KR102611584B1 - Coated rice seed and method for producing same - Google Patents

Abstract

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

Description

Coated rice seeds and method for producing the same {COATED RICE SEED AND METHOD FOR PRODUCING SAME}

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

Direct seeding of paddy rice refers to a cultivation method by sowing rice seeds directly into the paddy field, and this method has the advantage of easing farming because it does not require some seedling and transplant work. On the other hand, this method has the disadvantage of being vulnerable to deliquescence by birds such as ducks and sparrows. A decrease in seedling establishment rate due to deliquescence leads to a decrease in yield, so a strategy to avoid deliquescence is required. As a conventional strategy to avoid deliquescence, deliquescence prevention methods using, for example, water management have been proposed. However, this method requires modification of the management system depending on the type of bird (see, for example, Non-Patent Document 1).

Additionally, iron-coated flooding direct sowing is known as a technological method to prevent predation by sparrows by coating rice seeds with iron powder to suppress seed suspension in soil-surface sowing (e.g. For example, see Non-Patent Document 2). However, since the technological method utilizes the solidification of iron powder due to oxidation of iron, there are some inconveniences in the management of coated rice seeds, such as the need to release the heat generated by oxidation, and the management is difficult. If it is not sufficient, there are some problems such as reduced germination rate. A solution to solve this problem is known as a method of coating rice seeds with polyvinyl alcohol having a high degree of saponification and a coating material such as iron oxide (see Patent Document 1).

Citation List

patent literature

Patent Document 1: JP 2013-146266 A1

non-patent literature

Non-patent Document 1: Nagao SAKAI et al., “Prevention of bird damage in the flowed paddy rice direct sowing cultivation”, The Hokuriku Crop Science, the Crop Science Society of Japan, March 31, 1999, Vol. 34, p.59-61

Non-patent Document 2: Minoru YAMAUCHI, "A manual for direct sowing of iron-coated rice on a flooded paddy field 2010", The National Agriculture and Food Research Organization, Western Region Agricultural Research Center, March 2010.

However, the effect of preventing deliquescence by iron oxide-coated rice seeds is not sufficient.

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

The present inventors conducted extensive research and discovered the above-mentioned coated rice seeds, and as a result, rice seeds coated with polyvinyl alcohol, zinc oxide, bentonite, and surfactant having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%. It was found that sowing in rice fields ensures a sufficient seedling establishment rate in direct seeding cultivation of paddy rice due to reduced deliquescence.

The present invention is as follows.

[1] Coated rice seeds having a coating layer, wherein the coating layer contains polyvinyl alcohol, zinc oxide, bentonite, and a surfactant having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%. .

[2] Coated rice seeds having a coating layer, wherein the coating layer contains polyvinyl alcohol, zinc oxide, and bentonite having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%, and the surfactant is at least coated. Coated rice seeds retained on the surface of the rice seeds.

[3] The coated rice seed according to [1] or [2], wherein the coating layer contains at least one selected from the following group (A);

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

[4] The coated rice seed according to [3], wherein the coating layer has a first layer containing at least one selected from group (A) and a second layer containing zinc oxide coated on the outside of the first layer.

[5] The coated rice seed according to any one of [1] to [3], wherein the coating layer further contains iron oxide.

[6] The coated rice seed according to [5], wherein the coating layer has a first layer containing iron oxide and a second layer containing zinc oxide coated on the outside of the first layer.

[7] A powdered composition containing polyvinyl alcohol, zinc oxide, and bentonite having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%.

[8] The powdered composition according to [7], containing at least one selected from the following group (A);

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

[9] The powdered composition according to [7] or [8], wherein the average particle size is in the range of 0.01 to 150 μm.

[10] The powdered composition according to any one of [7] to [9], wherein the apparent relative density is in the range of 0.30 to 2.50 g/mL.

[11] The powdered composition according to any one of [7] to [9], wherein the apparent relative density is in the range of 0.30 to 2.0 g/mL.

[12] The powdered composition according to any one of [7] to [11], further containing iron oxide.

[13] The powdered composition according to any one of [7] to [12], wherein the average particle size of the zinc oxide is in the range of 0.01 to 100 μm.

[14] A kit for the production of coated rice seeds with polyvinyl alcohol, zinc oxide, bentonite, and a surfactant having a degree of polymerization of at least 500 and a degree of saponification in the range of 71.0 to 97.5 mol%.

[15] The kit according to [14], further comprising iron oxide.

[16] The kit according to [14] or [15], comprising at least one selected from the following group (A);

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

[17] Method for producing coated rice seeds, comprising the following steps:

(1) While rolling the rice seeds, polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%, zinc oxide, bentonite, at least one selected from the group (A) below, and water are added to produce poly. forming a coating layer containing vinyl alcohol, zinc oxide, bentonite, and at least one selected from the group (A) below,

(2) adding a surfactant while moving and rolling the seed obtained in step (1) to retain the surfactant outside the layer formed by step (1), and

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

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

[18] Method for producing coated rice seeds, comprising the following steps:

(1) (I) Polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%, bentonite, at least one selected from the group (A) below, and water are added while rolling the rice seeds to form polyvinyl alcohol. forming a coating layer containing alcohol, bentonite, and at least one selected from the group (A) below, and (II) moving and rolling the seeds obtained in step (I) while mixing polyvinyl alcohol, zinc oxide, bentonite, and adding water to form a coating layer containing polyvinyl alcohol, zinc oxide, and bentonite outside the layer formed by step (I);

(2) adding a surfactant while moving and rolling the seed obtained in step (1) to retain the surfactant outside the layer formed by step (1), and

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

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

[19] Coated rice seeds produced by the method according to [17] or [18].

[20] Method for producing coated rice seeds, comprising the following steps:

(1) While moving and rolling the rice seeds, polyvinyl alcohol, zinc oxide, iron oxide, bentonite, and water having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol% are added to form polyvinyl alcohol, zinc oxide, forming a coating layer containing iron oxide and bentonite,

(2) adding a surfactant while moving and rolling the seed obtained in step (1) to retain the surfactant outside the layer formed by step (1), and

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

[21] Method for producing coated rice seeds, comprising the following steps:

(1) (i) Polyvinyl alcohol, iron oxide, bentonite, and water having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol% are added while moving and rolling the rice seeds to form polyvinyl alcohol, iron oxide, and forming a coating layer containing bentonite, and (ii) adding polyvinyl alcohol, zinc oxide, bentonite, and water to the outside of the layer formed by step (I) while moving and rolling the seeds obtained in step (i). forming a coating layer containing polyvinyl alcohol, zinc oxide, and bentonite;

(2) adding a surfactant while moving and rolling the seed obtained in step (1) to retain the surfactant outside the layer formed by step (1), and

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

[22] Coated rice seeds produced by the method according to [20] or [21].

The coated rice seeds of the present invention are less sensitive to deliquescence, prevent seed floating and a decrease in germination rate, as well as ensure a sufficient seedling composition rate in direct sowing cultivation of paddy rice.

[Figure 1] Illustration of a simple seed coater used for coating rice seeds in the example.

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

Rice seeds as used herein refer to seeds of commonly cultivated rice varieties.

Examples of cultivars include species such as Japonica subspecies and Indica subspecies, and cultivars with high lodging resistance and high germination rates are preferred.

As used herein, the present PVA refers to a polymer compound having a structure represented by the following formula (1), where the degree of polymerization is 500 or more and the degree of saponification is in the range of 71.0 to 97.5 mol%.

In the formula (1), m + n represents the degree of polymerization, and {m / (m + n)} x 100 (mol%) represents the degree of saponification. The degree of polymerization of polyvinyl alcohol as used herein means the average degree of polymerization measured by calculation according to the test method for polyvinyl alcohol specified in JIS K6726-1994, and the degree of polymerization of the present PVA is preferably 500 to 3000, More preferably, it is in the range of 1000 to 2500, and even more preferably in the range of 1500 to 2500. As used herein, the degree of saponification of polyvinyl alcohol means the degree of saponification measured by calculating according to the test method for polyvinyl alcohol specified in JIS K6726-1994, and the degree of saponification of the present PVA is preferably 78.5 to 78.5. 97.5 mol%, more preferably within the range of 86.5 to 97.5 mol%. This PVA is commercially available, examples of commercially available PVA include KURARAY POVAL PVA-220S (degree of polymerization; 2000, degree of saponification; 87.0 to 89.0 mol%, manufactured by KURARAY CO., LTD.), KURARAY POVAL PVA-205S (degree of polymerization; 500, Degree of saponification; 86.5 to 89.0 mol%, manufactured by KURARAY CO., LTD.), and GOHSENOL GM-14S (degree of polymerization; 1000 to 1500, degree of saponification; 86.5 to 89.0 mol%, manufactured by The Nippon Synthetic Chemical Industry Co., Ltd.). ) includes.

