TW201715963A - Coated rice seed and method for producing same - Google Patents

Abstract

A coated rice seed formed having a coating layer, wherein the coating layer includes zinc oxide and an alpha starch having a degree of swelling of 10-48 mL/g in a 2% aqueous suspension at 20 DEG C.

Description

Rice seed coated and method for producing same

The present invention relates to coated rice seeds and methods for their manufacture.

The direct seeding cultivation system of rice is a method for cultivating rice seeds directly in paddy fields. In addition to the advantages of labor saving and the like, it is also easy to suffer from birds such as ducks or sparrows. The shortcomings of the food (birds). Since the reduction in the survival rate of seedlings due to bird damage is associated with a reduction in income, the bird's solution has been eagerly awaited. In the case of the conventional method for solving bird damage, for example, a method of preventing bird damage by water management has been proposed, but it is necessary to change the management method in response to the type of bird (see, for example, Non-Patent Document 1).

In addition, it is known that the iron-coated squid is a technique for suppressing the floating of seeds sown on the surface of the soil by coating the rice seeds with iron powder, and preventing the eating by the sparrows (see, for example, Non-Patent Document 2). However, since this technique is cured by oxidation of iron powder, it is necessary to dilute the management of the coated rice seeds such as heat generated during oxidation, and the management of the coated rice seeds is insufficient. Next, there is a question of reducing the germination rate. question. As a solution to such a problem, for example, a technique of coating rice seeds using a polyvinyl alcohol having a high degree of saponification and a coating material such as iron oxide is known (see Patent Document 1).

[Previous Technical Literature] [Patent Document]

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

[Non-patent literature]

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

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

However, the bird damage prevention effect of rice seeds coated with iron oxide can be said to be insufficient.

The present invention provides a coated rice seed which is less susceptible to bird damage and which inhibits floating and germination rate of seeds.

In order to solve the results of such research, the present inventors have found that a rice starch is coated and sown with zinc oxide in a range of 10 to 48 mL/g of a 2% aqueous suspension at 20 ° C. In paddy fields, bird damage can be alleviated, and seedling survival rate can be fully ensured in rice direct seeding cultivation.

That is, the present invention is as follows.

[item 1]

The invention relates to a coated rice seed which is coated with rice coated with a coating layer, wherein the coating layer comprises α-starch in a range of 10% to 48 mL/g of a swelling solution of 2% water suspension at 20° C. With zinc oxide.

[item 2]

The coated rice seed according to Item 1, wherein the coating layer comprises at least one selected from the group (A): Group (A): from barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate. The group that makes up.

[item 3]

The coated rice seed according to Item 2, wherein the coating layer has a first layer containing at least one selected from the group (A) and a zinc oxide containing the outer side of the first layer Made of 2 layers.

[item 4]

The coated rice seed of item 1 or 2, wherein the coating layer further comprises iron oxide.

[item 5]

The coated rice seed according to Item 4, wherein the aforementioned coating layer has a package The first layer containing iron oxide and the second layer containing zinc oxide disposed outside the first layer are formed.

[item 6]

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

[item 7]

The powdery composition according to Item 6, which is selected from at least one of the following group (A), and the group (A): a group consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate.

[item 8]

The powdery composition according to item 6 or 7, wherein the average particle diameter is in the range of 0.01 to 150 μm.

[item 9]

The powdery composition according to any one of items 6 to 8, wherein the apparent specific gravity is in the range of 0.30 to 2.50 g/mL.

[item 10]

The powdery composition according to any one of items 6 to 8, wherein the apparent specific gravity is in the range of 0.30 to 2.0 g/mL.

[item 11]

The powdery composition according to any one of items 6 to 10, which further contains iron oxide.

[item 12]

The powdery composition according to any one of items 6 to 11, wherein the oxidation The average particle diameter of zinc is in the range of 0.01 to 100 μm.

[item 13]

A kit for coating rice seeds, which comprises α-starch and zinc oxide in a range of 10% to 48 mL/g of swelling of 2% aqueous suspension at 20 °C.

[item 14]

The kit of item 13, which further comprises iron oxide.

[item 15]

The kit according to Item 13 or 14, which has at least one selected from the group consisting of (A): a group consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate. group.

[item 16]

A method for producing a coated rice seed having the following steps, (1) adding a 2% aqueous suspension to a starch having a swelling degree of 20 to 48 mL/g at 20 ° C while rotating the rice seed, and The zinc oxide and at least one selected from the group (A) below and water form a coating layer containing the α-starch, zinc oxide, and at least one selected from the group (A) below. Step, and (2) a step of drying the seed obtained in the above step (1), group (A): a group consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate.

[item 17]

A method for producing coated rice seeds having the following steps, (1) (I) while rotating the rice seed, adding a 2% aqueous suspension at a temperature of 20 ° C to a degree of swelling of 10 to 48 mL / g of alpha starch, and at least selected from the group (A) below a step of forming a coating layer comprising the alpha starch and at least one selected from the group (A) below, and (II) rotating the seed obtained in the step (I), Adding the aforementioned α-starch, zinc oxide, and water, forming a coating layer containing the aforementioned α-starch and zinc oxide on the outer side of the layer formed in the above step (I), and (2) performing the aforementioned steps ( 1) The step of drying the obtained seed, group (A): a group consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate.

[item 18]

A coated rice seed obtained by the production method of Item 17 or 18.

[item 19]

A method for producing a coated rice seed having the following steps, (1) adding a 2% aqueous suspension to a starch having a swelling degree of 20 to 48 mL/g at 20 ° C while rotating the rice seed, and The step of forming a coating layer containing the aforementioned α-starch, zinc oxide, and iron oxide with zinc oxide, iron oxide, and water, and (2) drying the seed obtained in the above step (1).

[item 20]

A method for producing a coated rice seed having the following steps, (1) (I) adding a 2% aqueous suspension while rotating the rice seed a step of forming a coating layer containing the α-starch and iron oxide in the range of 10 to 48 mL/g in a degree of swelling at 20 ° C, a step of forming a coating layer containing the above-mentioned α-starch and iron oxide, and (II) (I) a step of forming the coating layer containing the α-starch and the zinc oxide on the outer side of the layer formed in the step (I) while adding the α-starch, the zinc oxide, and the water while the obtained seed is rotated. (2) a step of drying the seed obtained in the above step (1).

[item 21]

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

The coated rice seed line of the invention is not susceptible to bird damage, and has suppressed the floating and germination rate of the seed, and the seedling survival rate can be sufficiently ensured in the direct seeding cultivation of rice.

1‧‧‧Axis

2‧‧‧Glass cup

3‧‧‧Mixer

4‧‧‧ bracket

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

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

The so-called rice seed in the present invention refers to a seed which is cultivated as a rice generally.

As such a variety, although indica rice and japonica rice are mentioned, it is preferable that it is a variety which is high in lodging resistance and germination.

The term "alpha starch" as used in the present invention means a starch having a degree of gelatinization of 90% or more, also referred to as gelatinized starch or gelatinized starch. The degree of gelatinization of the alpha starch of the present invention is determined by the analysis method of No. 51 of the Central Government of Tariffs. According to the analysis method No. 51 reported by the Central Analysis of Customs, the following is the following.

1. Modulation of the test drug Phosphate-citrate buffer solution (pH=4.0-5.0)

To 15 mL of a 10 M aqueous sodium hydroxide solution, 15 mL of 1 M phosphoric acid and 17 mL of 0.1 M citric acid were added to adjust to pH = 4.0-5.0.

Glucose convertase solution

Glucose-converting enzyme (manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in deionized water so that the valence was about 15 units per 1 mL.

Protein A

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

1.0 g of glycerol was made up to 25 mL using deionized water.

2. Modulation of the test solution

A uniform suspension (melt sample 1.25 g/100 mL deionized water) was prepared, and 2 mL of a 50 mL Erlenmeyer flask was taken per 4.0 mL of the suspension, and 3.35 mL of a phosphate-citric acid buffer solution was added to 1 bottle to become a liquid I. . 0.15 mL of a 10 M sodium hydroxide aqueous solution was added to another bottle, and the starch particles were completely swollen and collapsed at 37 ° C for 30 minutes, and then 1.5 mL of 1 M phosphoric acid and 1.7 mL of 0.1 M citric acid were added to become II liquid. . The two liquids were placed in a 37 ° C constant temperature bath, and after the temperature was stabilized, 2.0 mL of the glucose conversion enzyme solution was added to each liquid, and the starch in each liquid was reacted with glucose conversion enzyme for 120 minutes while being vibrated. Then, the enzyme was deactivated in a boiling bath, and 5.0 mL of the protein A solution, 5.0 mL of the B solution, and 1.0 mL of the glycerin standard solution were added to each solution. The resulting solution was separately transferred to a 50 mL centrifuge tube and centrifuged at 4000 rpm for 5 minutes. This supernatant was passed through a membrane filter (0.45 μm), and the obtained liquid was used as a glucose quantitative test solution (Ia solution and IIa solution).

