KR20230021178A - Coated rice seed and method for producing same - Google Patents

Abstract

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

Description

Coated rice seed and its manufacturing method {COATED RICE SEED AND METHOD FOR PRODUCING SAME}

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

Paddy rice direct sowing cultivation refers to a cultivation method by sowing rice seeds directly into a paddy field, and this method has the advantage of relieving farming because it does not require some seedling and transplanting work. On the other hand, this method has a disadvantage that it is weak against deliquescence, i.e., deliquescence by birds such as ducks and sparrows. A decrease in seedling composition rate due to deliquescence resulted in a decrease in yield, so a strategy to avoid deliquescence was desired. 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 according to the type of algae (see, for example, Non-Patent Document 1).

In addition, iron-coated flooding direct sowing is known as a technological way to prevent eating by sparrows by coating rice seeds with iron powder to inhibit the floating of seeds 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 the oxidation of iron, there are some cumbersome things in the management of coated rice seeds, such as the need to release heat generated by oxidation, and management is difficult. If not sufficient, there are some problems such as a decrease in 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).

list of citations

patent literature

Patent Document 1: JP 2013-146266 A1

non-patent literature

Non-Patent Document 1: Nagao SAKAI et al. 3, "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.

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

The present inventors diligently researched and found the coated rice seeds, and as a result, rice seeds coated with 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%. It was found that sowing in paddy field made it possible to ensure sufficient seedling composition rate in paddy rice direct sowing cultivation due to reduced deliquescence.

The present invention is as follows.

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

[2] A coated rice seed 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 a range of 71.0 to 97.5 mol%, and a surfactant is at least Coated rice seeds held on the surface.

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

Group (A): The 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 outside 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 outside the first layer.

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

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

Group (A): The 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 producing coated rice seeds having polyvinyl alcohol having a degree of polymerization of at least 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%, zinc oxide, bentonite, and a surfactant.

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

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

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

[17] A method for producing coated rice seeds comprising the following steps:

(1) 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 following group (A), and water are added while moving rice seeds to obtain poly Forming a coating layer containing vinyl alcohol, zinc oxide, bentonite, and at least one selected from group (A) below;

(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);

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

[18] A 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 following group (A), and water are added to polyvinyl while moving and rolling rice seeds Forming a coating layer containing alcohol, bentonite, and at least one selected from the following group (A), and (II) moving and rolling the seeds obtained in step (I) to polyvinyl alcohol, zinc oxide, bentonite, and adding water to form a coating layer containing polyvinyl alcohol, 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);

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

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

[20] A method for producing coated rice seeds comprising the following steps:

(1) 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%, while moving and rolling rice seeds, to obtain polyvinyl alcohol, zinc oxide, forming a coating layer containing iron oxide and bentonite;

(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).

[21] A method for producing coated rice seeds comprising the following steps:

(1) (i) adding 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% while moving and rolling rice seeds to obtain polyvinyl alcohol, iron oxide, and forming a coating layer containing bentonite, and (ii) adding polyvinyl alcohol, zinc oxide, bentonite, and water while moving and rolling the seeds obtained in step (i) to the outside of the layer formed by step (I). forming a coating layer containing polyvinyl alcohol, zinc oxide, and bentonite;

(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).

[22] Coated rice seeds prepared 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 decrease in germination rate, and ensure sufficient seedling composition ratio in paddy rice direct sowing cultivation.

[Figure 1] An exemplary view of a simple seed coater used for coating rice seeds in an embodiment.

The coated rice seed of the present invention (hereinafter referred to as "this rice seed") has a coating layer, wherein the coating layer is 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% (hereinafter referred to as "this rice seed"). PVA"), zinc oxide, bentonite, and a surfactant, or 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 seed as used herein refers to the seed of a commonly cultivated rice variety.

Examples of varieties include species such as Japonica subspecies and Indica subspecies, and varieties having high lodging resistance and high germination rate are preferred.

As used herein, the present PVA means a polymer compound having a structure represented by the following formula (1), wherein 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 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 calculating 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 within the range of 1000 to 2500, still more preferably 1500 to 2500. The degree of saponification of polyvinyl alcohol as used herein 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 from 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, and examples of this commercially available PVA are 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.) ), including

Powdered polyvinyl alcohol as used herein is preferably used, and polyvinyl alcohol having a particle size distribution in which the content of particles having a size of 180 μm or more is 0.5% or less is preferably used. As used herein, "particle size distribution of polyvinyl alcohol" means a particle size distribution measured using a sieving method, and as used herein, "content of particles having a size of 180 μm or larger is 0.5 % or less" indicates that the weight ratio of the amount remaining on 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 alcohol on a 180 μm aperture sieve (a test sieve defined by Japanese Industrial Standard (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 with a sieving device such as a ro-tap shaker for 10 minutes, the weight of the polyvinyl alcohol remaining on the sieve was weighed, and the particle size was determined according to the following equation. It can be obtained by calculating the distribution.