Powdered polyvinyl alcohol as used herein is preferably used, and polyvinyl alcohol with a particle size distribution such that the content of particles with a size of 180 μm or more is 0.5% or less. As used herein, “particle size distribution of polyvinyl alcohol” means the particle size distribution measured using the sieving method, and as used herein, “the content of particles with a size of 180 μm or more is 0.5 “Having a particle size distribution of % or less” indicates that the weight ratio of the amount remaining in the 180 μm aperture sieve to the total amount is 0.5% or less. The particle size distribution of polyvinyl alcohol is 10 g of polyvinyl on a 180 μm aperture sieve (a test sieve defined by Japanese Industrial Standards (JIS) Z8801-1, the frame of which has a diameter of 200 mm and a depth of 45 mm). After placing the alcohol and sieving the polyvinyl alcohol for 10 minutes with a sieving device such as a ro-tap shaker, the weight of polyvinyl alcohol remaining on the sieve is weighed and the particle size is calculated according to the equation below: It can be obtained by calculating the distribution.

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

The content of PVA in the rice seeds is usually in the range of 0.01 to 5 wt%, preferably 0.01 to 3 wt%, and more preferably 0.1 to 2 wt%.

Zinc oxide as used herein refers to the compound represented by ZnO, which may be commercially available zinc oxide. Examples of commercially available zinc oxides include Zinc Oxide 3N5 (manufactured by KANTO CHEMICAL CO., INC.) and Zinc Oxide Grade 2 (manufactured by NIPPON CHEMICAL INDUSTRIAL CO., LTD.). Zinc oxide as used herein preferably has a purity (wt% relative to said zinc oxide) of at least 99%. The purity of zinc oxide is measured by the test procedure specified in K1410 of the Japanese Industrial Standards (JIS). Additionally, powdered zinc oxide is commonly used, the average particle size of zinc oxide being in the range of 0.01 to 100 μm, preferably 0.1 to 50 μm, more preferably 0.1 to 10 μm. The average particle size of zinc oxide as used herein refers to the particle size measured with a laser diffraction/scattering type particle size distribution analyzer, which is defined as the particle size corresponding to 50% accumulation in a volume-based frequency distribution. The average particle size of zinc oxide can be measured by dispersing particles of zinc oxide in water and measuring them with a laser diffraction/scattering type particle size distribution analyzer, Mastersizer 2000 (manufacturer Malvern Instruments Ltd), i.e. wetting method. You can.

The content of zinc oxide in the rice seeds is usually in the range of 0.005 to 80 wt%, preferably 0.05 to 70 wt%, and more preferably 0.1 to 50 wt%. From the viewpoint of plant growth and impact on the environment, a range of 0.1 to 15 wt% is preferred.

Bentonite, as used herein, refers to a clay composed primarily of sodium bentonite, which contains sodium ions as the dominant cation in the middle layer of montmorillonite, and calcium bentonite, which contains calcium ions as the dominant cation in the middle layer of montmorillonite. Bentonites are commercially available, and examples of commercially available bentonites include bentonites HOTAKA (manufactured by HOJUN Co., Ltd.) and KUNIGEL V1 (manufactured by KUNIMINE INDUSTRIES CO., LTD.). Powdered bentonite as used herein is preferably used, and bentonite with a particle size distribution of 20% or less in the content of particles with a size of 75 μm or more is preferably used. As used herein, “particle size distribution of bentonite” means a particle size distribution measured using the sieving method, and as used herein, “particle size distribution with a content of 20% or less of particles having a size of 75 μm or larger. "Having" indicates that the weight ratio of the amount remaining on the 75 μm aperture sieve to the total amount is 20% or less. The particle size distribution of bentonite is placed on a 75 μm aperture sieve (a test sieve defined by Japanese Industrial Standards (JIS) Z8801-1, the frame of which has a diameter of 200 mm and a depth of 45 mm). It can be obtained by sieving the bentonite with a sieving device, such as a low-tap shaker, for 10 minutes, then weighing the weight of the bentonite remaining on the sieve, and calculating the particle size distribution according to the following equation.

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

The content of bentonite in this rice seed is usually in the range of 0.01 to 10 wt%, preferably 0.05 to 5 wt%, and more preferably 0.1 to 3 wt%.

Surfactants as used herein are preferably one or more selected from the group consisting of nonionic surfactants and anionic surfactants, more preferably polyoxyethylene alkyl ethers, polyoxyethylene aryl phenyl ethers, and sulfonates. It is one or more selected from the group consisting of. Additionally, the polyoxyethylene aryl phenyl ether is preferably polyoxyethylene polystyryl phenyl ether, and the sulfonate is preferably naphthalenesulfonate and formaldehyde condensate thereof, phenolsulfonate and formaldehyde condensate thereof, and rig. It is at least one selected from the group consisting of nosulfonates.

Polyoxyethylene alkyl ethers include polyoxyethylene stearyl ether and polyoxyethylene tridodecyl ether. Polyoxyethylene polystyryl phenyl ether includes polyoxyethylene tristyrylphenyl ether. Naphthalene sulfonate and formaldehyde condensate thereof include formaldehyde condensate of sodium naphthalene sulfonate, phenol sulfonate and formaldehyde condensate thereof include formaldehyde condensate of sodium phenol sulfonate, and lignosulfonate. includes sodium lignosulfonate. Surfactants are commercially available, for example, commercially available polyoxyethylene tristyrylphenyl ether includes SORPOL5080 (manufacturer TOHO Chemical Industry Co., Ltd.), and commercially available formaldehyde condensate of sodium naphthalenesulfonate is NEWKALGEN PS-P. (TAKEMOTO OIL & FAT Co., Ltd.).

Powdered surfactants as used herein are preferably used, and surfactants having a particle size distribution of less than 2% of particles with a size of 100 μm or more are preferably used. As used herein, “particle size distribution of a surfactant” means a particle size distribution measured using the sieving method, and as used herein, “particle size with a content of particles having a size of 100 μm or more of 2% or less. “Having a distribution” indicates that the weight ratio of the remaining amount on the 100 μm aperture sieve to the total amount is 2% or less. The particle size distribution of the surfactant is 10 g of surfactant on a 100 μm aperture sieve (a test sieve defined by Japanese Industrial Standards (JIS) Z8801-1, the frame of which has a diameter of 200 mm and a depth of 45 mm). It can be obtained by sieving the surfactant for 10 minutes with a sieving device, such as a low-tab shaker, then weighing the weight of the surfactant remaining on the sieve, and calculating the particle size distribution according to the equation below.

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

The content of surfactant in this rice seed is usually in the range of 0.002 to 6 wt%, preferably 0.005 to 2 wt%, and more preferably 0.01 to 2 wt%.

The coating layer may contain one or more selected from group (A) (hereinafter referred to as “the present inorganic compound”). Among these inorganic compounds, clay includes pyrophyllite and kaolin. Additionally, the inorganic compound is preferably at least one selected from the group consisting of clay and calcium carbonate, with calcium carbonate being particularly preferred due to its good adhesion to rice seeds.

Powdered inorganic compounds as used herein are preferably used, the average particle size of which is usually less than 200 μm, preferably less than 150 μm. As used herein, the average particle size of the present inorganic compounds refers to the particle size measured with a laser diffraction/scattering type particle size distribution analyzer, which is defined as the particle size corresponding to 50% accumulation in a volume-based frequency distribution. The average particle size of the present inorganic compound can be measured by dispersing the particles of the present inorganic compound in water and then measuring them with a laser diffraction/scattering type particle size distribution analyzer, Mastersizer 2000 (manufacturer Malvern Instruments Ltd), i.e. the wet measurement method. You can.

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

When the coating layer contains the present inorganic compound, its content in the present rice seeds is usually in the range of 0.5 to 80 wt%, preferably 1 to 70 wt%, more preferably 5 to 50 wt%.

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

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

Examples of fungicidal active ingredients include isotianil and furametpyr.

Examples of herbicidal active ingredients include imazosulfuron and bromobutide.

Examples of plant growth regulator active ingredients include uniconazole P.

Powdered insecticidal active ingredients as used herein are preferably used and can be optionally mixed with the present inorganic compounds and milled in a mill such as a dry mill to be used as a powdered insecticide. The average particle size of the powdered pesticide is usually 200 μm or less, preferably 150 μm or less. As used herein, average particle size of a powdered pesticide refers to the particle size measured by a laser diffraction/scattering type particle size distribution analyzer, which is defined as the particle size corresponding to 50% accumulation in a volume-based frequency distribution. . When the powdered pesticide is mixed with the present inorganic compound, the average particle size of the powdered pesticide means the average particle size of the mixture. The average particle size of the powdered pesticide can be measured by dispersing the particles of the powdered pesticide in water and then measuring them with a laser diffraction/scattering type particle size distribution analyzer, Mastersizer 2000 (manufacturer Malvern Instruments Ltd), that is, the wet measurement method. You can.