3. Quantification of glucose

The weight of the glucose of the Ia solution and the IIa solution was quantified in a glucose set, glucose CII-Test Wako (manufactured by Wako Pure Chemical Industries, Ltd.).

4. Calculation of α degree

The degree of α degree is calculated as the ratio of the weight (g) of the glucose of the Ia liquid when the weight (g) of the glucose of the IIa liquid is used as a reference.

Degree of α degree (%) = weight of glucose in Ia liquid (g) / weight of glucose in IIa liquid (g) × 100

The α-starch is commercially available, and the commercially available α-starch is, for example, Amylox No. 1A (manufactured by Nippon Corn Starch Co., Ltd.) and corn αY (manufactured by Sanwa Starch Co., Ltd.).

The α-starch is preferably a powdery α-starch having a particle diameter of usually 1000 μm or less, preferably 800 μm or less. The particle size of the alpha starch in the present invention means a particle diameter measured by a laser diffraction and scattering type particle size distribution measuring apparatus, and the particle diameter of the volume reference frequency distribution is 100%. The particle size distribution of the alpha starch is used as a laser diffraction and scattering type particle size distribution measuring device by using MASTERSIZER 2000 (manufactured by MALVERN), which can be measured by dispersing particles of alpha starch in air, that is, a so-called dry measurement. Seek.

The degree of swelling of the alpha starch is the degree of swelling measured by the volumetric method. The degree of swelling of the 2% aqueous suspension at 20 ° C is the swelling degree of the α-starch obtained from a suspension in which 2% of the α-starch is suspended in water at 20 ° C. The specific measurement method of the degree of swelling is described below. First, add ions A 200 mL beaker of 100 mL of water was exchanged and 2.0 g of the sample was added little by little. After the whole amount was added, the mixture was stirred at room temperature for 5 minutes. Then, the obtained liquid was transferred in a 100 mL measuring cylinder equipped with a plug, and the stopper was placed in a constant temperature water bath at 20 ° C for 24 hours, and the degree of swelling (mL) was calculated by reading the apparent volume of the sample swelled in the container. /g). The degree of swelling of the alpha starch is from 10 to 48 mL/g, preferably from 12 to 46 mL/g.

The content of the α-starch in the rice seed is usually 0.01 to 15% by weight, preferably 0.01 to 10% by weight, more preferably 0.1 to 5% by weight.

The zinc oxide referred to in the present invention means a compound represented by ZnO, and commercially available zinc oxide can be used. Examples of the commercially available zinc oxide include zinc oxide 3N5 (manufactured by Kanto Chemical Co., Ltd.) and zinc oxide (manufactured by Nippon Chemical Industry Co., Ltd.). In the present invention, the use of zinc oxide having a purity of 99% or more (% by weight relative to the zinc oxide) is preferred. The purity of zinc oxide is determined in accordance with the test method specified in Japanese Industrial Standards (JIS) K1410. Further, powdery zinc oxide is usually used, and the zinc oxide has an average particle diameter of 0.01 to 100 μm, preferably 0.1 to 50 μm, more preferably 0.1 to 10 μm. The average particle diameter of the zinc oxide in the present invention means a particle diameter measured by a laser diffraction and scattering type particle size distribution measuring apparatus, and the particle diameter of the volume reference frequency distribution is 50%. The average particle diameter of zinc oxide is used as a laser diffraction and scattering type particle size distribution measuring apparatus by using a Mastersizer 2000 (manufactured by Malvern), which can be measured by dispersing zinc oxide particles in water. Got it.

The content of zinc oxide in the rice seed is usually from 0.005 to 80% by weight, preferably from 0.01 to 70% by weight, more preferably from 0.02 to 50% by weight. When considering the development of the plant and the influence on the environment, it is preferably in the range of 0.02 to 15% by weight.

The coating layer may contain at least one selected from the group (A) (hereinafter referred to as an inorganic compound). As the clay of the present inorganic compound, Shoushan Stone and kaolin can be cited. Further, since the adhesion to rice seeds is good, the inorganic compound is preferably at least one selected from the group consisting of clay and calcium carbonate, and particularly preferably calcium carbonate.

In the present invention, the use of the powdery inorganic compound is preferably 200 μm or less, preferably 150 μm or less. The average particle diameter of the present inorganic compound in the present invention means a particle diameter measured by a laser diffraction and scattering type particle size distribution measuring apparatus, and the particle diameter of the volume reference frequency distribution is 50%. The average particle diameter of the present inorganic compound is used as a laser diffraction and scattering type particle size distribution measuring apparatus by using a Mastersizer 2000 (manufactured by Malvern), which can be measured by dispersing particles of the inorganic compound in water, that is, a so-called wet type measurement. Seek.

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

In the case where the coating layer contains the present inorganic compound, the content of the rice seed is usually from 0.5 to 80% by weight, preferably from 1 to 70% by weight, more preferably from 1 to 50% by weight.

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

Examples of the insecticidal active ingredient include Clothianidin, Imidacloprid, and Thiamethoxam.

Examples of the bactericidal active ingredient include Isotianil and Furametpy.

Examples of the herbicidal active ingredient include Imazosulfuron and Bromobutide.

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

In the present invention, the use of the powdery agrochemical active ingredient, if necessary, may be carried out by mixing with the inorganic compound, and may be pulverized into a powdery agricultural chemical using a pulverizer such as a dry pulverizer. The average particle diameter of the powdery pesticide is usually 200 μm or less, preferably 150 μm or less. The average particle diameter of the powdery pesticide in the present invention means a particle diameter measured by a laser diffraction and scattering type particle size distribution measuring apparatus, and the particle diameter of the volume reference frequency distribution is 50%. Further, the average particle diameter of the powdery pesticide in the case where the powdery pesticide is a mixture with the present inorganic compound means the average particle diameter of the mixture. The average particle size of the powdered pesticide is used as a laser diffraction and scattering type particle size distribution measuring apparatus by using a Mastersizer 2000 (manufactured by Malvern), which can be measured by dispersing particles of powdered pesticides in water, that is, a so-called wet type measurement. Seek.

In the case where the coating layer contains a pesticidal active ingredient, the content of the rice seed is usually 0.001 to 3% by weight, preferably 0.005 to 2% by weight, more preferably 0.01 to 2% by weight.

The aforementioned coating layer may contain a colorant. Examples of the coloring agent include pigments, pigments, and dyes, and among them, the use of the pigment is preferred. As the pigment, the use of the red or blue pigment is preferably, for example, ultramarine blue Nubix G-58 (blue pigment, manufactured by Nubiola Co., Ltd.) and Toda Color 300R (red pigment, manufactured by Toda Industrial Co., Ltd.). ).

The components used for the production of the rice seed may be used singly or in combination of all or at least two of them. The kit of the present invention (hereinafter referred to as the kit) has the present alpha starch and zinc oxide, and the like can be placed in one container or in two or more containers. That is, the kit can include more than one container. In the case where the kit includes two or more containers, different components can be placed in individual containers. Further, the kit may contain other components such as iron oxide, the present inorganic compound, and a pesticidal active ingredient (hereinafter referred to as component α).

The rice seed can be obtained by forming a coating layer (hereinafter referred to as the coating layer 1) containing the present α-starch, zinc oxide, and optionally iron oxide or the present inorganic compound by rice seed.

The coating layer 1 is formed by attaching the α-starch and zinc oxide, and optionally using the iron oxide or the inorganic compound while rotating the rice seed, thereby adhering to the rice seed. As a device for rotating rice seeds, a device used for conventional iron coating such as a coating machine can be used. The alpha starch and zinc oxide, and optionally the iron oxide or the present The inorganic compounds may be used singly or in combination. When the α-starch and zinc oxide are mixed, and the iron oxide or the inorganic compound to be used arbitrarily is used, a powdery composition containing the α-starch and zinc oxide, and optionally an iron oxide or the present inorganic compound is used. Further, when the component α is used, the component α may be used alone, or may be added to the component α in a powdery composition containing the α-starch and zinc oxide.

