.

Coating was performed according to the method described in Production Example 18. Instead of 10.05 g of the powder composition (18), 10.1 g of the above powder composition (20) was added in four portions to obtain coated rice seeds (20) of the present invention. The total amount of water used for coating was 2.8 g.

Production example 21

2 g of heterogeneous zinc oxide, 18 g of iron oxide, and 0.8 g of Amycol W were mixed to obtain a powder composition (21). The average particle diameter of the powder composition (21) was 14.0 μm, and the apparent relative density was 1.7 g/mL.

Coating was performed according to the method described in Production Example 18. Instead of 10.05 g of the powder composition (18), 20.8 g of the above powder composition (21) was added in four portions to obtain coated rice seeds (21) of the present invention. The total amount of water used for coating was 2.9 g.

Production example 22

2.5 g of heterogeneous zinc oxide, 7.5 g of iron oxide, and 0.4 g of Amicol W were mixed to obtain a powder composition (22). The average particle diameter of the powder composition (22) was 3.6 μm and the apparent relative density was 1.3 g/mL.

Coating was performed according to the method described in Production Example 18. Instead of 10.05 g of the powder composition (18), 10.4 g of the powder composition (22) was used, and the mixture was added in four portions to obtain coated rice seeds (22) of the present invention. The total amount of water used for coating was 1.7 g.

Production example 23

2.5 g of heterogeneous zinc oxide, 7.5 g of iron oxide, and 0.1 g of Amicol KF were mixed to obtain a powder composition (23). The average particle diameter of the powder composition (23) was 22.0 μm, and the apparent relative density was 1.02 g/mL.

Coating was performed according to the method described in Production Example 18. Instead of 10.05 g of the powder composition (18), 10.1 g of the above powder composition (23) was added in four portions to obtain coated rice seeds (23) of the present invention. The total amount of water used for coating was 1.9 g.

Production example 24

After mixing 70.0 parts by weight of clothianidin and 30.0 parts by weight of Shokozan Clay S, they were pulverized with a centrifugal grinder to obtain powdered pesticide B. The average particle size of powdered pesticide B, determined by a wet measurement method using MASTERSIZER 2000 (manufactured by Malvern), was 13.0 μm.

2.5 g of zinc oxide heterogeneous, 7.5 g of iron oxide, 0.4 g of Amicol W, and 0.086 g of powder pesticide B were mixed to obtain a powder composition (24). The average particle diameter of the powder composition (24) was 5.3 μm, and the apparent relative density was 0.98 g/mL.

Coating was performed according to the method described in Production Example 18. Instead of 10.05 g of the powder composition (18), 10.486 g of the above powder composition (24) was divided into four parts and added to obtain the coated rice seed (24) of the present invention. The total amount of water used for coating was 2.0 g.

Production example 25

9 g of iron oxide and 0.045 g of Amyrox No.1A were mixed to obtain a powder composition (25-1).

Additionally, 1 g of zinc oxide 3N5 and 0.005 g of Amyrox No.1A were mixed to obtain a powder composition (25-2).

Coating was performed according to the method described in Production Example 18. After soaking 20 g of dried rice seeds, using a simple seed coating machine, the rice seeds were sprayed with water using a sprayer, and an amount of about 1/4 of 9.045 g of the powder composition (25-1) (about 2.3 g) was soaked. ) was added and allowed to attach to rice seeds. In the case where the powder composition (25-1) adheres to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (25-1) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. . Thereafter, the same operation was repeated three times to cause 9.045 g of the powder composition (25-1) to adhere to the rice seeds to form a first coating layer containing iron oxide (hereinafter referred to as “first coating layer”). I ordered it. The total amount of water used for coating was 1.0 g.

Next, while operating the simple seed coating machine and maintaining the rolling state of the rice seeds, water was sprayed on the rice seeds with a sprayer, and an amount of about 1/4 of 1.005 g (about 0.25 g) of the powder composition (25-2) was added. was added and adhered to the outside of the first coating layer. When the powder composition (25-2) adheres to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (25-2) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. . Thereafter, the same operation is repeated three times to attach 1.005 g of the powder composition (25-2) to the outside of the first layer, and to the outside of the first coating layer, a second coating layer containing zinc oxide (hereinafter, (Write “second coating layer”) was formed. The total amount of water used for coating was 2.1 g.

The coated rice seeds taken out from the simple seed coating machine were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (25) of the present invention.

Production example 26

1 g of iron oxide and 0.01 g of Amyrox No.1A were mixed to obtain a powder composition (26-1).

Additionally, 9 g of zinc oxide 3N5 and 0.09 g of Amyrox No.1A were mixed to obtain a powder composition (26-2).

Coating was performed according to the method described in Production Example 18. After soaking 20 g of dried rice seeds, using a simple seed coating machine, the rice seeds were sprayed with water using a sprayer, and an amount of about 1/4 of 1.01 g of the powder composition (26-1) (about 0.25 g) was soaked. ) was added and allowed to attach to rice seeds. In the case where the powder composition (26-1) adheres to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (26-1) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. . Thereafter, the same operation was repeated three times to allow 1.01 g of the powder composition (26-1) to adhere to the rice seeds to form a first coating layer. The total amount of water used for coating was 0.2 g.