When the coating layer contains an insecticidally active ingredient, its content in the present rice seeds is usually in the range of 0.001 to 3 wt%, preferably 0.005 to 2 wt%, more preferably 0.01 to 2 wt%.

The coating layer may contain a colorant. Examples of colorants include pigments, dyes, and dye products, with pigments being particularly preferred. The pigment is preferably a red or blue pigment, such as ultramarine blue Nubix G-58 (blue pigment, manufactured by nubiola Inc.) and TODA COLOR-300R (red pigment, manufactured by TODA KOGYO CORP.).

The components used in the production of the present rice seeds may be used separately, or two or more or all of the components may be used in combination. The kit of the present invention (hereinafter referred to as “the kit”) has the present PVA, zinc oxide, bentonite, and surfactant, which may be contained in one container, or may be contained in two or more containers. there is. That is, this kit may include one or more container(s). If the kit includes two or more containers, each container may contain separate ingredients. Additionally, the kit may include other components, such as iron oxide, the present inorganic compound, and insecticidal active ingredients (hereinafter referred to as “component α”).

The present rice seeds have a coating layer (hereinafter referred to as “main coating layer 1”) on the rice seeds, which contains PVA, zinc oxide, bentonite, and a surfactant, and optionally contains iron oxide or the present inorganic compound. or after forming a layer containing the present PVA, zinc oxide, and bentonite, and optionally containing iron oxide or the present inorganic compound (hereinafter referred to as “present coating layer 2”) on the rice seed, This coating layer 2 can be prepared by retaining a surfactant on the surface.

The present coating layer 1 is formed by performing the step of adding the present PVA, zinc oxide, bentonite and surfactant, and optionally iron oxide or the present inorganic compound and attaching them to the rice seed while moving and rolling the rice seed. The present coating layer 2 is formed by performing the step of adding the present PVA, zinc oxide and bentonite, and optionally iron oxide or the present inorganic compound and attaching them to the rice seed while moving and rolling the rice seed. As a device for moving and rolling rice seeds, equipment conventionally used in iron-coating, such as a coater, can be used. The present PVA, zinc oxide, bentonite, and surfactant, and optionally iron oxide or the present inorganic compound, may be used separately, or two or more or all of the components may be used in mixture. When all of the components are used in combination, a powdered composition containing the present PVA, zinc oxide, bentonite, and surfactant, and optionally iron oxide or the present inorganic compound, is used. When two or more of the components are used in mixture, for example, a powdered composition containing the present PVA, zinc oxide and bentonite, and optionally iron oxide or the present inorganic compound, and a surfactant are used. Additionally, when component α is used, component α can be used alone or in addition to a powdered composition containing the present PVA, zinc oxide and bentonite, and optionally iron oxide or the present inorganic compound. there is.

A powdered composition containing PVA, zinc oxide, and bentonite (hereinafter referred to as “powdered composition Z”), and a surfactant were used to form the present coating layer 2, which then retains the surfactant on its surface. The method for doing so is described below.

Powdered composition Z and water are added while moving and rolling the rice seeds to form the main coating layer 2 on the rice seeds. This PVA makes it possible to attach zinc oxide and bentonite to rice seeds by acting as a binder. A preferred embodiment of the present rice seed is an embodiment in which the surfactant is retained at least on its surface, and the retention of the surfactant on the surface is maintained in a state in which the rice seed is moved and rolled after forming the present coating layer 2 on the rice seed. This is achieved by adding a surfactant and attaching the surfactant to the outside of the main coating layer 2.

When using the present inorganic compound, the present inorganic compound and the powdered composition Z can be mixed and added in the above-mentioned method, or a powdered composition containing the present PVA, bentonite, and the present inorganic compound (hereinafter referred to as "powdered composition After preparing composition Y") and powdered composition Z, the compounds are added separately in the above-mentioned method.

When added separately, the present rice seeds having a first layer containing the present inorganic compound and a second layer containing zinc oxide coated on the outside of the first layer are first added to the powdered composition Y and then powdered. It can be produced by adding chemical composition Z. Specifically, the powdered composition Y and water are added while moving and rolling the rice seeds to form a first layer containing the present inorganic compound, this PVA, and bentonite, and the powdered composition Z and water are added while moving and rolling the rice seeds. is added while retaining to form a second layer containing zinc oxide, present PVA, and bentonite outside the first layer.

This powdered composition containing PVA, zinc oxide, and bentonite (hereinafter sometimes referred to as “the present composition (1)”) is suitable as a powdered composition for coating rice seeds. The average particle size of the composition (1) is in the range of 0.01 to 150 μm, preferably 1 to 150 μm, more preferably 5 to 150 μm. The average particle size of composition (1) as used herein refers to the particle size measured by a laser diffraction/scattering type particle size distribution analyzer, which is defined as the particle size corresponding to 50% accumulation in the volume-based frequency distribution. do. The average particle size of the composition (1) is measured by dispersing the particles of the composition (1) in water and then measuring them with a laser diffraction/scattering type particle size distribution analyzer, Mastersizer 2000 (manufacturer Malvern Instruments Ltd), i.e. wet measurement. It can be measured in this way.

The apparent relative density of the composition (1) is, for example, in the range of 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.50 to 2.0 g/mL, more preferably 0.60 to 1.7 g/mL. am. The apparent relative density of the composition (1) is preferably high because scattering is prevented in the production of coated rice seeds. The apparent relative density of the present composition (1) as used herein is measured by a method according to the test procedure specified in the Official Analysis Method for Pesticides (Physical Test, Ministry of Agriculture, Food and Rural Affairs Notification No. 71, February 3, 1945) do. A standard sieve of 8 mesh (as specified in Z8801-1 of the Japanese Industrial Standards (JIS)) is placed on a cylindrical container with a capacity of 100 mL made of metal with an internal diameter of 50 mm, the frame of which has a diameter of 200 mm and a depth of 45 mm. test sieve), placing the sample in the sieve, and lightly dusting it with a brush to fill the container. Afterwards, the excess sample is immediately rubbed off using a slide glass, then the sample is weighed to measure the weight of the contents, and the apparent relative density is calculated according to the equation below. The distance between the sheave and the upper side of the container is set as 20 cm.

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

The present composition (1) may contain the present inorganic compound. When the composition (1) contains the present inorganic compound, the weight ratio of zinc oxide to the present inorganic compound in the composition (1) is usually 1:1000 to 1000:1, preferably 1:1000 to 100:1, More preferably, it is within the range of 1:200 to 10:1. From the viewpoint of plant growth and impact on the environment, a range of 1:200 to 1:3 is preferred.

After forming the present coating layer 2 using a powdered composition containing present PVA, zinc oxide, iron oxide, and bentonite (hereinafter referred to as “powdered composition T”) and a surfactant, the surfactant is added to the present coating layer 2. Methods for retention on surfaces are described below.

Powdered composition T and water are added while moving and rolling the rice seeds to form the main coating layer 2 on the rice seeds. This PVA makes it possible to attach zinc oxide, iron oxide, and bentonite to rice seeds by acting as a binder. A preferred embodiment of the present rice seed is an embodiment in which the surfactant is retained at least on its surface, and the retention of the surfactant on the surface is maintained in a state in which the rice seed is moved and rolled after forming the present coating layer 2 on the rice seed. This is achieved by adding a surfactant and attaching the surfactant to the outside of the main coating layer 2.

When iron oxide and zinc oxide are used separately to form the present coating layer, the present rice seed having a first layer containing iron oxide and a second layer containing zinc oxide coated on the outside of the first layer , can be prepared by first adding this PVA and then adding zinc oxide. Specifically, while moving and rolling the rice seeds, a powdered composition containing iron oxide and this PVA, and water are added to form a first layer containing iron oxide and this PVA, and the state of moving and rolling the rice seeds is maintained. While adding the powdered composition containing zinc oxide and present PVA, and water to form a second layer containing zinc oxide and present PVA outside the first layer.

This powdered composition containing PVA, zinc oxide, iron oxide, and bentonite (hereinafter sometimes referred to as “the present composition (2)”) is suitable as a powdered composition for coating rice seeds. The average particle size of the composition (2) is in the range of 0.01 to 150 μm, preferably 1 to 150 μm, more preferably 1 to 60 μm. The average particle size of composition (2) as used herein refers to the particle size measured by a laser diffraction/scattering type particle size distribution analyzer, which is defined as the particle size corresponding to 50% accumulation in the volume-based frequency distribution. do. The average particle size of the composition (2) is measured by dispersing the particles of the composition (2) in water and then measuring them with a laser diffraction/scattering type particle size distribution analyzer, Mastersizer 2000 (manufacturer Malvern Instruments Ltd), i.e. wet measurement. It can be measured in this way.