The method of forming the coating layer 1 by using a powdery composition containing the present α-starch and zinc oxide (hereinafter referred to as a powdery composition Z) will be described below.

While the rice seed was rotated, the powdery composition Z and water were added, and the present coating layer 1 was formed on the rice seed. The alpha starch acts as a binder to bind zinc oxide to rice seeds.

In the case of using the present inorganic compound, the inorganic compound is added to the powdery composition Z in the above-described method, or a powdery composition containing the present α-starch and the present inorganic compound (hereinafter referred to as a powdery composition Y) is prepared. With the powder composition Z, these can be added separately. In the case of adding separately, the powdery composition Y is added first, and then the powdery composition Z is added, whereby the first layer containing the inorganic compound and the zinc oxide provided on the outer side of the first layer can be obtained. The second layer of this rice seed. Specifically, while the rice seed is rotated, the powdery composition Y and water are added to form the first layer containing the inorganic compound and the α-starch, and the powdery composition Z is added directly to maintain the rotation state of the rice seed. And water is formed on the outer side of the first layer to form a second layer containing zinc oxide and the present alpha starch.

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

Further, the apparent specific gravity of the composition (1) is 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.50 to 1.8 g/mL, more preferably 0.60 to 1.5 g/mL. Since the coated rice seeds are less scattered during the manufacture, the apparent specific gravity of the present composition (1) is preferably larger. In the present invention, the apparent specific gravity of the present composition (1) refers to a method by which the test method specified in the pesticide test method (physical test method, No. 71 of the Ministry of Agriculture and Forestry of the Republic of Korea on February 3, 2015) Seek. This method is to place a standard mesh of 8 mesh on a metal drum container of 100 mL having an inner diameter of 50 mm (the test sieve specified in Japanese Industrial Standard (JIS) Z8801-1 with a diameter of 200 mm and a depth of 45 mm). Put the sample into it and gently spread it to fill the container with a brush. Immediately, the excess portion was scraped off using a glass slide to measure the weight of the contents, and the apparent specific gravity was calculated by the following formula. However, the distance between the sieve and the upper edge of the container was set to 20 cm.

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

A powdery composition containing the present α-starch, zinc oxide, and iron oxide (hereinafter sometimes referred to as the composition (2)) is suitable as a powdery composition for rice seed coating. The average particle diameter of the composition (2) is from 0.01 to 150 μm, preferably from 1 to 150 μm, more preferably from 1 to 100 μm. The average particle diameter of the present composition (2) in the present invention means a particle diameter measured by a laser diffraction and scattering type particle size distribution measuring apparatus, and the particle diameter of the volume reference frequency distribution is 50%. The average particle diameter of the composition (2) is used as a laser diffraction and scattering type particle size distribution measuring apparatus by using MASTERSIZER 2000 (manufactured by MALVERN), and can be determined by dispersing particles of the composition (2) in water. The method, which is called dry measurement, is obtained.

Further, the apparent specific gravity of the composition (2) is, for example, 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.50 to 2.20 g/mL, more preferably 1.00 to 2.20 g/mL. Since the coated rice seeds are less scattered during the manufacture, the apparent specific gravity of the present composition (2) is preferably larger. In the present invention, the apparent specific gravity of the present composition (2) refers to a method by which the test method specified in the pesticide test method (physical test method, No. 71 of the Ministry of Agriculture and Forestry of the Republic of Korea on February 3, 2015) Seek. This method is to place a standard mesh of 8 mesh on a metal drum container of 100 mL having an inner diameter of 50 mm (the test sieve specified in Japanese Industrial Standard (JIS) Z8801-1 with a diameter of 200 mm and a depth of 45 mm). Put the sample into it and gently spread it to fill the container with a brush. Immediately, the excess portion was scraped off using a glass slide to measure the weight of the contents, and the apparent specific gravity was calculated by the following formula. However, the distance between the sieve and the upper edge of the container is defined as 20cm.

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

The weight ratio of zinc oxide to iron oxide in the composition (2) is usually from 1:1000 to 1000:1, preferably from 1:1000 to 100:1, more preferably from 1:200 to 10:1. When considering the development of plants and the influence on the environment, it is preferably in the range of 1:200 to 1:3.

The present composition (1) may contain the present inorganic compound. When the present composition (1) is a compound containing the present inorganic compound, the weight ratio of the zinc oxide to the inorganic compound in the 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. When considering the development of plants and the influence on the environment, it is preferably in the range of 1:200 to 1:3.

Several of the examples of the composition (1) are shown below. In the following examples, % indicates the weight % relative to the composition (1).

‧ comprising at least one selected from the group consisting of alpha starch in a range of 10 to 48 mL/g from a 2% aqueous suspension at 20 ° C, and zinc oxide, clay, and calcium carbonate, and an average particle size a powder composition having a diameter in the range of 0.01 to 150 μm and an apparent specific gravity of 0.30 to 2.0 g/mL; and a range of a swelling degree selected from a 2% aqueous suspension at 20 ° C of 12 to 46 mL/g. a powdery composition of at least one of a group consisting of α-starch, zinc oxide, clay, and calcium carbonate, and having an average particle diameter of 1 to 150 μm and an apparent specific gravity of 0.50 to 1.8 g/mL. ‧containing alpha starch selected from a 2% aqueous suspension at 20 ° C with a degree of swelling of 12 to 46 mL / g, with zinc oxide, with clay and calcium carbonate At least one of the group consisting of, and having an average particle diameter of 5 to 150 μm, a powdery composition having an apparent specific gravity of 0.60 to 1.5 g/mL; and ‧ comprising a suspension selected from 2% water at 20 The degree of swelling of °C is at least one of α-starch in the range of 10 to 48 mL/g, and a group consisting of zinc oxide, and Shoushan stone and calcium carbonate, and the average particle diameter is in the range of 0.01 to 150 μm, and the apparent specific gravity is a powdery composition in the range of 0.30 to 2.0 g/mL; ‧ an alpha starch selected from the range of 12 to 46 mL/g of a suspension of 2% aqueous suspension at 20 ° C, and zinc oxide, and Shoushan stone and carbonic acid At least one of the group consisting of calcium, and having an average particle diameter of 1 to 150 μm, a powdery composition having an apparent specific gravity of 0.50 to 1.8 g/mL; and ‧ comprising a suspension selected from 2% water At least one of a group consisting of α-starch in a range of 12 to 46 mL/g at a temperature of 20° C., and a group consisting of zinc oxide, and Shoushan stone and calcium carbonate, and having an average particle diameter of 5 to 150 μm, is apparent a powdery composition having a specific gravity of 0.60 to 1.5 g/mL; ‧ a starch containing 2% aqueous suspension at a temperature of 20 ° C and a swelling degree of 12 to 46 mL/g, and oxygen Zinc, calcium carbonate, and an average particle size of 5 to 150 μm, an apparent specific gravity of 0.60 to 1.5 g / mL of the powder composition; ‧ 2% water suspension at 20 ° C swelling degree The range of α-starch in the range of 12~46mL/g is 2.0~10.0%, 0.5~50% with zinc oxide, 40~97.5% with calcium carbonate, and the average particle size is 5~50μm. The apparent specific gravity is 0.80~1.2g. Powder composition in the range of /mL; ‧containing 2% water suspension at 20 ° C swelling degree of 12 ~ 46mL / g The range of alpha starch is 2.0 to 8.0%, zinc oxide is 0.5 to 30%, calcium carbonate is 62 to 97.5%, and the average particle diameter is in the range of 5 to 50 μm, and the apparent specific gravity is in the range of 0.80 to 1.2 g/mL. a powdery composition; ‧ a 2% aqueous suspension having a degree of swelling at 20 ° C of 46 mL / g of 7.4% of alpha starch, 0.9% of zinc oxide, and 91.7% of calcium carbonate, and the average particle size is a powder composition having a range of 37.4 μm and an apparent specific gravity of 1.0 g/mL; 3.9% of a starch having a degree of swelling of 2% aqueous suspension at 20 ° C of 46 mL/g, and zinc oxide 4.8%, composed of calcium carbonate 91.3%, and an average particle diameter of 23.1 μm, a powdery composition having an apparent specific gravity of 1.1 g/mL; ‧ a swelling of 2% aqueous suspension at 20 ° C The degree is 46%/g of α-starch 3.9%, zinc oxide 24.0%, and calcium carbonate 72.1%, and the average particle diameter is 27.0 μm, and the apparent specific gravity is 0.95 g/mL. Composition; ‧Alpha starch containing 2% aqueous suspension at a temperature of 20 ° C in the range of 12 to 46 mL / g, zinc oxide, and clay, and an average particle size of 5 to 150 μm, apparent specific gravity Powdered in the range of 0.60 to 1.5 g/mL ‧Inclusions: Included in the range of 2% water suspension at 20 ° C in the range of 12 ~ 46mL / g of alpha starch, and zinc oxide, and Shoushan stone, and the average particle size of 5 ~ 150μm range, apparent specific gravity a powdery composition in the range of 0.60 to 1.5 g/mL; ‧ a swelling degree of 2% aqueous suspension at 20 ° C of 12 to 46 mL/g The range of alpha starch 2.0 ~ 8.0%, with zinc oxide 0.5 ~ 30%, and Shoushan stone 62 ~ 97.5%, and the average particle size of 5 ~ 50μm range, the apparent specific gravity of the range of 0.80 ~ 1.2g / mL of the powder And ‧ from a 2% aqueous suspension at a temperature of 20 ° C with a degree of swelling of 46 mL / g of alpha starch 3.9%, with zinc oxide 9.6%, and Shoushan stone 86.5%, and an average particle size of 24.2 μm Powdery composition.