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

The content of this PVA in this rice seed is usually in the range of 0.01 to 5 wt%, preferably in the range of 0.01 to 3 wt%, more preferably in the range of 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 oxide include zinc oxide 3N5 (manufactured by KANTO CHEMICAL CO., INC.) and zinc oxide second grade (manufactured by NIPPON CHEMICAL INDUSTRIAL CO., LTD.). Zinc oxide as used herein preferably has a purity of at least 99% (wt % relative to the zinc oxide). The purity of zinc oxide is measured by the test procedure specified in K1410 of Japanese Industrial Standards (JIS). Additionally, powdered zinc oxide is usually used, and the average particle size of zinc oxide is 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 a 50% accumulation in a volume-based frequency distribution. The average particle size of zinc oxide can be measured by a method of measuring with a Mastersizer 2000 (manufactured by Malvern Instruments Ltd) as a laser diffraction/scattering type particle size distribution analyzer after dispersing particles of zinc oxide in water, that is, a wet measurement method. can

The content of zinc oxide in this rice seed is usually in the range of 0.005 to 80 wt%, preferably 0.05 to 70 wt%, more preferably 0.1 to 50 wt%. From the viewpoint of plant growth and environmental impact, the range of 0.1 to 15 wt% is preferable.

Bentonite as used herein means a clay composed primarily of sodium bentonite containing sodium ions as the predominant cation in the middle layer of montmorillonite, and calcium bentonite containing calcium ions as the predominant cation in the middle layer of montmorillonite. Bentonite is commercially available, and examples of commercially available bentonite include bentonite 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 having a particle size distribution in which the content of particles having a size of 75 μm or more is 20% or less 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 in which the content of particles having a size of 75 μm or greater is less than or equal to 20%" "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 was measured by placing 10 g of bentonite on a 75 μm aperture sieve (a test sieve defined by Japanese Industrial Standard (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 bentonite for 10 minutes with a sieving device such as a low-tap shaker, then weighing the weight of the bentonite remaining on the sieve, and calculating the particle size distribution according to the following equation.

Residual amount on sieve (%) = weight of bentonite remaining on sieve (g) / weight of bentonite initially placed on 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%, more preferably 0.1 to 3 wt%.

Surfactant as used herein is 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. Further, the polyoxyethylene aryl phenyl ether is preferably polyoxyethylene polystyryl phenyl ether, and the sulfonate is preferably naphthalenesulfonate and its formaldehyde condensate, phenolsulfonate and its formaldehyde condensate, and It is at least one selected from the group consisting of no sulfonates.

Polyoxyethylene alkyl ethers include polyoxyethylene stearyl ether and polyoxyethylene tridodecyl ether. Polyoxyethylene polystyryl phenyl ether includes polyoxyethylene tristyrylphenyl ether. Naphthalenesulfonates and their formaldehyde condensates include the formaldehyde condensates of sodium naphthalenesulfonate, phenolsulfonates and their formaldehyde condensates include the formaldehyde condensates of sodium phenolsulfonate, and lignosulfonates contains 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.).

A powdered surfactant as used herein is preferably used, and a surfactant having a particle size distribution in which the content of particles having a size of 100 μm or more is 2% or less is preferably used. As used herein, “particle size distribution of surfactant” refers to a particle size distribution measured using the sieving method, and as used herein, “particle size in which the content of particles having a size of 100 μm or larger is less than or equal to 2%” "Having a distribution" indicates that the weight ratio of the amount remaining on the 100 μm aperture sieve to the total amount is 2% or less. The particle size distribution of surfactant is 10 g of surfactant on a 100 μm aperture sieve (a test sieve defined by Japanese Industrial Standard (JIS) Z8801-1, the frame of which has a diameter of 200 mm and a depth of 45 mm) After sieving the surfactant with a sieving device, such as a low-tap shaker, for 10 minutes, weighing the weight of the surfactant remaining on the sieve, and calculating the particle size distribution according to the following equation.

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

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

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

Powdered present inorganic compounds as used herein are preferably used, and their average particle size is usually 200 μm or less, preferably 150 μm or less. The average particle size of the present inorganic compound 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 a 50% accumulation in a volume-based frequency distribution. The average particle size of the inorganic compound can be measured by a method of measuring with a Mastersizer 2000 (manufactured by Malvern Instruments Ltd) as a laser diffraction/scattering type particle size distribution analyzer after dispersing the particles of the present inorganic compound in water, that is, a wet measurement method. can

When two or more inorganic compounds selected from group (A) having different average particle sizes are used as the inorganic compounds, 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 seed 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 an insecticidal active ingredient. 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.

A powdered insecticidal active ingredient as used herein is preferably used, optionally mixed with the present inorganic compound, and milled with a mill such as a dry mill to be used as a powdered insecticide. The average particle size of the powdered insecticide is usually 200 μm or less, preferably 150 μm or less. Average particle size of a powdered pesticide as used herein means the particle size measured with a laser diffraction/scattering type particle size distribution analyzer, which is defined as the particle size corresponding to a 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 insecticide can be measured by a method of dispersing the particles of the powdered insecticide in water and then measuring with a Mastersizer 2000 (manufacturer Malvern Instruments Ltd) as a laser diffraction/scattering type particle size distribution analyzer, that is, a wet measurement method. can

When the coating layer contains an insecticidal active ingredient, its content in the present rice seed 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 the colorant include pigments, dyes, and dye products, and pigments are 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 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 "this kit") has the present PVA, zinc oxide, bentonite, and a surfactant, which may be contained in one container, or may be contained in two or more containers there is. That is, the kit may include one or more container(s). Where the kit includes two or more containers, each container may contain a separate component. In addition, the kit may contain other ingredients such as iron oxide, the present inorganic compound, and an insecticidal active ingredient (hereinafter referred to as "component α").