The apparent relative density of the composition (2) is, for example, in the range of 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.30 to 2.20 g/mL, more preferably 0.50 to 2.20 g/mL. am. The apparent relative density of the composition (2) is preferably high because scattering is prevented in the production of coated rice seeds. The apparent relative density of the present composition (2) as used herein is measured by a method according to the test procedure specified in the Official Analysis Method for Pesticides (Physical Test, Ministry of Agriculture, Food and Rural Affairs Notification No. 71, February 3, 1945) do. A standard sieve of 8 mesh (as specified in Z8801-1 of the Japanese Industrial Standards (JIS)) is placed on a cylindrical container with a capacity of 100 mL made of metal with an internal diameter of 50 mm, the frame of which has a diameter of 200 mm and a depth of 45 mm. test sieve), placing the sample in the sieve, and lightly dusting it with a brush to fill the container. Afterwards, the excess sample is immediately rubbed off using a slide glass, then the sample is weighed to measure the weight of the contents, and the apparent relative density is calculated according to the equation below. The distance between the sheave and the upper side of the container is set as 20 cm.

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

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

Some examples of the composition (1) are described below. In the examples below, % represents wt% for the present composition (1).

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of clay and calcium carbonate, wherein the average Particle size is 0.01 to 150 μm, apparent relative density is 0.30 to 2.0 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 1000 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of clay and calcium carbonate, wherein the average Particle size is 1 to 150 μm, apparent relative density is 0.50 to 2.0 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of clay and calcium carbonate, wherein the average Particle size is 5 to 150 μm, apparent relative density is 0.60 to 1.7 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of chlorophyll and calcium carbonate, wherein The average particle size is 0.01 to 150 μm and the apparent relative density is 0.30 to 2.0 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 1000 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of chlorophyll and calcium carbonate, wherein The average particle size is 1 to 150 μm and the apparent relative density is 0.50 to 2.0 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of chlorophyll and calcium carbonate, wherein The average particle size is 5 to 150 μm and the apparent relative density is 0.60 to 1.7 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and calcium carbonate, wherein the average particle size is 5 to 150 μm and the apparent relative density is 0.60 to 1.7 g/mL;

0.5 to 60% of zinc oxide, 0.5 to 3% of polyvinyl alcohol with a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, 1 to 5% of bentonite, and 32 to 98% of calcium carbonate. A powdered composition containing: an average particle size of 5 to 50 μm and an apparent relative density of 0.80 to 1.5 g/mL;

Contains 2 to 50% zinc oxide, 0.5 to 3% polyvinyl alcohol with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, 1 to 5% bentonite, and 42 to 86.5% calcium carbonate. A powdered composition comprising: an average particle size of 15 to 45 μm and an apparent relative density of 1.0 to 1.3 g/mL;

A powdered composition containing 48.3% zinc oxide, 1.0% polyvinyl alcohol with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, 2.4% bentonite, and 48.3% calcium carbonate, wherein the average Particle size is 16.4 μm;

A powdered composition containing 24.1% zinc oxide, 1.0% polyvinyl alcohol with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, 2.4% bentonite, and 72.5% calcium carbonate, wherein the average Particle size is 24.6 μm;

A powdered composition containing 4.8% zinc oxide, 1.0% polyvinyl alcohol with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, 2.4% bentonite, and 91.8% calcium carbonate, wherein the average The particle size is 42.7 μm and the apparent relative density is 1.2 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and clay, with an average particle size of 5 to 150 μm and an apparent relative Density is 0.60 to 1.7 g/mL;

A powdered composition containing zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 to 97.5 mol%, bentonite, and chlorophyllite, wherein the average particle size is 5 to 150 μm and the apparent relative density is 0.60 to 1.7 g/mL;

Containing 1 to 15% of zinc oxide, 0.5 to 3% of polyvinyl alcohol with a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 to 89.0 mol%, 1 to 5% of bentonite, and 77 to 97.5% of pyrophyllite. A powdered composition comprising: an average particle size of 1 to 30 μm and an apparent relative density of 0.60 to 1.2 g/mL; and

A powdered composition containing 9.6% zinc oxide, 1.0% polyvinyl alcohol with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, 2.4% bentonite, and 87% chlorophyll, wherein the average Particle size is 22.5 μm.

Some examples of the present composition (2) are described below. In the examples below, % represents wt% for the present composition (2).

A powdered composition containing polyvinyl alcohol, zinc oxide, iron oxide, and bentonite having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 to 97.5 mol%, wherein the average particle size is 1 to 60 μm, The apparent relative density is 0.50 to 2.20 g/mL;

0.5 to 3% of polyvinyl alcohol with a degree of polymerization from 500 to 3000 and a degree of saponification in the range from 78.5 to 97.5 mol%, 1 to 60% of zinc oxide, 32 to 97.5% of iron oxide, and 1 to 5% of A powdered composition containing bentonite, wherein the average particle size is 5 to 60 μm and the apparent relative density is 1.00 to 2.20 g/mL;

0.5 to 3% of polyvinyl alcohol with a degree of polymerization from 1000 to 2500 and a degree of saponification in the range from 86.5 to 97.5 mol%, 3 to 50% of zinc oxide, 42 to 95.5% of iron oxide, and 1 to 5% of A powdered composition containing bentonite, wherein the average particle size is 15 to 50 μm and the apparent relative density is 1.20 to 2.20 g/mL;

A powdered composition containing 1.0% of polyvinyl alcohol, 48.3% of zinc oxide, 48.3% of iron oxide, and 2.4% of bentonite with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, wherein The average particle size is 11.6 μm;

A powdered composition containing 2.0% of polyvinyl alcohol, 9.5% of zinc oxide, 86.1% of iron oxide, and 2.4% of bentonite with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, wherein The average particle size is 11.2 μm and the apparent relative density is 1.77 g/mL; and

A powdered composition containing 1.0% of polyvinyl alcohol, 4.8% of zinc oxide, 91.8% of iron oxide, and 2.4% of bentonite with a degree of polymerization of 2000 and a degree of saponification in the range from 87.0 to 89.0 mol%, wherein The average particle size is 20.2 μm and the apparent relative density is 2.01 g/mL.

The present method for producing rice seeds (hereinafter referred to as “this production method”) is described. In this production method, rice seeds are usually soaked before use. Soaking can be accomplished as follows. First, dry rice seeds are placed in the same bag as the seed rice bag and immersed in water. The seeds are preferably soaked in water at 15 to 20° C. for 3 to 4 days to produce coated rice seeds with a high germination rate. After the rice seeds are recovered from the water, they are usually left to stand or are spin-dried to remove excess water on the surface.

First, a method for producing coated rice seeds having a coating layer containing the present PVA, zinc oxide, bentonite, and the present inorganic compound, in which the surfactant is retained on the surface of the layer (hereinafter referred to as “the present production method 1”) ) is listed. This production method 1 includes the following steps.

(1) adding PVA, zinc oxide, bentonite, inorganic compound, and water while moving and rolling rice seeds to form a coating layer containing PVA, zinc oxide, bentonite, and inorganic compound, (2) ) adding a surfactant while moving and rolling the rice seeds obtained in step (1) to retain the surfactant outside the coating layer formed by step (1), and (3) drying the rice seeds obtained in step (2) Step of ordering.

In this production method 1, first, the soaked rice seeds are moved and rolled to form a powdered composition containing PVA, zinc oxide, bentonite, and the present inorganic compound (hereinafter referred to as “powdered composition X”), and water. A step of adding the present PVA, zinc oxide, bentonite, and the present inorganic compound to form a coating layer (hereinafter referred to as “Step 1”) is performed. In step 1, water can be added first, then powdered composition X can be added, the order can be reversed. Additionally, water and powdered composition X can be added simultaneously. While adding water and powdered composition Methods of adding water may include dripping and spraying. After addition of water and powdered composition

In this production method 1, the total amount of zinc oxide added is usually in the range of 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, and more preferably 0.1 to 50 parts by weight, based on 100 parts by weight of dry rice seeds. From the viewpoint of plant growth and influence on the environment, the preferred range is 0.1 to 25 parts by weight. The total amount of the inorganic compound added is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, and more preferably 1 to 100 parts by weight, based on 100 parts by weight of dry rice seeds. The total amount of powdered composition The total amount of this PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, and more preferably 0.05 to 4 parts by weight, based on 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to the powdered composition

In Step 1, a single coating layer can be formed by dividing and adding the powdered composition X and repeating Step 1. In this case, the single addition amount of the powdered composition 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 powdered composition X.