Several of the examples of the composition (2) are shown below. In the following examples, % indicates the weight % relative to the composition (2).

‧Alpha starch containing 2% water suspension at a temperature of 20 ° C in the range of 12 to 46 mL / g, zinc oxide, and iron oxide, and the average particle size is in the range of 1 to 100 μm, the apparent specific gravity is 1.0 a powdery composition in the range of ~2.2g/mL; ‧ 2.0% to 10.0% of α-starch containing 2% aqueous suspension in the range of 12~46mL/g at 20°C, and 0.5~50% with zinc oxide And a powdery composition having an iron oxide content of 40 to 97.5% and an average particle diameter of 1 to 50 μm, an apparent specific gravity of 1.0 to 2.0 g/mL; and a 2% aqueous suspension at 20 ° C The degree of swelling is 2.0 to 8.0% of α-starch in the range of 12 to 46 mL/g, 0.5 to 30% with zinc oxide, 62 to 97.5% with iron oxide, and the average particle diameter is in the range of 1 to 30 μm, and the apparent specific gravity is 1.2. a powdery composition in the range of ~2.0 g/mL; ‧ 3.9% of α-starch in a range of 46 mL/g of a 2% aqueous suspension at a concentration of 46 mL/g, 24.0% with zinc oxide, and 72.1% with iron oxide a powdery composition having an average particle diameter of 3.6 μm and an apparent specific gravity of 1.31 g/mL; ‧ From 2% aqueous suspension, the degree of swelling at 20 ° C is 46% / g of alpha starch 3.9%, with zinc oxide 9.6%, and iron oxide 86.5%, and the average particle size is 14.0 μm, apparent a powdery composition having a specific gravity of 1.71 g/mL; and ‧ 3.9% of a starch having a degree of swelling at 20 ° C of 2% aqueous suspension at a concentration of 46 mL/g, 4.8% with zinc oxide, and 91.3 with iron oxide A powdery composition composed of % and having an average particle diameter of 19.9 μm and an apparent specific gravity of 1.91 g/mL.

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

After the rice seeds are taken out of the water, they are usually left to stand or applied to a dehydrator to remove excess water from the surface.

First, a method for producing coated rice seeds (hereinafter referred to as the production method 1) having a coating layer containing the α-starch and zinc oxide and the present inorganic compound will be described. The manufacturing method 1 has the following steps.

(1) a step of forming the coating layer containing the α-starch, the zinc oxide, and the inorganic compound while adding the α-starch, the zinc oxide, the inorganic compound, and water while rotating the rice seed, and (2) a step of drying the seed obtained in the above step (1).

In the production method 1, first, a powdery composition (hereinafter referred to as a powdery composition X) containing water of the present α-starch, zinc oxide, and the present inorganic compound and water are added while rotating the seeded rice seed, and the inclusion is carried out. The step of forming the α-starch, the zinc oxide, and the coating layer of the present inorganic compound (hereinafter referred to as step 1). In step 1, water can be added, followed by powdery composition X, and the order is reversed. Further, water and powdery composition X can be simultaneously added. Both the water and the powdery composition X are added in such a manner as to apply rice seeds in a rotating state. As a method of adding water, it may be any of dripping and spraying. After adding water and powdery composition X, the rotation state of the rice seeds is maintained, and the present α-starch is used as a binder to adhere zinc oxide and the present inorganic compound to rice seeds.

The total amount of zinc oxide added in the production method 1 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, per 100 parts by weight of the dry rice seed. When considering the development of the plant and the influence on the environment, it is preferably in the range of 0.1 to 25 parts by weight. The total amount of the inorganic compound added is usually from 1 to 200 parts by weight, preferably from 1 to 150 parts by weight, more preferably from 1 to 100 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the powdery composition X added is usually 5 to 500 parts by weight, preferably 5 to 300 parts by weight, more preferably 10 to 200 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the α-starch added is usually 0.025 to 40 parts by weight, preferably 0.025 to 20 parts by weight, more preferably 0.01 to 10 parts by weight, per 100 parts by weight of the dry rice seed. Moreover, the weight ratio of the alpha starch to the powder composition X is usually 1:200 to 1:5, preferably 1:150 to 1:10. The scope.

In step 1, the powdery composition X is separated for addition, and a uniform coating layer can be formed by repeating step 1. In this case, the amount of the powder composition X to be added in one shot is usually from 1 to 1/10, preferably from about 1/2 to 1/5, based on the total amount of the powder composition X. Further, the total amount of water added is usually 1/2 to 1/100, preferably about 1/3 to 1/10, of the total amount of the powdery composition X.

In the case where the powdery composition X adheres to the inner wall of the apparatus or the like in step 1, a slight amount of the added powdery composition X can be attached to the rice seed by scraping off using a doctor blade or the like.

After the step 1 is carried out, the step of drying the seed obtained in the step 1 is carried out to obtain the rice seed. Specifically, after performing step 1, the rice seeds are taken out from the apparatus, placed in a seedling box, and flattened, and allowed to stand to be dried. It is usually dried to a moisture content as low as 20% (relative to the weight % of coated rice seeds). In the present invention, the moisture content of the coated rice seed means a value measured by drying the sample 10 g at 105 ° C for 1 hour using an infrared moisture meter. As the infrared moisture meter, FD-610 manufactured by Ketsuto Scientific Research Institute can be used. Further, instead of using the above-mentioned seedling box, a mat or a vinyl sheet may be used, and it may be flattened and dried.

Next, in the case of a coating layer having the present alpha starch and zinc oxide and the present inorganic compound, the coating layer has a first layer containing the inorganic compound and zinc oxide including the outer side of the first layer. The method for producing the coated rice seed of the second layer (hereinafter referred to as the production method 2) will be described. The manufacturing method 2 has the following steps.

(1) (I) a step of adding the alpha starch, the inorganic compound, and water to form a coating layer containing the alpha starch and the inorganic compound while rotating the rice seed, and (II) a step of rotating the seed obtained in the step (I), adding the α-starch, zinc oxide, and water, forming a coating layer containing the α-starch and zinc oxide on the outer side of the layer formed in the step (I), And (2) a step of drying the seed obtained in the aforementioned step (1).

In the production method 2, first, the powdered composition containing the present α-starch and the present inorganic compound (hereinafter referred to as the powder composition W) and water are added while rotating the rice seeds soaked, and the α-starch is contained. And a step of forming a coating layer of the inorganic compound (hereinafter referred to as step I). In the step I, the same procedure as in the first step of the production method 1 can be carried out except that the powdery composition W is used instead of the powdery composition X. After performing step I, while the seed obtained in step I is rotated, a powdery composition comprising the present alpha starch and zinc oxide (hereinafter referred to as powder composition V) and water are added to the layer formed in step I. The step of forming a coating layer containing the present alpha starch and zinc oxide is carried out on the outer side (hereinafter referred to as step II). Step II can be carried out in the same manner as in the step I except that the powdery composition W is replaced with the powdery composition V.