This rice seed is coated with a coating layer containing present PVA, zinc oxide, bentonite, and a surfactant, and optionally containing iron oxide or present inorganic compound (hereinafter referred to as “present coating layer 1”) on the rice seed. or 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 rice seeds, It can be prepared by holding a surfactant on the surface of this coating layer 2.

The present coating layer 1 is formed by carrying out a step of adding the present PVA, zinc oxide, bentonite and surfactant, and optionally iron oxide or present inorganic compound to adhere them to the rice seed while moving and rolling the rice seed. The present coating layer 2 is formed by carrying out a step of adding the present PVA, zinc oxide and bentonite, and optionally iron oxide or the present inorganic compound to adhere them to the rice seeds while moving and rolling the rice seeds. As a device for moving and rolling rice seeds, a device 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 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 mixed and used, a powdered composition containing the present PVA, zinc oxide, bentonite, and a surfactant, and optionally iron oxide or the present inorganic compound is used. When two or more of the components are mixed and used, 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. Further, when component α is used, component α may be used alone or added to a powdered composition containing the present PVA, zinc oxide and bentonite, and optionally iron oxide or the present inorganic compound and used there is.

After forming the present coating layer 2 using a powdered composition containing the present PVA, zinc oxide, and bentonite (hereinafter referred to as “powdered composition Z”) and a surfactant, having a surfactant on the surface thereof The way to do it is described below.

The present coating layer 2 is formed on the rice seeds by adding the powdered composition Z and water while moving and rolling the rice seeds. The present 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 on at least its surface, and the retention of the surfactant on the surface retains the state of moving and rolling the rice seed after forming the present coating layer 2 on the rice seed. This is achieved by attaching the surfactant to the outside of the present coating layer 2 by adding a surfactant while doing so.

When using the present inorganic compound, the present inorganic compound and the powdered composition Z may be mixed and added in the above-mentioned method, or the present PVA, bentonite, and a powdered composition containing the present inorganic compound (hereinafter referred to as “powdered 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 outside the first layer are firstly added with the powdered composition Y, then powdered It can be manufactured by adding the chemical composition Z. Specifically, while rice seeds are moved and rolled, the powdered composition Y and water are added to form a first layer containing the present inorganic compound, the present PVA, and bentonite, and the rice seeds are moved and rolled with the powdered composition Z and water is added while retaining to form a second layer containing zinc oxide, present PVA, and bentonite outside the first layer.

A powdered composition containing the present 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 present composition (1) is within the range of 0.01 to 150 μm, preferably 1 to 150 μm, more preferably 5 to 150 μm. The average particle size of the present composition (1) 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. do. The average particle size of the present composition (1) is measured with a Mastersizer 2000 (manufactured by Malvern Instruments Ltd) as a laser diffraction/scattering type particle size distribution analyzer after dispersing the particles of the present composition (1) in water, namely wet measurement method can be measured.

The apparent relative density of the present composition (1) is, for example, within the ranges 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 present composition (1) is preferably high because scattering is prevented in the production of coated rice seeds. As used herein, the apparent relative density of the present composition (1) is measured by a method according to a test procedure stipulated in the Official Analysis Method for Pesticides (Physical Test, Ministry of Agriculture and Forestry Notice No. 71 of February 3, 1985) do. An 8-mesh standard sieve (as defined in Z8801-1 of Japanese Industrial Standards (JIS), whose frame has a diameter of 200 mm and a depth of 45 mm) on a cylindrical container of 100 mL capacity made of metal with an inner diameter of 50 mm test sieve), place the sample in the sieve, and lightly brush it to fill the container. Thereafter, the excess sample is immediately rubbed off using a slide glass, the sample is weighed to determine the weight of the contents, and the apparent relative density is calculated according to the following equation. The distance between the sieve and the upper side of the container is set as 20 cm.

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

The present composition (1) may contain the present inorganic compound. When the present composition (1) contains the present inorganic compound, the weight ratio of zinc oxide to the present inorganic compound in the present 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 environmental impact, a range of 1:200 to 1:3 is preferred.

After forming the present coating layer 2 using the powdered composition containing the present PVA, zinc oxide, iron oxide, and bentonite (hereinafter referred to as “powdered composition T”) and a surfactant, the surfactant was Methods of holding on the surface are described below.

The present coating layer 2 is formed on the rice seeds by adding the powdered composition T and water while moving and rolling the rice seeds. The present 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 retains the state of moving and rolling the rice seed after forming the present coating layer 2 on the rice seed. This is achieved by attaching the surfactant to the outside of the present coating layer 2 by adding a surfactant while doing so.

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 outside the first layer, , can be prepared by first adding the present PVA and then adding zinc oxide. Specifically, while rolling rice seeds, a powdered composition containing iron oxide and present PVA and water are added to form a first layer containing iron oxide and present PVA, and the state of rolling rice seeds is maintained while adding the powdered composition containing zinc oxide and the present PVA, and water to form a second layer containing zinc oxide and the present PVA outside the first layer.