In Step 1, when the powdered composition

After performing Step 1, a step of adding a surfactant while moving and rolling the seed obtained in Step 1 to retain the surfactant outside the coating layer formed by Step 1 (hereinafter referred to as “Step 2”) is performed. In step 2, after performing step 1, adding a surfactant while maintaining the rolling state of moving the rice seed ensures retention of the surfactant outside the coating layer containing the present PVA, zinc oxide, bentonite, and the present inorganic compound. Make it possible.

After performing Step 2, a step of drying the seeds obtained in Step 2 is performed to obtain the present seed. Specifically, after performing step 2, the rice seeds are recovered from the device, placed in a seedling box, and spread thinly there to dry. Rice seeds are usually dried to a water content of less than 20% (wt% for coated rice seeds). The water content of coated rice seeds as used herein represents the value determined by drying a 10 g sample at 105° C. for 1 hour using an infrared moisture meter. FD-610 (manufacturer Kett Electric Laboratory) can be used as an infrared moisture meter. Additionally, mats or plastic sheets can be used instead of seedling boxes, where they can be spread thinly and left to dry.

Next, the present PVA, zinc oxide, wherein the coating layer has a first layer containing the present inorganic compound and a second layer containing zinc oxide coated on the outside of the first layer, and the surfactant is retained on its surface. A method for producing coated rice seeds having bentonite and a coating layer containing the present inorganic compound (hereinafter referred to as “this production method 2”) is described. This production method 2 includes the following steps.

(1) (I) adding PVA, bentonite, inorganic compound, and water while moving and rolling the rice seeds to form a coating layer containing PVA, bentonite, and inorganic compound, and (II) step (I) ) Adding PVA, zinc oxide, bentonite, and water while moving and rolling the seeds obtained in ) to form a coating layer containing PVA, zinc oxide, and bentonite on the outside of the layer formed by step (I), (2) adding a surfactant while moving and rolling the seeds obtained in step (1) to retain the surfactant outside the layer formed by step (1), and (3) drying the seeds obtained in step (2). Step of ordering.

In this production method 2, first, a powdered composition containing PVA, bentonite, and the present inorganic compound (hereinafter referred to as “powdered composition W”), and water are added while moving and rolling the soaked rice seeds. A step of forming a coating layer containing PVA, bentonite, and the present inorganic compound (hereinafter referred to as “Step I”) is performed. Step I can be carried out according to a procedure similar to Step 1 of Preparation Method 1, except that Powdered Composition W is used instead of Powdered Composition X. After carrying out step I, a powdered composition containing PVA, zinc oxide, and bentonite (hereinafter referred to as “powdered composition V”), which was obtained by moving and rolling the seeds obtained in step I, and water were added to the step. A step of forming a coating layer containing the present PVA, zinc oxide, and bentonite outside the layer formed by I (hereinafter referred to as “Step II”) is performed. Step II can be performed following a procedure similar to Step I, except that Powdered Composition V is used instead of Powdered Composition W.

In this production method 2, the total amount of iron oxide added 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 dry rice seeds. From the viewpoint of plant growth and influence on the environment, a range of 0.1 to 25 parts by weight is preferable. The total amount of the inorganic compound added is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, and more preferably 1 to 100 parts by weight, based on 100 parts by weight of dry rice seeds. The total amount of powdered 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 dry rice seeds. The total added amount of the powdered composition W is usually in the range of 5 to 250 parts by weight, preferably 5 to 200 parts by weight, and more preferably 5 to 150 parts by weight, based on 100 parts by weight of dry rice seeds. The total amount of this PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, and more preferably 0.05 to 4 parts by weight, based on 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to powdered composition V is usually in the range from 1:200 to 1:10, preferably from 1:150 to 1:20. The weight ratio of the present PVA to the powdered composition W is usually in the range from 1:200 to 1:10, preferably from 1:1500 to 1:20.

After performing step II, step 2 and subsequent steps of this production method 1 are performed similarly.

Next, a method for producing coated rice seeds with the present coating layer 2, in which the surfactant is retained on the surface of the layer (hereinafter referred to as “present production method 3”) is described. This production method 3 includes the following steps.

(1) forming the main coating layer 2 by adding PVA, zinc oxide, iron oxide, bentonite, and water while moving and rolling the rice seeds; (2) forming the main coating layer 2 by moving and rolling the rice seeds obtained in step (1); adding an activator to retain the surfactant outside the coating layer formed by step (1), and (3) drying the rice seeds obtained in step (2).

In this production method 3, first, the step of adding the powdered composition Z and water while moving and rolling the soaked rice seeds to form the main coating layer 2 (hereinafter referred to as “step 1'”) is performed. In step 1', water may be added first, followed by the powdered composition T, and the order may be reversed. Additionally, water and powdered composition T can be added simultaneously. While adding water and powdered composition T, the rice seeds are kept in contact with the rice seeds while being moved and rolled. Methods of adding water may include dripping and spraying. After addition of water and powdered composition T, zinc oxide, iron oxide, and bentonite are attached to the rice seeds while maintaining a rolling state by using the present PVA as a binder.

In this production method 3, the total amount of zinc oxide added 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 dry rice seeds. From the viewpoint of plant growth and influence on the environment, the preferred range is 0.1 to 25 parts by weight. 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 dry rice seeds. The total added amount of the powdered composition T is usually in the range of 5 to 500 parts by weight, preferably 5 to 300 parts by weight, and more preferably 10 to 200 parts by weight, based on 100 parts by weight of dry rice seeds. The total amount of this PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, and more preferably 0.05 to 4 parts by weight, based on 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to the powdered composition T is usually in the range from 1:200 to 1:10, preferably from 1:150 to 1:20.

In Step 1', a single coating layer can be formed by dividing and adding the powdered composition T and repeating Step 1'. In this case, the single addition amount of the powdered composition T is usually about 1 to 1/10, preferably about 1/2 to 1/5 of the total addition amount of the powdered composition T. 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 powdered composition T.

In step 1', when the powdered composition T sticks to the inner wall of the device, approximately the entire amount of the added powdered composition T can be made to adhere to the rice seeds by scraping off the powdered composition T with a scraper or the like.

After performing step 1', adding a surfactant while moving and rolling the seeds obtained in step 1' to retain the surfactant outside the main coating layer 2 formed by step 1' (hereinafter referred to as "step 2'") ) is performed. In step 2', after performing step 1', adding a surfactant while maintaining the rice seed in a rolling state enables retention of the surfactant outside the present coating layer 2.

After performing step 2', the present rice seeds are obtained by performing a step of drying the seeds obtained in step 2'. Specifically, after performing step 2', rice seeds are recovered from the device, placed in a seedling box, and spread thinly there to dry. Rice seeds are usually dried to a water content of less than 20% (wt% for coated rice seeds). The water content of coated rice seeds as used herein represents the value determined by drying a 10 g sample at 105° C. for 1 hour using an infrared moisture meter. FD-610 (manufacturer Kett Electric Laboratory) can be used as an infrared moisture meter. Additionally, mats or plastic sheets can be used instead of seedling boxes, where they can be spread thinly and left to dry.

Next, the main coating layer 2 has a main coating layer 2, which has a first layer containing iron oxide and a second layer containing zinc oxide coated on the outside of the first layer, and the surfactant is retained on its surface. A method for producing coated rice seeds (hereinafter referred to as “this production method 4”) is described. This production method 4 includes the following steps.

(1') (i) adding PVA, iron oxide, bentonite, and water while moving and rolling the rice seeds to form a coating layer containing PVA, iron oxide, and bentonite, and (ii) step ( Adding PVA, zinc oxide, bentonite, and water while moving and rolling the seeds obtained in i) to form a coating layer containing PVA, zinc oxide, and bentonite on the outside of the layer formed by step (i). , (2') adding a surfactant while moving and rolling the seed obtained in step (1') to retain the surfactant outside the layer formed by step (1'), and (3') step (2') Step of drying the seeds obtained from.

In this production method 4, first, a powdered composition containing PVA, iron oxide, and bentonite (hereinafter referred to as "powdered composition S"), which was prepared by moving and rolling the soaked rice seeds, and water were added. A step of forming a coating layer containing PVA, iron oxide, and bentonite (hereinafter referred to as “step i”) is performed. Step i can be carried out according to a procedure similar to step 1' of the present preparation method 4, except that powdered composition S is used instead of powdered composition T. After carrying out step i, a powdered composition containing PVA, zinc oxide, and bentonite (hereinafter referred to as “powdered composition R”), as seen by moving and rolling the seeds obtained in step i, and water are added to the step. A step of forming a coating layer containing the present PVA, zinc oxide, and bentonite outside the layer formed by i (hereinafter referred to as “step ii”) is performed. Step ii can be performed following a procedure similar to step i, except that powdered composition R is used instead of powdered composition S.

In this production method 4, the total amount of zinc oxide added 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 dry rice seeds. From the viewpoint of plant growth and influence on 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 dry rice seeds. The total added amount of the powdered composition S is usually in the range of 5 to 250 parts by weight, preferably 5 to 150 parts by weight, and more preferably 5 to 100 parts by weight, based on 100 parts by weight of dry rice seeds.