Next, while operating the simple seed coating machine and maintaining the rolling state of the rice seeds, water was sprayed on the rice seeds with a sprayer, and an amount of about 1/4 of 9.09 g (about 2.3 g) of the powder composition (26-2) was added. was added and adhered to the outside of the first coating layer. When the powder composition (26-2) adheres to the inner wall of the polyethylene cup 2, approximately the entire amount of the powder composition (26-2) added at once was allowed to adhere to the rice seeds by scraping it off using a spatula. . Thereafter, the same operation was repeated three times to attach 9.09 g of the powder composition (26-2) to the outside of the first coating layer, thereby forming a second coating layer on the outside of the first coating layer. The total amount of water used for coating was 3.4 g.

The coated rice seeds taken out from the simple seed coating machine were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (26) of the present invention.

Comparative Manufacturing Example 1

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

Coating was performed according to the method described in Production Example 1. After soaking 20 g of dried rice seeds, a simple seed coating machine was used to transfer water, and while spraying water onto 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. It was added and allowed to attach to rice seeds. When the iron mixture A adhered to the inner wall of the polyethylene cup 2, it was scraped off using a spatula, and approximately the entire amount of the iron mixture A added at once was allowed to adhere to the rice seeds. Thereafter, the same operation was repeated three times to attach 11 g of 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, while operating the simple seed coating machine, the rolling state of the rice seeds was maintained, and 0.5 g of KTS-1 was added and made to adhere to the outside of the coating layer. Coated rice seeds taken out from the simple seed coating machine were spread out on a stainless steel tray without overlapping each other, sprayed with water three times a day for two days to promote iron oxidation, and then dried. Dragon-coated rice seeds (I) were obtained.

Next, a test example is shown.

Test example 1

Approximately 30 g of soil was placed in a plastic Petri dish, moistened with water, and 50 grains of coated rice seeds were sprinkled on the soil surface. The Petri dish was left standing outdoors and photographed with a time-lapse camera to observe the state of the Petri dish. Coated rice seeds remaining one day after sowing were counted, and the survival rate was calculated using the following equation.

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

The results are shown in Table 1. In Table 1, “rice seeds (control)” refers to uncoated rice seeds, and since the seeds were eaten by birds such as sparrows, the “residual rate” was 0%.

Test example 2

A gauze soaked with water was spread on a plastic Petri dish, and 50 grains of coated rice seeds were sprinkled on it. The Petri dish was placed with a lid and left to stand in a thermostat set at 17°C. After 10 days, the presence or absence of germination was examined, and the germination rate was calculated using the following equation.

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

The results are shown in Table 2.

Test example 3

Ten grains of coated rice seeds were placed in a Petri dish containing 50 mL of water (water hardness: 3) and left 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

Approximately 30 g of soil was placed in a plastic Petri dish, moistened with water, and 50 grains of coated rice seeds were sprinkled on the soil surface. The Petri dish was left standing outdoors and photographed with a time-lapse camera to observe the state of the Petri dish. Coated rice seeds remaining one day after sowing were counted, and the survival rate was calculated using the following equation.

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

The results are shown in Table 4. Additionally, in Table 4, “rice seeds (control)” refers to uncoated rice seeds, and since the seeds were eaten by birds such as sparrows, the “residual rate” was 0%.

Test Example 5

A gauze soaked with water was spread on a plastic Petri dish, and 50 grains of coated rice seeds were sprinkled on it. The Petri dish was placed with a lid and left to stand in a thermostat set at 17°C. After 10 days, the presence or absence of germination was examined, and the germination rate was calculated using the following equation.

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

The results are shown in Table 5.

Test example 6

Ten grains of coated rice seeds were placed in a Petri dish containing 50 mL of water (water hardness: 3) and left 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.

1 shaft
2 polyethylene cups
3 mixer
4 stands

Claims (21)