A powdered composition containing the present PVA, zinc oxide, iron oxide, and bentonite (hereinafter sometimes referred to as “present composition (2)”) is suitable as a powdered composition for coating rice seeds. The average particle size of the present composition (2) is within the range of 0.01 to 150 μm, preferably 1 to 150 μm, more preferably 1 to 60 μm. The average particle size of the present composition (2) 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 a 50% accumulation in a volume-based frequency distribution. do. The average particle size of the present composition (2) is measured with a Mastersizer 2000 (manufactured by Malvern Instruments Ltd) as a laser diffraction/scattering type particle size distribution analyzer after dispersing the particles of the present composition (2) in water, namely wet measurement method can be measured.

The apparent relative density of the present composition (2) is, for example, within the ranges 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 present composition (2) is preferably high because scattering is prevented in the production of coated rice seeds. As used herein, the apparent relative density of the present composition (2) is measured by a method according to a test procedure stipulated in the Official Analysis Method for Pesticides (Physical Test, Ministry of Agriculture and Forestry Notice No. 71, February 3, Showa 35) do. An 8-mesh standard sieve (as defined in Z8801-1 of Japanese Industrial Standards (JIS), whose frame has a diameter of 200 mm and a depth of 45 mm) on a cylindrical container of 100 mL capacity made of metal with an inner diameter of 50 mm test sieve), place the sample in the sieve, and lightly brush it to fill the container. Thereafter, the excess sample is immediately rubbed off using a slide glass, the sample is weighed to determine the weight of the contents, and the apparent relative density is calculated according to the following equation. The distance between the sieve and the upper side of the container is set as 20 cm.

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

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

Some examples of the present composition (1) are described as follows. In the following examples, % 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 within 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 of 0.01 to 150 μm and apparent relative density of 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 within the range of 86.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of clays and calcium carbonate, wherein the average The 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 within 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 The 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 500 to 3000 and a degree of saponification within the range of 78.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of pyrophyllite and calcium carbonate, wherein 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 within the range of 86.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of pyrophyllite and calcium carbonate, wherein 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 within the range of 86.5 to 97.5 mol%, bentonite, and at least one selected from the group consisting of pyrophyllite and calcium carbonate, wherein Average particle size is 5 to 150 μm, apparent relative density is 0.60 to 1.7 g/mL;

A powdered composition comprising 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 having a degree of polymerization of 1500 to 2500 and a degree of saponification within the range of 86.5 to 97.5 mol%, 1 to 5% of bentonite, and 32 to 98% of calcium carbonate A powdered composition comprising an average particle size of 5 to 50 μm and an apparent relative density of 0.80 to 1.5 g/mL;

2 to 50% zinc oxide, 0.5 to 3% polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification within the range of 87.0 to 89.0 mol%, 1 to 5% bentonite, and 42 to 86.5% calcium carbonate A powdered composition having 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% of zinc oxide, 1.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification within the range of 87.0 to 89.0 mol%, 2.4% of bentonite, and 48.3% of calcium carbonate, wherein the average particle size is 16.4 μm;

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

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

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

1 to 15% of zinc oxide, 0.5 to 3% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification within the range of 87.0 to 89.0 mol%, 1 to 5% of bentonite, and 77 to 97.5% of phyllite A powdered composition having 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% of zinc oxide, 1.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification within the range of 87.0 to 89.0 mol%, 2.4% of bentonite, and 87% of phyllite, wherein the average Particle size is 22.5 μm.

Some examples of the present composition (2) are described as follows. In the following examples, % 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, an apparent relative density of 0.50 to 2.20 g/mL;

0.5 to 3% of polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification within the range of 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 having an average particle size of 5 to 60 μm and an apparent relative density of 1.00 to 2.20 g/mL;

0.5 to 3% of polyvinyl alcohol having a degree of polymerization of 1000 to 2500 and a degree of saponification within the range of 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 having an average particle size of 15 to 50 μm and an apparent relative density of 1.20 to 2.20 g/mL;

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

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

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

A method for producing this rice seed (hereinafter referred to as "this production method") is described. In this production method, rice seeds are usually soaked before use. Soaking can be achieved as follows. First, dry rice seeds are placed in a bag such as a seed rice bag and immersed in water. The seeds are soaked in water, preferably at 15 to 20°C for 3 to 4 days, to produce coated rice seeds with high germination rates. After the rice seeds are recovered from the water, they are usually left to stand or 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 a surfactant is retained on the surface of the layer (hereinafter referred to as "present production method 1" ) is described. This production method 1 includes the following steps.

(1) adding the present PVA, zinc oxide, bentonite, the present inorganic compound, and water while moving the rice seeds to form a coating layer containing the present PVA, zinc oxide, bentonite, and the present 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 to do.

In the present production method 1, first, while moving and rolling the soaked rice seeds, a powdered composition containing the present PVA, zinc oxide, bentonite, and the present inorganic compound (hereinafter referred to as “powdered composition X”), and water is added to form a coating layer containing the present PVA, zinc oxide, bentonite, and the present inorganic compound (hereinafter referred to as "Step 1"). In step 1, water may be added first, then powdered composition X may be added, and the order may be reversed. Additionally, water and powdered composition X may be added simultaneously. While adding water and the powdered composition X, the rice seeds are kept in contact while rolling. Methods for adding water may include dripping and spraying. After addition of water and powdered composition X, by using the present PVA as a binder, zinc oxide, bentonite, and the present inorganic compound are adhered to the rice seed while maintaining a rolling state.