The total added amount of the powdered composition R 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 dry rice seeds. The total amount of this PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, and more preferably 0.05 to 4 parts by weight, based on 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to the powdered composition S is usually in the range from 1:200 to 1:10, preferably from 1:150 to 1:20. The weight ratio of the present PVA to the powdered composition R is usually in the range from 1:200 to 1:10, preferably from 1:150 to 1:20.

After performing step II, steps 2' and beyond of this production method 3 are performed similarly.

This rice seed can be used in direct sowing cultivation of paddy rice, and this method is carried out by sowing this rice seed directly into the paddy field. As used herein, rice field refers to either a freshwater rice field or a flooded rice field. Specifically, sowing is performed according to the method described in Minoru Yamauchi, "A manual for direct sowing of iron-coated rice on a flooded paddy field 2010", The National Agriculture and Food Research Organization, Western Region Agricultural Research Center, March 2010. . At this time, a direct seeder for iron-coating such as Tetsumakichan (manufacturer Kubota Corporation) can be used. Sowing by the conventional method makes it possible to achieve good seedling composition. After sowing, maintaining normal cultivation conditions makes rice cultivation possible.

Pesticides and fertilizers can be applied before sowing, at the same time as sowing, or after sowing. Pesticides include fungicides, insecticides, and herbicides.

Example

The invention is described in more detail by way of examples.

First, preparation examples and comparative preparation examples are described.

In the following preparation examples and comparative preparation examples, unless otherwise stated, seeds of the Hitohikari variety were used as rice seeds, and iron oxide had an average particle size of 42.7 μm with a content of α-Fe ₂ O ₃ of 78%. was used. The preparation method was carried out at room temperature (about 20° C.). Additionally, % represents wt%.

Additionally, the brand names used in the production examples and comparative production examples are as follows.

LPZINC-20: Zinc oxide, manufacturer Sakai Chemical Industry Co., Ltd., average particle size; 27.4 μm

Zinc Oxide 3N5: Zinc Oxide, Manufacturer KANTO CHEMICAL CO., INC., Average Particle Size; 7.7 μm

Zinc Oxide Grade 2: Zinc Oxide, Manufacturer NIPPON CHEMICAL INDUSTRIAL CO.,LTD., Average Particle Size; 0.24 μm

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

Calcium carbonate for granulation: Calcium carbonate, manufacturer YAKUSEN SEKKAI Co., Ltd., average particle size; 6.2 μm

DL clay for dusting: pyrophyllite, manufacturer SHOKOZAN MINING Co., Ltd., average particle size; 30.3 μm

Rutile powder: titanium oxide, manufacturer KINSEI MATEC CO., LTD., average particle size; 14.6 μm

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

SHOKOZAN CLAY S: Foliar stone, Manufacturer SHOKOZAN MINING Co., Ltd.

Bentonite HOTAKA: Montmorillonite, Manufacturer HOJUN Co., Ltd.

DAE1K: Iron Powder, Manufacturer DOWA IP CREATION CO., LTD.

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

KURARAY POVAL PVA-220S: Polyvinyl alcohol, degree of saponification; 87.0 to 89.0 mol%, degree of polymerization; 2000, Manufacturer KURARAY CO., LTD.

GOHSENOL GM-14S: Polyvinyl alcohol, degree of saponification; 86.5 to 89.0 mol%, degree of polymerization; 1000 to 1500, manufactured by The Nippon Synthetic Chemical Industry Co., Ltd.

KURARAY POVAL PVA-205S: Polyvinyl alcohol, degree of saponification; 86.5 to 89.0 mol%, degree of polymerization; 500, manufactured by KURARAY CO., LTD.

KURARAY POVAL PVA-224S: Polyvinyl alcohol, degree of saponification; 87.0 to 89.0 mol%, degree of polymerization; 2400, Manufacturer KURARAY CO., LTD.

SORPOL5080: Polyoxyethylene tristyrylphenyl ether, Manufacturer TOHO Chemical Industry Co., Ltd.

Manufacturing Example 1

First, a simple seed coater was manufactured for coating a small amount of rice seeds. As shown in Figure 1, a cup (2) with a capacity of 500 mL made of polyethylene is fixed to the tip of the shaft (1), and it is mixed with the mixer (3) (Three-One Motor, manufactured by Shinto Scientific Co., Ltd.). A simple seed coater was manufactured by inserting it into the drive shaft and fixing it on the stand (4) so that the mixer (3) was inclined at an upward angle of 45 degrees.

Then, 2 g of zinc oxide second grade, 0.2 g of GOHSENOL GM-14S, and 0.25 g of bentonite HOTAKA were mixed to obtain the powdered composition (1).

About 100 mL of water was poured into a 200 mL cup made of polyethylene, 20 g of dry rice seeds were added thereto, and soaked for 10 minutes. Thereafter, the rice seeds were recovered from the water, excess water adhering to the surface was removed, and then the rice seeds were loaded into a cup (2) made of polyethylene fixed on the simple seed coater fabricated. A simple seed coater was operated in the mixer (3) at a rotational speed within the range of 130 to 140 rpm to move and roll the rice seeds, and then water was sprayed on the rice seeds with a sprayer while about 1/4 of 2.45 g of the powdered composition (1) was applied. (about 0.6 g) was added to the rice seeds to cause the powdered composition (1) to adhere to the rice seeds. If the powdered composition (1) sticks to the inner wall of the cup (2) made of polyethylene, approximately the entire amount of the single addition powdered composition (1) is adhered to the rice seeds by scraping off the powdered composition (1) with a spatula. I ordered it. By repeating the similar method three times, 2.45 g of the powdered composition (1) was attached to the rice seeds to form a coating layer. The total amount of water used for coating was 2.4 g. Afterwards, under the condition of moving and rolling the rice seeds while maintaining the operation of the simple seed coater, 0.1 g of SORPOL5080 was added to the rice seeds and adhered to the outside of the coating layer. The coated rice seeds recovered from the simple seed coater 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

Powdered composition (2) was obtained by mixing 2 g of zinc oxide grade 2, 0.1 g of KURARAY POVAL PVA-205S, and 0.25 g of bentonite HOTAKA.

The following method was performed according to the method described in Preparation Example 1. By using 2.35 g of the above powdered composition (2) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (2) were obtained. The total amount of water used for coating was 0.5 g.

Production example 3

10 g of LPZINC-20, 0.1 g of KURARAY POVAL PVA-224S, and 0.25 g of bentonite HOTAKA were mixed to obtain the powdered composition (3).

The following method was performed according to the method described in Preparation Example 1. By using 10.35 g of the above powdered composition (3) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (3) were obtained. The total amount of water used for coating was 1.4 g.

Production example 4

Powdered composition (4) was obtained by mixing 5 g of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (4) was 16.4 μm.

The following method was performed according to the method described in Preparation Example 1. By using 10.35 g of the above powdered composition (4) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (4) were obtained. The total amount of water used for coating was 2.8 g.

Production example 5

10 g of zinc oxide 3N5, 10 g of calcium carbonate for granulation, 0.2 g of KURARAY POVAL PVA-220S, and 0.5 g of bentonite HOTAKA were mixed to obtain a powdered composition (5). The average particle size of the powdered composition (5) was 8.2 μm.

The following method was performed according to the method described in Preparation Example 1. By using 20.7 g of the above powdered composition (5) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (5) were obtained. The total amount of water used for coating was 5.6 g.

Production example 6

20 g of zinc oxide 3N5, 20 g of calcium carbonate for granulation, 0.4 g of KURARAY POVAL PVA-220S, and 1.0 g of bentonite HOTAKA were mixed to obtain a powdered composition (6). The average particle size of the powdered composition (6) was 8.2 μm.

The following method was performed according to the method described in Preparation Example 1. By using 41.4 g of the above powdered composition (6) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (6) were obtained. The total amount of water used for coating was 10.3 g.

Production example 7

Powdered composition (7) was obtained by mixing 1 g of zinc oxide 3N5, 9 g of rutile powder, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (7) was 15.1 μm.

The following method was performed according to the method described in Preparation Example 1. By using 10.35 g of the above powdered composition (7) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (7) were obtained. The total amount of water used for coating was 1.4 g.

Production example 8

Powdered composition (8) was obtained by mixing 1 g of zinc oxide 3N5, 9 g of Sun Zeolite MGF, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (8) was 131.1 μm.

The following method was performed according to the method described in Preparation Example 1. By using 10.35 g of the above powdered composition (8) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (8) were obtained. The total amount of water used for coating was 4.2 g.

Production example 9

Powdered composition (9) was obtained by mixing 1 g of zinc oxide 3N5, 9 g of DL clay for dusting, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (9) was 22.5 μm.