A coated rice seed having a coating layer, wherein the coating layer comprises alpha starch, zinc oxide, and iron oxide having a swelling degree of a 2% water suspension at 20°C in the range of 10 to 48 mL/g, and the average of the zinc oxide Coated rice seeds with a particle size in the range of 0.1 to 50 ㎛ and a weight ratio of zinc oxide and iron oxide in the range of 1:200 to 10:1. The coated rice seed according to claim 1, wherein the coating layer has a first layer containing iron oxide and a second layer containing zinc oxide formed outside the first layer. A coated rice seed having a coating layer, wherein the coating layer has a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20 ° C., zinc oxide, and at least one selected from the group (A) below A compound comprising a compound, wherein the average particle diameter of the zinc oxide is in the range of 0.1 to 50 ㎛, and the weight ratio of zinc oxide to at least one compound selected from the following group (A) is in the range of 1:200 to 10:1. Coated rice seeds;
Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate. The coating according to claim 3, wherein the coating layer has a first layer containing at least one compound selected from the group (A), and a second layer containing zinc oxide formed on the outside of the first layer. Rice seeds. A powder composition containing alpha starch, zinc oxide, and iron oxide having a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C, wherein the average particle size of the zinc oxide is in the range of 0.1 to 50 ㎛, , a powdery composition in which the weight ratio of zinc oxide and iron oxide is in the range of 1:200 to 10:1. A powder composition comprising alpha starch, zinc oxide, and at least one compound selected from the group (A) below, wherein the swelling degree of a 2% aqueous suspension at 20°C is in the range of 10 to 48 mL/g, wherein the zinc oxide A powder composition in which the average particle diameter is in the range of 0.1 to 50 μm and the weight ratio of zinc oxide and at least one compound selected from the following group (A) is in the range of 1:200 to 10:1;
Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate. The powder composition according to claim 5, wherein the average particle diameter is in the range of 0.01 to 150 μm. The powder composition according to claim 5 or 6, wherein the apparent relative density is in the range of 0.30 to 2.50 g/mL. The powder composition according to claim 5 or 6, wherein the apparent relative density is in the range of 0.30 to 2.0 g/mL. A kit for producing coated rice seeds comprising alpha starch, zinc oxide and iron oxide having a swelling degree at 20°C of a 2% aqueous suspension in the range of 10 to 48 mL/g, wherein the average particle size of the zinc oxide is 0.1 to 0.1. A kit for producing coated rice seeds with a thickness in the range of 50 ㎛ and a weight ratio of zinc oxide and iron oxide in the range of 1:200 to 10:1. A kit for producing coated rice seeds comprising alpha starch, zinc oxide, and at least one compound selected from the following group (A), wherein the swelling degree at 20°C of a 2% aqueous suspension is in the range of 10 to 48 mL/g. , wherein the average particle diameter of the zinc oxide is in the range of 0.1 to 50 ㎛, and the weight ratio of zinc oxide and at least one compound selected from the following group (A) is in the range of 1:200 to 10:1. kit;
Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate. A method for producing coated rice seeds comprising the following steps:
(1) While rolling the rice seeds, alpha starch having a swelling degree of 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C, zinc oxide, iron oxide, and water are added to produce the alpha starch. forming a coating layer comprising zinc oxide and iron oxide, and
(2) drying the seeds obtained in step (1),
A method for producing coated rice seeds, wherein the average particle diameter of the zinc oxide is in the range of 0.1 to 50 ㎛, and the weight ratio of zinc oxide to iron oxide is in the range of 1:200 to 10:1. A method for producing coated rice seeds comprising the following steps:
(1) (I) While rolling the rice seeds, alpha starch having a swelling degree of 2% water suspension at 20°C in the range of 10 to 48 mL/g, iron oxide, and water are added, and the alpha starch and water are added. , forming a coating layer containing iron oxide, and (II) adding the alpha starch, zinc oxide, and water while rolling the seed obtained in step (I), thereby forming a layer formed in step (I). forming a coating layer containing the alpha starch and zinc oxide on the outside of the
(2) drying the seeds obtained in step (1),
A method for producing coated rice seeds, wherein the average particle diameter of the zinc oxide is in the range of 0.1 to 50 ㎛, and the weight ratio of zinc oxide to iron oxide is in the range of 1:200 to 10:1. Coated rice seeds produced by the method for producing coated rice seeds according to claim 12 or 13. A method for producing coated rice seeds comprising the following steps:
(1) While rolling rice seeds, a 2% aqueous suspension of alpha starch having a swelling degree at 20°C of 10 to 48 mL/g, zinc oxide, and at least one selected from the following group (A) Adding a compound and water to form a coating layer containing the alpha starch, zinc oxide, and at least one compound selected from the following group (A), and
(2) drying the seeds obtained in step (1);
Production of coated rice seeds, wherein the average particle diameter of the zinc oxide is in the range of 0.1 to 50 ㎛, and the weight ratio of zinc oxide and at least one compound selected from the following group (A) is in the range of 1:200 to 10:1. method.
Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate. A method for producing coated rice seeds comprising the following steps:
(1) (I) Alpha starch having a swelling degree of a 2% aqueous suspension in the range of 10 to 48 mL/g at 20°C while rolling rice seeds, and at least one compound selected from the following group (A) and adding water to form a coating layer containing the alpha starch and at least one compound selected from the group (A) below, and (II) rolling the seeds obtained in step (I), Adding the alpha starch, zinc oxide, and water to form a coating layer containing the alpha starch and zinc oxide on the outside of the layer formed in step (I), and
(2) drying the seeds obtained in step (1);
Production of coated rice seeds, wherein the average particle diameter of the zinc oxide is in the range of 0.1 to 50 ㎛, and the weight ratio of zinc oxide and at least one compound selected from the following group (A) is in the range of 1:200 to 10:1. method.
Group (A): A group consisting of barium sulfate, titanium oxide, clay, zeolite and calcium carbonate. Coated rice seeds produced by the method for producing coated rice seeds according to claim 15 or 16. delete delete delete delete