In the present production method 1, the total amount of zinc oxide added is usually within 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 environmental impact, the preferred range is 0.1 to 25 parts by weight. The total amount of the inorganic compound added is usually within 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 amount of powdered composition X added is usually in the range of 5 to 500 parts by weight, preferably 5 to 300 parts by weight, 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 within the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, 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 X is usually within the range of 1:200 to 1:10, preferably 1:150 to 1:20.

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 powdered composition X is usually about 1 to 1/10, preferably about 1/2 to 1/5 of the total amount of powdered composition X added. The total added amount of water is usually about 1/2 to 1/100, preferably about 1/3 to 1/10 of the total added amount of the powdered composition X.

In step 1, when the powdered composition X sticks to the inner wall of the apparatus, approximately the entire amount of the powdered composition X to be added can be adhered to the rice seeds by scraping the powdered composition X with a scraper or the like.

After performing step 1, a step of adding a surfactant while moving and rolling the seeds 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 the performance of step 1, adding the surfactant while moving and maintaining the rolling state of the rice seeds retains 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 carried out to obtain the present seeds. Specifically, after performing step 2, the rice seeds are retrieved from the apparatus and placed in a nursery box, where they are spread thinly and left to dry. Rice seeds are usually dried to a water content of 20% or less (wt% relative to coated rice seeds). The water content of coated rice seeds as used herein refers to a value measured by drying a 10 g sample at 105° C. for 1 hour using an infrared moisture meter. FD-610 (manufactured by Kett Electric Laboratory) can be used as an infrared moisture meter. Additionally, a mat or plastic sheet may be used instead of a nursery box, spread thinly on it 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 outside the first layer, and a surfactant is retained on its surface; A method for producing coated rice seeds having a coating layer containing bentonite and the present inorganic compound (hereinafter referred to as “present production method 2”) is described. This manufacturing method 2 includes the following steps.

(1) (I) adding this PVA, bentonite, this inorganic compound, and water while moving and rolling rice seeds to form a coating layer containing this PVA, bentonite, and this inorganic compound, and (II) step (I ) adding the present PVA, zinc oxide, bentonite, and water while moving the seeds obtained in step (I) to form a coating layer containing the present 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 to do.

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

In the present production method 2, the total amount of iron oxide added is usually within 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 viewpoints of plant growth and environmental impact, the range of 0.1 to 25 parts by weight is preferred. The total amount of the inorganic compound added is usually within 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 amount of powdered composition V added is usually within 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 the powdered composition W added is usually within the range of 5 to 250 parts by weight, preferably 5 to 200 parts by weight, more preferably 5 to 150 parts by weight, based on 100 parts by weight of dry rice seeds. The total amount of this PVA added is usually within the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, 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 V is usually within the range of 1:200 to 1:10, preferably 1:150 to 1:20. The weight ratio of the present PVA to the powdered composition W is usually within the range of 1:200 to 1:10, preferably 1:1500 to 1:20.

After carrying out step II, steps 2 onwards of the present manufacturing method 1 are carried out similarly.

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

(1) adding this PVA, zinc oxide, iron oxide, bentonite, and water while moving and rolling the rice seeds to form this coating layer 2, (2) moving and rolling the rice seeds obtained in step (1) to form the interface adding an active agent to retain the surfactant outside the coating layer formed by step (1), and (3) drying the rice seeds obtained in step (2).

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

In the present production method 3, the total amount of zinc oxide added is usually within 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 environmental impact, the preferred range is 0.1 to 25 parts by weight. The total amount of iron oxide added is usually within 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 amount of powdered composition T added is usually within the range of 5 to 500 parts by weight, preferably 5 to 300 parts by weight, 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 within the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, 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 within the range of 1:200 to 1:10, preferably 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 amount of the powdered composition T added. The total added amount of water is usually about 1/2 to 1/100, preferably about 1/3 to 1/10 of the total added amount of the powdered composition T.

In step 1', when the powdered composition T sticks to the inner wall of the apparatus, approximately the entire amount of the added powdered composition T can be adhered to the rice seeds by scraping 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 the performance of Step 1', adding the surfactant while moving the rice seeds while retaining the rolling state enables retention of the surfactant outside the present coating layer 2.

After carrying out step 2', a step of drying the seed obtained in step 2' is carried out to obtain this rice seed. Specifically, after performing step 2', the rice seeds are retrieved from the apparatus and placed in a nursery box, where they are spread thinly and left to dry. Rice seeds are usually dried to a water content of 20% or less (wt% relative to coated rice seeds). The water content of coated rice seeds as used herein refers to a value measured by drying a 10 g sample at 105° C. for 1 hour using an infrared moisture meter. FD-610 (manufactured by Kett Electric Laboratory) can be used as an infrared moisture meter. Additionally, a mat or plastic sheet may be used instead of a nursery box, spread thinly on it and left to dry.