The total amount of zinc oxide added in the production method 2 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, per 100 parts by weight of the dry rice seed. When considering the development of the plant and the influence on the environment, it is preferably in the range of 0.1 to 25 parts by weight. The total amount of the inorganic compound added is 100% relative to the dry rice seed. The amount is usually from 1 to 200 parts by weight, preferably from 1 to 150 parts by weight, more preferably from 1 to 100 parts by weight. The total amount of the powdery composition V added is usually 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the powder composition W added is usually 5 to 250 parts by weight, preferably 5 to 200 parts by weight, more preferably 5 to 150 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the α-starch added is usually 0.025 to 40 parts by weight, preferably 0.025 to 20 parts by weight, more preferably 0.01 to 10 parts by weight, per 100 parts by weight of the dry rice seed. Further, the weight ratio of the α-amylose to the powdery composition V is usually in the range of 1:200 to 1:5, preferably 1:150 to 1:10. The weight ratio of the α-starch to the powder composition W is usually in the range of 1:200 to 1:5, preferably 1:150 to 1:10.

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

Next, in the present coating layer 1, the coating layer 1 has a first layer containing iron oxide and a coated rice seed including a second layer of zinc oxide provided outside the first layer. The manufacturing method (hereinafter referred to as the production method 3) will be described. The manufacturing method 3 has the following steps.

(1) (I) adding the present alpha starch, iron oxide, and water to form a coating layer containing the alpha starch and iron oxide while rotating the rice seed, and (II) (I) The obtained seed is rotated while adding the alpha starch, zinc oxide, and water, in the form of the aforementioned step (I) The outer layer of the layer forms a step of coating the coating layer of the present alpha starch and zinc oxide, and (2) the step of drying the seed obtained in the above step (1).

In the production method 3, first, the powdered composition containing the α-starch and the iron oxide (hereinafter referred to as the powder composition T) and water are added while rotating the rice seeds soaked, and the α-starch is contained. A step of forming a coating layer with iron oxide (hereinafter referred to as step 1'). The step 1' can be carried out in the same manner as in the first step of the production method 1 except that the powdery composition T is used instead of the powdery composition Z. After the step 1' is carried out, while the seed obtained in the step 1' is rotated, a powdery composition (hereinafter referred to as a powder composition U) containing the α-starch and zinc oxide is added, and water is added in the step 1'. The outer side of the formed layer is subjected to a step of forming a coating layer containing the present alpha starch and zinc oxide (hereinafter referred to as step 2'). Step 2' may be carried out in the same manner as in the step 1' except that the powdery composition T is replaced with the powdery composition U.

The total amount of zinc oxide added in the production method 3 is usually 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, per 100 parts by weight of the dry rice seed. When considering the development of the plant and the influence on the environment, it is preferably in the range of 0.1 to 25 parts by weight. The total addition amount of the iron oxide is usually from 1 to 200 parts by weight, preferably from 1 to 150 parts by weight, more preferably from 1 to 100 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the powdery composition T added is usually 5 to 250 parts by weight, preferably 5 to 200 parts by weight, more preferably 5 to 150 parts by weight, per 100 parts by weight of the dry rice seed.

The total amount of the powdery composition U added is usually 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, per 100 parts by weight of the dry rice seed. The total amount of the α-starch added is usually 0.025 to 40 parts by weight, preferably 0.025 to 20 parts by weight, more preferably 0.01 to 10 parts by weight, per 100 parts by weight of the dry rice seed. Further, the weight ratio of the α-starch to the powder composition U is usually in the range of 1:200 to 1:5, preferably in the range of 1:150 to 1:10. The weight ratio of the α-starch to the powder composition U is usually in the range of 1:200 to 1:5, preferably 1:150 to 1:10.

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

The rice seed can be used in direct seeding cultivation of rice by directly cultivating the rice seed in a paddy field. The so-called paddy field in the present invention refers to any one of the paddy field of the water and the paddy field of the water. Specifically, it is based on the "Iron-coated Zhanshui Live Handbook 2010" (Shan-Yi, the Independent Administrative Corporation Agricultural and Food Industry Technology Research Institute, near the China Four Agricultural Research Center, March 2010, Non-Patent Document 1 The method described is for sowing. In this case, a live broadcast machine for iron coating such as Tatsuo Jun (manufactured by Kubota Co., Ltd.) can be used. Thus, good seedling survival is achieved by seeding by the usual method. The rice can then be developed by maintaining the usual cultivation conditions.

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

[Examples]

The invention will be further illustrated by the examples.

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

In the following production examples and comparative production examples, unless otherwise indicated, rice seeds were made of seeds of Nikko Light, and iron oxide having an α-Fe ₂ O ₃ content of 78% and an average particle diameter of 42.7 μm was used. The manufacturing system was carried out at room temperature (about 20 ° C). Also, % means % by weight.

Further, the product names described in the production examples and the comparative production examples are as follows.

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

One type of zinc oxide: zinc oxide, manufactured by Nippon Chemical Industry Co., Ltd., average particle size; 0.26 μm

Two types of zinc oxide: zinc oxide, manufactured by Nippon Chemical Industry Co., Ltd., average particle size; 0.24 μm

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

SS#80: calcium carbonate, Nitto Powder Chemical Industry Co., Ltd., average particle size; 4.6μm

Calcium carbonate granules: calcium carbonate, medicinal lime co., Ltd., average particle size; 6.2 μm

Barite: barium sulfate, manufactured by Neoraito Industrial Co., Ltd., average particle size; 12.4 μm

Shengguangshan clay S: Shoushan Stone, Shengguangshan Mining Co., Ltd., average particle size; 6.7μm

Rutile flower: titanium oxide, made by Cordierite Matec Co., Ltd., average particle size; 14.6 μm

DL for clay powder: Shoushan Stone, Shengguangshan Mining Co., Ltd., average particle size; 30.3μm

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

DAE1K: iron powder, DOWA IPCreation system

KTS-1: Made of plaster, Yoshino Gypsum Trading Co., Ltd.

Amylox No.1A: a degree of swelling of α-starch and 2% aqueous suspension at 20 ° C; 16 mL/g, manufactured by Japan Corn Starch Co., Ltd.

The swelling degree of corn αY:α starch and 2% water suspension at 20°C; 19mL/g, manufactured by Sanhe Starch Industrial Co., Ltd.

Amycol W: a degree of swelling of α-starch and 2% aqueous suspension at 20 ° C; 6 mL/g, manufactured by Nippon Chemical Co., Ltd.

Amycol KF: a degree of swelling of α-starch and 2% aqueous suspension at 20 ° C; 45 mL/g, manufactured by Nippon Chemical Co., Ltd.

Manufacturing example 1

First, the rice seed used was used to make a coatable simple seed coating machine in a small amount. As shown in Fig. 1, a polyethylene cup 2 having a capacity of 500 mL was placed before the shaft 1, and the mixer was inserted into a drive shaft of a mixer 3 (Singapore, Shin-Etsu Scientific) to incline the mixer at an elevation angle of 45 degrees. 3 to install the bracket 4, and to make a simple seed coating machine.

Secondly, mixing 1 g of zinc oxide and 0.1 g of corn αY to obtain powder Composition (1). The powdery composition (1) had an average particle diameter of 141.3 μm and an apparent specific gravity of 0.35 g/mL.

About 100 mL of water was added to a polyethylene cup having a capacity of 200 mL, and 20 g of dried rice seeds were placed and soaked for 10 minutes. Then, the rice seeds were taken out from the water to remove excess water on the surface, and then placed in a polyethylene cup 2 mounted on a simple seed coating machine. By running a simple seed coating machine in the range of 130 to 140 rpm of the mixer 3, the rice seeds are rotated, and the water is sprayed on the rice seeds by spraying, and the powdery composition (1) 1.1 g is added. Approximately 4 (about 0.28 g), which was attached to rice seeds. When the powdery composition (1) adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to adhere a slight amount of the powdery composition (1) added once to the rice seed. Then, 1.1 g of the powdery composition (1) was adhered to rice seeds to form a coating layer by repeating the same operation three times. The total amount of water used for coating was 0.2 g. The rice seed (1) of the present invention was obtained by spreading the rice seeds taken out from the simple seed coating machine on a stainless steel rod in a non-overlapping manner and drying them overnight.

Manufacturing Example 2

10 g of zinc oxide 3N5 and 0.1 g of Amylox No. 1A were mixed to obtain a powdery composition (2). The powdery composition (2) had an average particle diameter of 6.16 μm and an apparent specific gravity of 0.54 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. Instead of the powdery composition (1) 1.1 g, the above powdery composition (2) 10.1 g was used instead. The rice seed (2) of the present invention was obtained by dividing into 4 parts for the addition operation. Further, the total amount of water used for coating was 2.8 g.