The following method was performed according to the method described in Preparation Example 1. By using 10.35 g of the above powdered composition (9) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (9) were obtained. The total amount of water used for coating was 2.4 g.

Production example 10

Powdered composition (10) was obtained by mixing 0.1 g of zinc oxide second grade, 9.9 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (10) was 44.5 μm, and its apparent relative density was 1.2 g/mL.

The following method was performed according to the method described in Preparation Example 1. By using 10.35 g of the above powdered composition (10) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (10) were obtained. The total amount of water used for coating was 2.3 g.

Production example 11

70.0 parts by weight (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroguanidine (common name: clothianidin) and 30.0 parts by weight SHOKOZAN CLAY S was mixed and milled with a centrifugal mill to obtain powdered pesticide A. The average particle size of powdered pesticide A was 13.0 μm, as determined by the wetting method using Mastersizer 2000 (manufacturer Malvern Instruments Ltd). 5 g of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, 0.25 g of bentonite HOTAKA and 0.086 g of powdered pesticide A were mixed to obtain a powdered composition (11). did.

The following method was performed according to the method described in Preparation Example 1. By using 10.436 g of the above powdered composition (11) instead of 2.45 g of the powdered composition (1), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (11) were obtained. The total amount of water used for coating was 3.9 g.

Production example 12

5 g of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, 0.25 g of bentonite HOTAKA, and 0.01 g of SORPOL5080 were mixed to obtain the powdered composition (12).

The following method was performed according to the method described in Preparation Example 1. By using 10.36 g of the above powdered composition (12) instead of 2.45 g of the powdered composition (1), the coated rice seeds (12) of the present invention were obtained by adding the composition in 4 parts to form a coating layer. The total amount of water used for coating was 2.3 g.

Production Example 13

5 g of rutile powder, 0.1 g of KURARAY POVAL PVA-224S, and 0.15 g of bentonite HOTAKA were mixed to obtain a powdered composition (13-1). Additionally, 5 g of zinc oxide 3N5, 0.1 g of KURARAY POVAL PVA-224S, and 0.15 g of bentonite HOTAKA were mixed to obtain a powdered composition (13-2).

The following method was performed according to the method described in Preparation Example 1. After soaking 20 g of dry rice seeds, about 1/4 (about 1.3 g) of 5.25 g of powdered composition (13-1) was added to the rice seeds while spraying water with a sprayer to allow the composition to adhere to the rice seeds. . If the powdered composition (13-1) sticks to the inner wall of the cup (2) made of polyethylene, approximately the entire amount of the single addition powdered composition (13-1) is removed by scraping off the powdered composition (13-1) with a spatula. ) was attached to rice seeds. By repeating the similar method three times, 5.25 g of the powdered composition (13-1) was attached to the rice seeds to form a first coating layer containing rutile powder (hereinafter referred to as “first layer”). The total amount of water used for coating was 1.3 g.

Thereafter, under the condition of moving and rolling the rice seeds while maintaining the operation of the simple seed coater, about 1/4 (about 1.3 g) of 5.25 g of the powdered composition (13-2) was added to the rice seeds while spraying water with a sprayer. Thus, the composition was attached to the outside of the first layer. If the powdered composition (13-2) sticks to the inner wall of the cup (2) made of polyethylene, approximately the entire amount of the single addition powdered composition (13-2) is removed by scraping off the powdered composition (13-2) with a spatula. ) was attached to rice seeds. By repeating the similar method three times, 5.25 g of the powdered composition (13-2) was attached to the outside of the first layer to form a second coating layer containing zinc oxide (hereinafter referred to as “second layer”) outside the first layer. (referred to as ) was formed. The total amount of water used for coating was 2.9 g.

Under the condition of moving and rolling the rice seeds while operating a simple seed coater, 0.1 g of SORPOL5080 was added to the rice seeds and adhered to the outside of the second layer. The rice seeds recovered from the simple seed coater were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (13) of the present invention.

Production example 14

Powdered composition (14) was obtained by mixing 5 g of zinc oxide 3N5, 5 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition 14 is 11.6 μm.

About 100 mL of water was poured into a 200 mL cup made of polyethylene, 20 g of dry rice seeds were added thereto, and soaked for 10 minutes. Thereafter, the rice seeds were recovered from the water, excess water attached to the surface was removed, and the rice seeds were loaded into a cup (2) made of polyethylene fixed to the simple seed coater manufactured. A simple seed coater was operated in the mixer (3) at a rotation speed in the range of 130 to 140 rpm to move and roll the rice seeds, and then sprayed with water using a sprayer to coat about 1/4 (about 2.6 g) of the powdered composition (14) of 10.35 g. g) was added to the rice seeds to cause the powdered composition (14) to adhere to the rice seeds. If the powdered composition (14) sticks to the inner wall of the cup (2) made of polyethylene, approximately the entire amount of the single addition powdered composition (14) is adhered to the rice seeds by scraping off the powdered composition (14) with a spatula. I ordered it. By repeating the similar method three times, 10.35 g of the powdered composition (14) was attached to the rice seeds to form a coating layer. The total amount of water used for coating was 1.7 g. Afterwards, under the condition of moving and rolling the rice seeds while maintaining the operation of the simple seed coater, 0.1 g of SORPOL5080 was added to the rice seeds and adhered to the outside of the coating layer. The coated rice seeds recovered from the simple seed coater were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (14) of the present invention.

Production Example 15

2 g of zinc oxide grade 2, 18 g of iron oxide, 0.2 g of KURARAY POVAL PVA-220S, and 0.5 g of bentonite HOTAKA were mixed to obtain a powdered composition (15). The average particle size of the powdered composition (15) was 8.1 μm, and its apparent relative density was 1.77 g/mL.

The following method was performed according to the method described in Preparation Example 14. By using 20.7 g of the above powdered composition (15) instead of 10.35 g of the powdered composition (14), the composition was added in 4 parts to form a coating layer, and then 0.2 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (15) were obtained. The total amount of water used for coating was 3.5 g.

Production example 16

Powdered composition (16) was obtained by mixing 1 g of zinc oxide grade 2, 9 g of iron oxide, 0.2 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (16) was 11.3 μm, and its apparent relative density was 1.77 g/mL.

The following method was performed according to the method described in Preparation Example 14. By using 10.45 g of the above powdered composition (16) instead of 10.35 g of the powdered composition (14), the composition was added in four portions to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (16) were obtained. The total amount of water used for coating was 1.9 g.

Production Example 17

Powdered composition (17) was obtained by mixing 1 g of zinc oxide second grade, 9 g of iron oxide, 0.1 g of GOHSENOL GM-14S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (17) was 8.5 μm.

The following method was performed according to the method described in Preparation Example 14. By using 10.35 g of the above powdered composition (17) instead of 10.35 g of the powdered composition (14), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (17) were obtained. The total amount of water used for coating was 2.1 g.

Production example 18

Powdered composition (18) was obtained by mixing 1 g of zinc oxide second grade, 9 g of iron oxide, 0.1 g of KURARAY POVAL PVA-224S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition (18) was 7.9 μm.

The following method was performed according to the method described in Preparation Example 14. By using 10.35 g of the above powdered composition (18) instead of 10.35 g of the powdered composition (14), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (18) were obtained. The total amount of water used for coating was 2.0 g.

Production example 19

2 g of zinc oxide second grade, 0.2 g of iron oxide, 0.1 g of KURARAY POVAL PVA-205S, and 0.25 g of bentonite HOTAKA were mixed to obtain the powdered composition (19). The average particle size of the powdered composition (19) was 3.1 μm, and its apparent relative density was 0.61 g/mL.

The following method was performed according to the method described in Preparation Example 14. By using 2.55 g of the above powdered composition (19) instead of 10.35 g of the powdered composition (14), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (19) were obtained. The total amount of water used for coating was 0.6 g.

Production example 20

Powdered composition (20) was obtained by mixing 0.5 g of zinc oxide second grade, 9.5 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA. The average particle size of the powdered composition 20 was 20.2 μm, and its apparent relative density was 2.01 g/mL.

The following method was performed according to the method described in Preparation Example 14. By using 10.35 g of the above powdered composition (20) instead of 10.35 g of the powdered composition (14), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (20) were obtained. The total amount of water used for coating was 1.7 g.

Production example 21

70.0 parts by weight (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroguanidine (common name: clothianidin) and 30.0 parts by weight SHOKOZAN CLAY S was mixed and milled with a centrifugal mill to obtain powdered pesticide B. The average particle size of powdered pesticide B was 13.0 μm, as determined by the wetting method using Mastersizer 2000 (manufacturer Malvern Instruments Ltd).

Powdered composition (21) was prepared by mixing 1 g of zinc oxide grade 2, 9 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S, 0.25 g of bentonite HOTAKA, and 0.086 g of powdered pesticide B. Obtained. The average particle size of the powdered composition (21) was 9.6 μm.