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

(1′) (i) adding the present PVA, iron oxide, bentonite, and water while moving and rolling the rice seeds to form a coating layer containing the present PVA, iron oxide, and bentonite, and (ii) step ( adding the present PVA, zinc oxide, bentonite, and water while moving the seeds obtained in i) to form a coating layer containing the present 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') step (2') Drying the seeds obtained in

In the present production method 4, first, while moving and rolling the soaked rice seeds, a powdered composition containing the present PVA, iron oxide, and bentonite (hereinafter referred to as "powdered composition S") and water are added to 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 present preparation method 4, except that powdered composition S is used instead of powdered composition T. After performing step i, while moving and rolling the seeds obtained in step i, a powdered composition containing the present PVA, zinc oxide, and bentonite (hereinafter referred to as "powdered composition R") and water are added to step A step of forming a coating layer containing the present PVA, zinc oxide, and bentonite on the outside of the layer formed by i (hereinafter referred to as "step ii") is performed. Step ii can be carried out according to a procedure similar to step i, except that powdered composition R is used instead of powdered composition S.

In the present production method 4, the total amount of zinc oxide added is usually within 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 viewpoints of plant growth and environmental impact, the range of 0.1 to 25 parts by weight is preferable. The total amount of iron oxide added is usually within 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 amount of powdered composition S added is usually within the range of 5 to 250 parts by weight, preferably 5 to 150 parts by weight, 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 within 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 within the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, 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 within the range of 1:200 to 1:10, preferably 1:150 to 1:20. The weight ratio of the present PVA to the powdered composition R is usually within the range of 1:200 to 1:10, preferably 1:150 to 1:20.

After carrying out step II, steps 2' onwards of the present manufacturing method 3 are similarly carried out.

The present rice seeds can be used in paddy rice direct sowing cultivation, and the method is carried out by directly sowing the present rice seeds in paddy fields. Paddy field as used herein refers to either a freshwater paddy field or a flooded paddy field. Specifically, seeding is carried out 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 (manufactured by Kubota Corporation) can be used. Sowing by the conventional method makes it possible to achieve a good seedling composition. After sowing, maintaining normal cultivation conditions enables rice cultivation.

Pesticides and fertilizers can be applied before sowing, simultaneously with sowing, or after sowing. Pesticides include fungicides, insecticides, and herbicides, and the like.

Example

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

First, production examples and comparative production examples are described.

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

In addition, the trade names used in Production Examples and Comparative Production Examples are as follows.

LPZINC-20: zinc oxide, manufactured by Sakai Chemical Industry Co., Ltd., average particle size; 27.4 μm

Zinc Oxide 3N5: Zinc Oxide, manufactured by KANTO CHEMICAL CO., INC., average particle size; 7.7 μm

Zinc Oxide Grade 2: Zinc Oxide, manufactured by NIPPON CHEMICAL INDUSTRIAL CO., LTD., average particle size; 0.24 μm

Calcium Carbonate G-100: Calcium carbonate, manufactured by 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, manufacturer Sun Zeolite Industry Co., Ltd., average particle size; 116 μm

SHOKOZAN CLAY S: Chlorophyllite, manufacturer SHOKOZAN MINING Co., Ltd.

Bentonite HOTAKA: Montmorillonite, manufactured by HOJUN Co., Ltd.

DAE1K: iron powder, manufactured by DOWA IP CREATION CO., LTD.

KTS-1: Plaster of Paris, manufacturer 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, manufacturer 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, manufactured by TOHO Chemical Industry Co., Ltd.

Preparation Example 1

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

Thereafter, 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 a powdered composition (1).

About 100 mL of water was poured into a 200 mL capacity cup made of polyethylene, and 20 g of dry rice seeds were added thereto, followed by soaking for 10 minutes. Thereafter, the rice seeds were recovered from the water, excess water adhering on the surface was removed, and then the rice seeds were loaded into a cup 2 made of polyethylene fixed to the fabricated simple seed coater. After moving and rolling the rice seeds by operating the simple seed coater in the mixer (3) within a rotational speed range of 130 to 140 rpm, about 1/4 of 2.45 g of the powdered composition (1) was sprayed on the rice seeds with a sprayer (about 0.6 g) was added to the rice seeds to adhere the powdered composition (1) to the rice seeds. When the powdered composition (1) sticks to the inner wall of the cup (2) made of polyethylene, attach approximately the entire amount of the single addition powdered composition (1) to rice seeds by scraping the powdered composition (1) with a spatula made it By repeating the similar method three times, 2.45 g of the powdered composition (1) was adhered to rice seeds to form a coating layer. The total amount of water used for coating was 2.4 g. Then, 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 so as not to overlap, and dried overnight to obtain coated rice seeds (1) of the present invention.

Preparation Example 2

2 g of zinc oxide grade 2, 0.1 g of KURARAY POVAL PVA-205S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdered composition (2).

The following method was performed according to the method described in Preparation Example 1. By using 2.35 g of the 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (2) were obtained. The total amount of water used for coating was 0.5 g.

Preparation Example 3

A powdered composition (3) was obtained by mixing 10 g of LPZINC-20, 0.1 g of KURARAY POVAL PVA-224S, and 0.25 g of bentonite HOTAKA.