Manufacturing Example 3

10 g of zinc oxide 3N5 and 0.6 g of Amycol W were mixed to obtain a powdery composition (3). The powdery composition (3) had an average particle diameter of 8.77 μm and an apparent specific gravity of 0.54 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.6 g of the above-mentioned powdery composition (3) was used, and it was divided into 4 parts and added, and the coated rice seed (3) of the present invention was obtained. Further, the total amount of water used for coating was 2.8 g.

Manufacturing Example 4

Two kinds of ZnO oxide, 0.02 g, calcium carbonate G-100, 13.98 g, SS#80, 6 g, and Amycol W, 0.8 g were mixed to obtain a powdery composition (4). The powdery composition (4) had an average particle diameter of 48.5 μm and an apparent specific gravity of 1.1 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 20.8 g of the above-mentioned powdery composition (4) was used, and it was divided into 4 parts and added, and the coated rice seed (4) of the present invention was obtained. Moreover, the total amount of water used for coating was 3.6 g.

Manufacturing Example 5

Two kinds of zinc oxide, 0.1 g, calcium carbonate G-100, 6.9 g, SS#80, 3 g, and Amycol W, 0.8 g were mixed to obtain a powdery composition (5). Powder composition The average particle diameter of (5) was 37.4 μm, and the apparent specific gravity was 1.0 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.8 g of the above-mentioned powdery composition (5) was used, and this was divided into 4 parts and added, and the coated rice seed (5) of the present invention was obtained. Moreover, the total amount of water used for coating was 1.8 g.

Manufacturing Example 6

Two kinds of zinc oxide, 1 g, calcium carbonate G-100 13 g, SS #80 6 g, and Amycol W 0.8 g were mixed to obtain a powdery composition (6). The powdery composition (6) had an average particle diameter of 23.1 μm and an apparent specific gravity of 1.1 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 20.8 g of the above-mentioned powdery composition (6) was used, and it was divided into 4 parts and added, and the coated rice seed (6) of the present invention was obtained. Moreover, the total amount of water used for coating was 3.9 g.

Manufacturing Example 7

2.5 g of two kinds of zinc oxide, 7.5 g of calcium carbonate G-100 and 0.4 g of Amycol W were mixed to obtain a powdery composition (7). The powdery composition (7) had an average particle diameter of 27.0 μm and an apparent specific gravity of 0.95 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.4 g of the above-mentioned powdery composition (7) was used, and it was divided into 4 parts and added, and the coated rice seed (7) of the present invention was obtained. Further, the total amount of water used for coating was 2.0 g.

Manufacturing Example 8

5 g of zinc oxide 3N5, 5 g of calcium carbonate granules and 0.4 g of Amycol KF were mixed to obtain a powdery composition (8). The powdery composition (8) had an average particle diameter of 45.5 μm and an apparent specific gravity of 0.57 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.4 g of the above-mentioned powdery composition (8) was used, and it was divided into 4 parts and added, and the coated rice seed (8) of the present invention was obtained. Moreover, the total amount of water used for coating was 2.6 g.

Manufacturing Example 9

10 g of zinc oxide 3N5, 10 g of calcium carbonate granules and 0.8 g of Amylox No. 1A were mixed to obtain a powdery composition (9). The powdery composition (9) had an average particle diameter of 44.0 μm and an apparent specific gravity of 0.58 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 20.8 g of the above-mentioned powdery composition (9) was used, and it was divided into 4 parts and added, and the coated rice seed (9) of the present invention was obtained. Moreover, the total amount of water used for coating was 5.6 g.

Manufacturing Example 10

1 g of zinc oxide 3N5, 9 g of calcium carbonate granules, and 0.4 g of Amycol W were mixed to obtain a powdery composition (10). The powdery composition (10) had an average particle diameter of 9.9 μm and an apparent specific gravity of 0.61 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. Instead of the powdery composition (1) 1.1 g, the above powdery composition (10) was used in an amount of 10.4 g, and The rice seed (10) of the present invention was obtained by dividing into 4 portions for the addition operation. Moreover, the total amount of water used for coating was 1.7 g.

Manufacturing Example 11

3 g of zinc oxide 3N5, 1 g of barite, and 0.4 g of Amycol W were mixed to obtain a powdery composition (11). The powdery composition (11) had an average particle diameter of 9.2 μm and an apparent specific gravity of 1.00 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.4 g of the above-mentioned powdery composition (11) was used, and this was divided into 4 parts and added, and the coated rice seed (11) of the present invention was obtained. Moreover, the total amount of water used for coating was 2.5 g.

Manufacturing Example 12

A powdery composition (12) was obtained by mixing zinc oxide 3N5 9g, Shengguangshan clay S 1g and Amycol W 0.4g. The powdery composition (12) had an average particle diameter of 9.8 μm and an apparent specific gravity of 0.49 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.4 g of the above-mentioned powdery composition (12) was used, and this was divided into 4 parts and added, and the coated rice seed (12) of the present invention was obtained. Further, the total amount of water used for coating was 2.9 g.

Manufacturing Example 13

Two kinds of zinc oxide, 1 g, rutile 9 g, and Amycol W 0.4 g were mixed to obtain a powdery composition (13). Average particle size of the powdery composition (13) It was 15.5 μm and the apparent specific gravity was 1.08 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.4 g of the above-mentioned powdery composition (13) was used, and this was divided into 4 parts and added, and the coated rice seed (13) of the present invention was obtained. Further, the total amount of water used for coating was 1.2 g.

Manufacturing Example 14

1 g of zinc oxide was mixed, DL 9 g of clay powder and 0.4 g of Amycol W were used to obtain a powdery composition (14). The powdery composition (14) had an average particle diameter of 24.2 μm and an apparent specific gravity of 0.87 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.4 g of the above-mentioned powdery composition (14) was used, and it was divided into 4 parts and added, and the coated rice seed (14) of the present invention was obtained. Further, the total amount of water used for coating was 2.3 g.

Manufacturing Example 15

Two kinds of zinc oxide, 1 g, Sun Zeolite MGF 9 g, and Amycol W 0.4 g were mixed to obtain a powdery composition (15). The average particle diameter of the powdery composition (15) was 141.2 μm.

The following operations were carried out in accordance with the method described in Production Example 1. In place of the powdery composition (1) 1.1 g, 10.4 g of the above-mentioned powdery composition (15) was used, and it was divided into 4 parts and added, and the coated rice seed (15) of the present invention was obtained. Moreover, the total amount of water used for coating was 3.2 g.

Manufacturing Example 16

After mixing 70.0 parts by weight of cotinine and 30.0 parts by weight of Shengguangshan clay S, it was pulverized by a centrifugal pulverizer to obtain a powdery pesticide A. The average particle diameter of the powdery pesticide A obtained by wet measurement using Mastersizer 2000 (manufactured by Malvern) was 13.0 μm.

1 g of zinc oxide was mixed, 9 g of calcium carbonate granules, 0.4 g of Amycol W, and 0.086 g of powdery pesticide A were obtained to obtain a powdery composition (16). The powdery composition (16) had an average particle diameter of 9.1 μm and an apparent specific gravity of 0.57 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. Instead of the powdery composition (1) 1.1 g, the above-mentioned powdery composition (16) 10.486 g was used, and it was divided into 4 parts and added to obtain the coated rice seed (16) of the present invention. Moreover, the total amount of water used for coating was 1.9 g.

Manufacturing Example 17

The mixed granules were obtained by using 9 g of calcium carbonate and 0.36 g of Amycol W to obtain a powdery composition (17-1). The powdery composition (17-1) had an average particle diameter of 8.57 μm and an apparent specific gravity of 0.63 g/mL.

Further, 1 g of zinc oxide 3N5 and 0.04 g of Amycol W were mixed to obtain a powdery composition (17-2). The powdery composition (17-2) had an average particle diameter of 5.6 μm and an apparent specific gravity of 0.54 g/mL.

The coating was carried out in accordance with the method described in Production Example 1. After soaking and drying 20g of rice seeds, use a simple seed coating machine to rotate it to spray Water was sprayed on the rice seeds, and an amount (about 2.3 g) of about 1/4 of 9.36 g of the powdery composition (17-1) was added to adhere to the rice seeds. When the powdery composition (17-1) is attached to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to attach a slight amount of the powdery composition (17-1) once added to the rice. seed. Then, by repeating the same operation three times, 9.36 g of the powdery composition (17-1) was adhered to rice seeds to form a first coating layer (hereinafter referred to as a first layer) containing calcium carbonate. The total amount of water used for coating was 1.9 g.