The following method was performed according to the method described in Preparation Example 14. By using 10.436 g of the above powdered composition (21) instead of 10.35 g of the powdered composition (14), the composition was added in 4 parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the outside of the coating layer to prepare the present invention. Coated rice seeds (21) were obtained. The total amount of water used for coating was 1.9 g.

Production example 22

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

Additionally, 1 g of zinc oxide 3N5, 0.01 g of GOHSENOL GM-14S, and 0.025 g of bentonite HOTAKA were mixed to obtain a powdered composition (22-2).

The following method was performed according to the method described in Preparation Example 14. After soaking 20 g of dry rice seeds, moving and rolling the rice seeds using a simple seed coater, then spraying water with a sprayer and applying about 1/4 (about 2.3 g) of 9.315 g of the powdered composition (22-1). It was added to rice seeds to cause the composition to adhere to the rice seeds. If the powdered composition (22-1) sticks to the inner wall of the cup (2) made of polyethylene, approximately the entire amount of the single addition powdered composition (22-1) is removed by scraping off the powdered composition (22-1) with a spatula. ) was attached to rice seeds. By repeating the similar method three times, 9.315 g of the powdered composition (22-1) was attached to the rice seeds to form a first coating layer containing iron oxide (hereinafter referred to as “first layer”). The total amount of water used for coating was 0.6 g.

Thereafter, under the condition of moving and rolling the rice seeds while maintaining the operation of the simple seed coater, about 1/4 (about 0.26 g) of 1.035 g of the powdered composition (22-2) was added to the rice seeds while spraying water with a sprayer. Thus, the composition was attached to the outside of the first layer. If the powdered composition (22-2) sticks to the inner wall of the cup (2) made of polyethylene, approximately the entire amount of the single addition powdered composition (22-2) is removed by scraping off the powdered composition (22-2) with a spatula. ) was attached to rice seeds. By repeating the similar method three times, 1.035 g of the powdered composition (22-2) was attached to the outside of the first layer to form a second coating layer containing zinc oxide (hereinafter referred to as “second layer”) outside the first layer. (referred to as ) was formed. The total amount of water used for coating was 0.9 g.

Under the condition of moving and rolling the rice seeds while operating a simple seed coater, 0.1 g of SORPOL5080 was added to the rice seeds and adhered to the outside of the second layer. The rice seeds recovered from the simple seed coater were spread on a stainless steel tray without overlapping and dried overnight to obtain the coated rice seeds (22) 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.

The following method was performed according to the method described in Preparation Example 1. Soak 20 g of dry rice seeds, and add about 1/4 (about 2.8 g) of 11 g of iron mixture A to the rice seeds while moving and rolling the rice seeds under the operation of a simple seed coater and spraying of water into the dropper to form the iron mixture. A was attached to rice seeds. When the iron mixture A stuck to the inner wall of the cup 2 made of polyethylene, approximately the entire amount of the single addition iron mixture A was allowed to adhere to the rice seeds by scraping the iron mixture A with a spatula. By repeating a similar method three times, 11 g of iron mixture A was attached to rice seeds to form a coating layer. The total amount of water used for coating was 1.9 g. Afterwards, under the condition of moving and rolling the rice seeds while maintaining the operation of the simple seed coater, 0.5 g of KTS-1 was added to the rice seeds and adhered to the outside of the coating layer. The rice seeds recovered from the simple seed coater were spread on a stainless steel tray to avoid overlapping, then water was sprayed on the rice seeds three times over two days to accelerate the oxidation of iron, and then the rice seeds were dried overnight for coating for comparison. Rice seeds (I) were obtained.

Next, a test example is shown.

Test example 1

A Petri dish made of plastic is filled with about 30 g of soil, moistened with water, and 50 grains of coated rice seeds are sown on the soil surface. After leaving the Petri dish outdoors, its condition was observed by taking pictures with a time-lapse camera, the number of coated rice seeds remaining one day after sowing was counted, and the survival rate was calculated according to the equation below. .

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

The results are shown in Table 1. The rice seeds in Table 1 (as a control) represent uncoated rice seeds, and the survival rate of the seeds was 0% due to deprivation by birds such as sparrows.

Test example 2

Wet gauze was spread on a petri dish made of plastic, and then 20 grains of coated rice seeds were sown on the surface. After covering the Petri dish, it was left standing in a thermostat set at 17°C. After 10 days, the presence or absence of seed germination was examined, and the germination rate was calculated according to the equation below.

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

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 examined by visual observation.

The results are shown in Table 3.

Test example 4

A Petri dish made of plastic is filled with about 30 g of soil, moistened with water, and 50 grains of coated rice seeds are sown on the soil surface. After leaving the Petri dish outdoors, its condition was observed by taking pictures with a time-lapse camera, the number of coated rice seeds remaining one day after sowing was counted, and the survival rate was calculated according to the equation below. .

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

The results are shown in Table 4. The rice seeds in Table 4 (as a control) represent uncoated rice seeds, and the survival rate of the seeds was 0% due to deprivation by birds such as sparrows.

Test Example 5

Wet gauze was spread on a petri dish made of plastic, and then 20 grains of coated rice seeds were sown on the surface. After covering the Petri dish, it was left standing in a thermostat set at 17°C. After 10 days, the presence or absence of seed germination was examined, and the germination rate was calculated according to the equation below.

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

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 examined by visual observation.

The results are shown in Table 6.

Reference Description

1 shaft

2 Cups made of polyethylene

3 mixer

4 stands

Claims (12)

A coated rice seed having a coating layer, wherein the coating layer contains polyvinyl alcohol, zinc oxide, iron oxide, bentonite, and a surfactant having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%,
Coated rice seeds, wherein the weight ratio of zinc oxide to iron oxide is within the range of 1:200 to 1:3. A coated rice seed having a coating layer, wherein the coating layer contains polyvinyl alcohol, zinc oxide, iron oxide, and bentonite having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%, and the surfactant is at least the coating. It is retained on the surface of rice seeds,
Coated rice seeds, wherein the weight ratio of zinc oxide to iron oxide is within the range of 1:200 to 1:3. Coated rice seeds according to claim 1 or 2, wherein the coating layer has a first layer containing iron oxide and a second layer containing zinc oxide coated on the outside of the first layer. Contains polyvinyl alcohol, zinc oxide, iron oxide, and bentonite having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%,
A powdered composition wherein the weight ratio of zinc oxide to iron oxide is in the range of 1:200 to 1:3. The powdered composition according to claim 4, wherein the average particle size is in the range of 0.01 to 150 μm. 6. The powdered composition of claim 4 or 5, wherein the apparent relative density is in the range of 0.30 to 2.50 g/mL. The powdered composition of claim 4 or 5, wherein the apparent relative density is in the range of 0.30 to 2.0 g/mL. Powdered composition according to claim 4 or 5, wherein the zinc oxide has an average particle size in the range from 0.01 to 100 μm. having polyvinyl alcohol, zinc oxide, iron oxide, bentonite, and a surfactant having a degree of polymerization of at least 500 or more and a degree of saponification in the range of 71.0 to 97.5 mol%,
A kit for the production of coated rice seeds, wherein the weight ratio of zinc oxide to iron oxide is in the range of 1:200 to 1:3. A method for producing coated rice seeds, comprising the following steps:
(1) While moving and rolling the rice seeds, polyvinyl alcohol, zinc oxide, iron oxide, bentonite, and water having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol% are added to form polyvinyl alcohol, zinc oxide, forming a coating layer containing iron oxide and bentonite,
(2) adding a surfactant while moving and rolling the seed obtained in step (1) to retain the surfactant outside the layer formed by step (1), and
(3) drying the seeds obtained in step (2);
A method for producing coated rice seeds, wherein the weight ratio of zinc oxide to iron oxide is within the range of 1:200 to 1:3. A method for producing coated rice seeds, comprising the following steps:
(1) (i) Polyvinyl alcohol, iron oxide, bentonite, and water having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol% are added while moving and rolling the rice seeds to form polyvinyl alcohol, iron oxide, and forming a coating layer containing bentonite, and (ii) adding polyvinyl alcohol, zinc oxide, bentonite, and water to the outside of the layer formed by step (i) while moving and rolling the seeds obtained in step (i). forming a coating layer containing polyvinyl alcohol, zinc oxide, and bentonite;
(2) adding a surfactant while moving and rolling the seed obtained in step (1) to retain the surfactant outside the layer formed by step (1), and
(3) drying the seeds obtained in step (2);
A method for producing coated rice seeds, wherein the weight ratio of zinc oxide to iron oxide is within the range of 1:200 to 1:3. Coated rice seeds produced by the method for producing coated rice seeds according to claim 10 or 11.