The following method was performed according to the method described in Preparation Example 1. By using 10.35 g of the 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (3) were obtained. The total amount of water used for coating was 1.4 g.

Production Example 4

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 were mixed to obtain a powdered composition (4). 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (4) were obtained. The total amount of water used for coating was 2.8 g.

Preparation Example 5

10 g of zinc oxide 3N5, 10 g of granular calcium carbonate, 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (5) were obtained. The total amount of water used for coating was 5.6 g.

Preparation Example 6

20 g of zinc oxide 3N5, 20 g of granular calcium carbonate, 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (6) were obtained. The total amount of water used for coating was 10.3 g.

Preparation Example 7

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 were mixed to obtain a powdered composition (7). 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (7) were obtained. The total amount of water used for coating was 1.4 g.

Preparation Example 8

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 were mixed to obtain a powdered composition (8). 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (8) were obtained. The total amount of water used for coating was 4.2 g.

Preparation Example 9

A 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (9) were obtained. The total amount of water used for coating was 2.4 g.

Preparation Example 10

0.1 g of zinc oxide grade 2, 9.9 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdered composition (10). 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (10) were obtained. The total amount of water used for coating was 2.3 g.

Preparation Example 11

70.0 parts by weight of (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroguanidine (common name: clothianidin) and 30.0 parts by weight of SHOKOZAN CLAY S was mixed and milled with a centrifugal mill to obtain powdered pesticide A. The average particle size of the powdered pesticide A measured by the wet measurement method using Mastersizer 2000 (manufacturer Malvern Instruments Ltd) is 13.0 μm. 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 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 adhered to the outside of the coating layer according to the present invention of coated rice seeds (11) were obtained. The total amount of water used for coating was 3.9 g.

Preparation 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 a powdered composition (12).

The following method was performed according to the method described in Preparation Example 1. By using 10.36 g of the powdered composition (12) instead of 2.45 g of the powdered composition (1), the coated rice seed (12) of the present invention was 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.

Preparation 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). Further, 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 the powdered composition (13-1) was added to the rice seeds while spraying water with a sprayer to adhere the composition to the rice seeds. . When 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 scraped off 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 adhered to 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, 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 under the condition of moving and rolling the rice seeds while maintaining the operation of the simple seed coater to adhere the composition to the outside of the first layer. When 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 scraped off 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 adhered to the outside of the first layer to form a second coating layer containing zinc oxide on the outside of the first layer (hereinafter referred to as “the second 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 the simple seed coater, 0.1 g of SORPOL5080 was added to the rice seeds to adhere to the outside of the second layer. The rice seeds recovered from the simple seed coater were spread on a stainless steel tray so as not to overlap, and dried overnight to obtain coated rice seeds 13 of the present invention.

Preparation Example 14

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 were mixed to obtain a powdered composition (14). The average particle size of the powdered composition 14 is 11.6 μm.

About 100 mL of water was poured into a 200 mL capacity cup made of polyethylene, and 20 g of dry rice seeds were added thereto, followed by soaking 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 to the fabricated simple seed coater. After moving and rolling the rice seeds by operating the simple seed coater in the mixer 3 at a rotation speed of 130 to 140 rpm, about 1/4 of 10.35 g of the powdered composition 14 (about 2.6 g) was added to the rice seeds to adhere the powdered composition (14) to the rice seeds. When the powdered composition 14 sticks to the inner wall of the cup 2 made of polyethylene, scraping the powdered composition 14 with a spatula to attach approximately the entire amount of the single addition powdered composition 14 to the rice seeds made it By repeating the similar method three times, 10.35 g of the powdered composition (14) was adhered to rice seeds to form a coating layer. The total amount of water used for coating was 1.7 g. Then, 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 stainless steel trays without overlapping and dried overnight to obtain coated rice seeds 14 of the present invention.

Preparation 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 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 adhered to the outside of the coating layer according to the present invention of coated rice seeds (15) were obtained. The total amount of water used for coating was 3.5 g.

Preparation Example 16

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 were mixed to obtain a powdered composition (16). 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 powdered composition (16) 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (16) were obtained. The total amount of water used for coating was 1.9 g.

Preparation Example 17

1 g of zinc oxide grade 2, 9 g of iron oxide, 0.1 g of GOHSENOL GM-14S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdered composition (17). 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (17) were obtained. The total amount of water used for coating was 2.1 g.

Preparation Example 18

1 g of zinc oxide grade 2, 9 g of iron oxide, 0.1 g of KURARAY POVAL PVA-224S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdered composition (18). 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 powdered composition (18) 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (18) were obtained. The total amount of water used for coating was 2.0 g.

Preparation Example 19

2 g of zinc oxide grade 2, 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 a 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 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 adhered to the outside of the coating layer according to the present invention. of coated rice seeds (19) were obtained. The total amount of water used for coating was 0.6 g.

Production Example 20

0.5 g of zinc oxide grade 2, 9.5 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdered composition (20). 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 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 adhered to the outside of the coating layer according to the present invention. of 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 of (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroguanidine (common name: clothianidin) and 30.0 parts by weight of SHOKOZAN CLAY S was mixed and milled with a centrifugal mill to obtain powdered pesticide B. The average particle size of the powdered pesticide B measured by the wet measurement method using Mastersizer 2000 (manufacturer Malvern Instruments Ltd) is 13.0 μm.