Secondly, it is directly carried out by operating the simple seed coating machine to maintain the rotation state of the rice seeds, spraying the water on the rice seeds with a spray, and adding about 1/4 of the 1.04 g of the powdery composition (17-2). The amount (about 0.26 g) was allowed to adhere to the outside of the first layer. When the powdery composition (17-2) adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to attach a slight amount of the powdery composition (17-2) once added to the rice. seed.

Then, by repeating the same operation three times, 1.04 g of the powdery composition (17-2) was adhered to the outside of the first layer, and a second coating layer containing zinc oxide was formed on the outer side of the first layer ( The following is recorded as the second layer). The total amount of water used for coating was 1.3 g.

The coated rice seeds (17) of the present invention were obtained by spreading the rice seeds taken out from the simple seed coating machine in a non-overlapping manner in a stainless steel rod and drying them overnight.

Manufacturing Example 18

Next, 1 g of zinc oxide 3N5, 9 g of iron oxide, and 0.05 g of Amylox No. 1A were mixed to obtain a powdery composition (18). The powdery composition (18) had an average particle diameter of 58.6 μm and an apparent specific gravity of 1.63 g/mL.

About 100 mL of water was added to a polyethylene cup having a capacity of 200 mL, and 20 g of dried rice seeds were placed and soaked for 10 minutes. Then, the rice seeds were taken out from the water to remove excess water on the surface, and then placed in a polyethylene cup 2 mounted on a simple seed coating machine. By running a simple seed coating machine in the range of 130 to 140 rpm of the mixer 3, the rice seeds are rotated, and the water is sprayed on the rice seeds by spraying, and the powdery composition (18) is added 1/1 kg of 10.05 g. Approximately 4 (about 2.5 g), which is attached to rice seeds. When the powdery composition (18) adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to adhere a slight amount of the powdery composition (18) added once to the rice seed. Then, by repeating the same operation three times, 10.05 g of the powdery composition (18) was attached to rice seeds to form a coating layer. The total amount of water used for coating was 0.7 g. The rice seed (18) of the present invention was obtained by drying the rice seeds taken out from the simple seed coating machine in a non-overlapping manner and drying them overnight.

Manufacturing Example 19

5 g of zinc oxide 3N5, 5 g of iron oxide, and 0.1 g of Amylox No. 1A were mixed to obtain a powdery composition (19). The powdery composition (19) had an average particle diameter of 19.0 μm and an apparent specific gravity of 0.97 g/mL.

The coating was carried out in accordance with the method described in Production Example 18. Replace the powder group The resultant (18) 10.05 g was changed to 10.1 g of the above-mentioned powdery composition (19), and it was divided into 4 parts and added to obtain the coated rice seed (19) of the present invention. Moreover, the total amount of water used for coating was 2.1 g.

Manufacturing Example 20

A powdery composition (20) was obtained by mixing zinc oxide 3N5 9g, iron oxide 1g, and Amylox No. 1A 0.1. The powdery composition (20) had an average particle diameter of 13.4 μm and an apparent specific gravity of 0.63 g/mL.

The coating was carried out in accordance with the method described in Production Example 18. Instead of the powdery composition (18), 10.05 g, the above powdery composition (20) was used in an amount of 10.1 g, and the mixture was divided into 4 portions to carry out an operation to obtain the coated rice seed (20) of the present invention. Further, the total amount of water used for coating was 2.8 g.

Manufacturing Example 21

Two kinds of zinc oxide, 2 g of iron oxide, 18 g of iron oxide, and 0.8 g of Amycol W were mixed to obtain a powdery composition (21). The powdery composition (21) had an average particle diameter of 14.0 μm and an apparent specific gravity of 1.7 g/mL.

The coating was carried out in accordance with the method described in Production Example 18. In place of the powdery composition (18), 10.05 g, 20.8 g of the above-mentioned powdery composition (21) was used, and it was divided into 4 parts and added, and the coated rice seed (21) of the present invention was obtained. Further, the total amount of water used for coating was 2.9 g.

Manufacturing Example 22

2.5 g of two kinds of zinc oxide, 7.5 g of iron oxide, and 0.4 g of Amycol W were mixed to obtain a powdery composition (22). The powdery composition (22) had an average particle diameter of 3.6 μm and an apparent specific gravity of 1.3 g/mL.

The coating was carried out in accordance with the method described in Production Example 18. Instead of the powdery composition (18), 10.05 g, the above-mentioned powdery composition (22) was used in an amount of 10.4 g, and the mixture was divided into 4 portions to carry out an operation to obtain the coated rice seed (22) of the present invention. Moreover, the total amount of water used for coating was 1.7 g.

Production Example 23

Two kinds of zinc oxide, 2.5 g, iron oxide 7.5 g, and Amycol KF 0.1 g were mixed to obtain a powdery composition (23). The powdery composition (23) had an average particle diameter of 22.0 μm and an apparent specific gravity of 1.02 g/mL.

The coating was carried out in accordance with the method described in Production Example 18. Instead of the powdery composition (18), 10.05 g, the above powdery composition (23) was used in an amount of 10.1 g, and the mixture was divided into 4 portions to carry out an operation to obtain the coated rice seed (23) of the present invention. Moreover, the total amount of water used for coating was 1.9 g.

Manufacturing Example 24

After mixing 70.0 parts by weight of cotinine and 30.0 parts by weight of Shengguangshan clay S, it was pulverized by a centrifugal pulverizer to obtain a powdery pesticide B. Make The average particle diameter of the powdery pesticide B obtained by wet measurement using a Mastersizer 2000 (manufactured by Malvern) was 13.0 μm.

2.5 g of two kinds of zinc oxide, 7.5 g of iron oxide, 0.4 g of Amycol W, and 0.086 g of powdery pesticide B were mixed to obtain a powdery composition (24). The powdery composition (24) had an average particle diameter of 5.3 μm and an apparent specific gravity of 0.98 g/mL.

The coating was carried out in accordance with the method described in Production Example 18. Instead of the powdery composition (18), 10.05 g, the above-mentioned powdery composition (24) 10.486 g was used, and it was divided into 4 parts and added, and the coated rice seed (24) of the present invention was obtained. Further, the total amount of water used for coating was 2.0 g.

Manufacturing Example 25

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

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

The coating was carried out in accordance with the method described in Production Example 18. After soaking and drying 20 g of rice seeds, it was rotated by a simple seed coating machine, and water was sprayed on the rice seeds while spraying, while adding about 1/4 of a powder composition (25-1) of 9.045 g (about 2.3). g), while making it attached to rice seeds. When the powdery composition (25-1) adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to attach a slight amount of the powdery composition (25-1) once added to the rice. seed. Then, by repeating the same operation three times, 9.045 g of the powdery composition (25-1) was attached to the rice seed to make it A first coating layer (hereinafter referred to as a first coating layer) containing iron oxide is formed. The total amount of water used for coating was 1.0 g.

Secondly, it is directly carried out by operating the simple seed coating machine to maintain the rotation state of the rice seeds, spraying water on the rice seeds by spraying, and adding about 1/4 of the 1.005 g of the powdery composition (25-2). The amount (about 0.25 g) was allowed to adhere to the outside of the first coating layer. When the powdery composition (25-2) adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to attach a slight amount of the powdery composition (25-2) once added to the rice. seed. Then, by repeating the same operation three times, 1.005 g of the powdery composition (25-2) was adhered to the outside of the first layer, and a second coating containing zinc oxide was formed on the outer side of the first coating layer. The coating (hereinafter referred to as a second coating layer). The total amount of water used for coating was 2.1 g.

The coated rice seeds (25) of the present invention were obtained by spreading the rice seeds taken out from the simple seed coating machine in a non-overlapping manner in a stainless steel rod and drying them overnight.

Manufacturing Example 26

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

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

The coating was carried out in accordance with the method described in Production Example 18. After soaking and drying 20 g of rice seeds, the machine was rotated using a simple seed coating machine, and water was sprayed on the rice seeds with a spray while adding a powdery composition (26-1) 1.01 g. The amount of about 1/4 (about 0.25 g) is attached to rice seeds. When the powdery composition (26-1) adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to attach a slight amount of the powdery composition (26-1) once added to the rice. seed. Then, by repeating the same operation three times, 1.01 g of the powdery composition (26-1) was adhered to rice seeds to form a first coating layer. The total amount of water used for coating was 0.2 g.

Secondly, it is carried out directly by the operation of the simple seed coating machine, maintaining the rotation state of the rice seeds, spraying the water on the rice seeds with a spray, and adding about 1/4 of the 9.09 g of the powdery composition (26-2). The amount (about 2.3 g) was allowed to adhere to the outside of the first coating layer. When the powdery composition (26-2) adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to attach a slight amount of the powdery composition (26-2) once added to the rice. seed. Then, by repeating the same operation three times, 9.09 g of the powdery composition (26-2) was attached to the outside of the first coating layer to form a second coating layer on the outer side of the first coating layer. . The total amount of water used for coating was 3.4 g.

The coated rice seeds (26) of the present invention were obtained by drying the rice seeds taken out from the simple seed coating machine in a non-overlapping manner in a stainless steel rod and drying them overnight.

Comparative manufacturing example 1

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

The coating was carried out in accordance with the method described in Production Example 1. Soaking and drying rice After 20 g of the seed, the machine was rotated using a simple seed coating machine, and water was sprayed on the rice seed using a pipette, and an amount of about 1/4 of the iron mixture A (about 2.8 g) was added thereto to adhere it to the rice. seed. When the iron mixture A adheres to the inner wall of the polyethylene cup 2, it can be scraped off with a spatula to adhere a slight total amount of the iron mixture A once added to the rice seed. Then, by repeating the same operation three times, the iron mixture A 11g was attached to the rice seed to form a coating layer. The total amount of water used for coating was 1.9 g. Next, the operation of the simple seed coating machine was carried out directly, and the rotation state of the rice seeds was maintained, and 0.5 g of KTS-1 was placed to adhere to the outside of the coating layer. The rice seeds taken out from the simple seed coating machine are spread in a non-overlapping manner in a stainless steel rod, and in order to promote the oxidation of iron, the operation of spraying the rice seeds on the rice three times a day is carried out for 2 days, and then by It was dried to obtain a comparative coated rice seed (I).

Next, a test example is shown.

Test example 1

After placing about 30 g of the soil in a plastic petri dish and moistening it with water, 50 grains of the coated rice seeds were sown on the soil surface. The plastic petri dish was allowed to stand outside the house, and the plastic petri dish was observed by time-lapse photography, and the coated rice seeds remaining after one day of seeding were counted, and the residual rate was calculated by the following formula.

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

The results are shown in Table 1. Still, the so-called rice seeds in Table 1 (right Photo) refers to uncoated rice seeds which have a residual rate of 0% due to eating by birds such as sparrows.

Test example 2

The plastic petri dish was moistened with water and coated with gauze, and 50 seeds of rice seeds were spread thereon. The plastic petri dish was covered with a lid, and left to stand in a thermostat set at 17 ° C. The presence or absence of germination was examined 10 days later, and the germination rate was calculated by the following formula.

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

The results are shown in Table 2.

Test Example 3

Ten rice coated seeds were placed in a petri dish containing 3 mL of hard water and 50 mL, and allowed to stand at room temperature (about 20 ° C). The presence or absence of peeling of the coating was visually observed after 30 minutes.

The results are shown in Table 3.

Test Example 4

After placing about 30 g of the soil in a plastic petri dish and moistening it with water, 50 grains of the coated rice seeds were sown on the soil surface. The plastic petri dish was allowed to stand outside the house, and the plastic petri dish was observed by time-lapse photography, and the coated rice seeds remaining after one day of seeding were counted, and the residual rate was calculated by the following formula.

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

The results are shown in Table 4. Further, the rice seed (control) in Table 4 refers to the uncoated rice seed which has a residual rate of 0% due to eating due to birds such as sparrows.

Test Example 5

The plastic petri dish was moistened with water and coated with gauze, and 50 seeds of rice seeds were spread thereon. The plastic petri dish was covered with a lid, and left to stand in a thermostat set at 17 ° C. The presence or absence of germination was examined 10 days later, and the germination rate was calculated by the following formula.

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

The results are shown in Table 5.

Test Example 6

Ten rice coated seeds were placed in a petri dish containing 3 mL of hard water and 50 mL, and allowed to stand at room temperature (about 20 ° C). The presence or absence of peeling of the coating was visually observed after 30 minutes.

The results are shown in Table 6.

Claims (21)

The invention relates to a coated rice seed which is coated with rice coated with a coating layer, wherein the coating layer comprises α-starch in a range of 10% to 48 mL/g of a swelling solution of 2% water suspension at 20° C. With zinc oxide. The coated rice seed according to claim 1, wherein the coating layer comprises at least one selected from the group consisting of: (A): barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate. The group formed. The coated rice seed according to claim 2, wherein the coating layer has a first layer containing at least one selected from the group (A) and a zinc oxide containing the outer side disposed on the outer side of the first layer. The second layer is made. The coated rice seed of claim 1 or 2, wherein the coating layer further comprises iron oxide. The coated rice seed according to claim 4, wherein the coating layer has a first layer containing iron oxide and a second layer containing zinc oxide disposed outside the first layer. A powdery composition comprising α-starch and zinc oxide in a range of 10% to 48 mL/g of swelling of 2% aqueous suspension at 20 °C. The powdery composition of claim 6, which is selected from at least one of the following group (A): group (A): a group consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate. The powdery composition of claim 6 or 7, wherein the average particle diameter is in the range of 0.01 to 150 μm. The powdery composition according to any one of claims 6 to 8, wherein the apparent specific gravity is in the range of 0.30 to 2.50 g/mL. The powdery composition according to any one of claims 6 to 8, wherein the apparent specific gravity is in the range of 0.30 to 2.0 g/mL. The powdery composition according to any one of claims 6 to 10, which further contains iron oxide. The powdery composition according to any one of claims 6 to 11, wherein the zinc oxide has an average particle diameter of 0.01 to 100 μm. A kit for coating rice seeds, which comprises α-starch and zinc oxide in a range of 10% to 48 mL/g of swelling of 2% aqueous suspension at 20 °C. The kit of claim 13 further comprising iron oxide. The kit of claim 13 or 14, which has at least one selected from the group consisting of: (A): consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate. Group. A method for producing a coated rice seed having the following steps, (1) adding a 2% aqueous suspension to a starch having a swelling degree of 20 to 48 mL/g at 20 ° C while rotating the rice seed, and The zinc oxide and at least one selected from the group (A) below and water form a coating layer containing the α-starch, zinc oxide, and at least one selected from the group (A) below. a step, and (2) a step of drying the seed obtained in the above step (1), Group (A): a group consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate. A method for producing a coated rice seed having the following steps, (1) (I) while rotating the rice seed, adding a 2% aqueous suspension at a swelling degree of 20 to 48 mL/g at 20 ° C And a step of forming a coating layer comprising at least one selected from the group consisting of the following group (A) and at least one selected from the group consisting of the above-mentioned α-starch and at least one selected from the group (A) below, and (II) While rotating the seed obtained in the above step (I), adding the aforementioned α-starch, zinc oxide, and water, forming the above-mentioned α-starch and zinc oxide coated on the outer side of the layer formed in the above step (I) a step of coating, and (2) a step of drying the seed obtained in the above step (1), group (A): a group consisting of barium sulfate, titanium oxide, clay, zeolite, and calcium carbonate. A coated rice seed obtained by the production method of claim 17 or 18. A method for producing a coated rice seed having the following steps, (1) adding a 2% aqueous suspension to a starch having a swelling degree of 20 to 48 mL/g at 20 ° C while rotating the rice seed, and The step of forming a coating layer containing the aforementioned α-starch, zinc oxide, and iron oxide with zinc oxide, iron oxide, and water, and (2) drying the seed obtained in the above step (1). A method for producing a coated rice seed having the following steps, (1) (I) adding a 2% aqueous suspension while rotating the rice seed a step of forming a coating layer containing the α-starch and iron oxide in the range of 10 to 48 mL/g in a degree of swelling at 20 ° C, a step of forming a coating layer containing the above-mentioned α-starch and iron oxide, and (II) (I) a step of forming the coating layer containing the α-starch and the zinc oxide on the outer side of the layer formed in the step (I) while adding the α-starch, the zinc oxide, and the water while the obtained seed is rotated. (2) a step of drying the seed obtained in the above step (1). A rice seed coated by the production method of claim 20 or 21.