A 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 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 adhered to the outside of the coating layer according to the present invention. of 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).

Further, 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, the rice seeds were moved and rolled using a simple seed coater, and then about 1/4 (about 2.3 g) of 9.315 g of the powdered composition (22-1) was applied while spraying water with a sprayer. The composition was adhered to rice seeds by adding to rice seeds. When 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 scraped off 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 adhered to 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, 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 under the condition of moving and rolling the rice seeds while maintaining the operation of the simple seed coater to adhere the composition to the outside of the first layer. When 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 scraped off 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 adhered to the outside of the first layer to form a second coating layer containing zinc oxide (hereinafter referred to as "the 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 the simple seed coater, 0.1 g of SORPOL5080 was added to the rice seeds to adhere to the outside of the second layer. The rice seeds recovered from the simple seed coater were spread on stainless steel trays without overlapping and dried overnight to obtain coated rice seeds 22 of the present invention.

Comparative Preparation Example 1

11 g of iron mixture A was obtained by mixing 10 g of DAE1K and 1 g of KTS-1.

The following method was performed according to the method described in Preparation Example 1. Dip 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 with a dropper to obtain an iron mixture A was attached to rice seeds. When the iron mixture A adhered to the inner wall of the cup 2 made of polyethylene, approximately the entire amount of the single-added iron mixture A was adhered to the rice seeds by scraping off the iron mixture A with a spatula. By repeating the similar method three times, 11 g of the iron mixture A was adhered to the rice seeds to form a coating layer. The total amount of water used for coating was 1.9 g. Then, 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. After the rice seeds recovered from the simple seed coater were spread on a stainless steel tray so as not to overlap, water was sprayed on the rice seeds three times for two days to accelerate the oxidation of iron, and then the rice seeds were dried overnight to coat for comparison. Rice seeds (I) were obtained.

Next, test examples are shown.

Test Example 1

A Petri dish made of plastic is filled with about 30 g of soil, moistened with water, and then 50 grains of coated rice seeds are sown on the soil surface. After leaving the Petri dish in the open air, taking pictures with a time-lapse camera to observe its condition, counting the number of coated rice seeds remaining 1 day after sowing, and then calculating the survival rate according to the following equation .

Residual rate (%) = number of coated rice seeds remaining on day 1 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 eating by birds such as sparrows.

Test Example 2

After wet gauze was spread on a petri dish made of plastic, 20 grains of coated rice seeds were sown on the surface. After covering the Petri dish, it was allowed to stand in a thermostat set at 17° C., and after 10 days, seed germination was examined, and the germination rate was calculated according to the following equation.

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

The results are shown in Table 2.

Test Example 3

Ten grains of coated rice seeds were placed in a Petri dish containing 50 mL of water (water hardness: 3) and allowed to stand at room temperature (about 20° C.). After 30 minutes, the presence or absence of peeling of the coating was checked 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 then 50 grains of coated rice seeds are sown on the soil surface. After leaving the Petri dish in the open air, taking pictures with a time-lapse camera to observe its condition, counting the number of coated rice seeds remaining 1 day after sowing, and then calculating the survival rate according to the following equation .

Residual rate (%) = number of coated rice seeds remaining on day 1 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 eating by birds such as sparrows.

Test Example 5

After wet gauze was spread on a petri dish made of plastic, 20 grains of coated rice seeds were sown on the surface. After covering the Petri dish, it was allowed to stand in a thermostat set at 17° C., and after 10 days, seed germination was examined, and the germination rate was calculated according to the following equation.

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

The results are shown in Table 5.

Test Example 6

Ten grains of coated rice seeds were placed in a Petri dish containing 50 mL of water (water hardness: 3) and allowed to stand at room temperature (about 20° C.). After 30 minutes, the presence or absence of peeling of the coating was checked by visual observation.

The results are shown in Table 6.

reference description

One shaft

2 Cup made of polyethylene

3 mixer

4 stand

Claims (12)

A coated rice seed having a coating layer, wherein the coating layer contains polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification within the range of 71.0 to 97.5 mol%, zinc oxide, iron oxide, bentonite, and a surfactant;
Coated rice seed, 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 wherein the surfactant is at least a coating Retained on the surface of rice seeds,
Coated rice seed, wherein the weight ratio of zinc oxide to iron oxide is within the range of 1:200 to 1:3. 3. The coated rice seed 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 outside the first layer. Containing 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%;
wherein the weight ratio of zinc oxide to iron oxide is in the range of 1:200 to 1:3. 5. 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 according to claim 4 or 5, having an apparent relative density in the range of 0.30 to 2.50 g/mL. 6. The powdered composition according to claim 4 or 5, having an apparent relative density in the range of 0.30 to 2.0 g/mL. 6. A powdered composition according to claim 4 or 5, wherein the average particle size of the zinc oxide is in the range of 0.01 to 100 μm. 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 within 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) 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%, while moving and rolling rice seeds, to obtain polyvinyl alcohol, zinc oxide, forming a coating layer containing iron oxide and bentonite;
(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);
A process for producing 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) (i) adding 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% while moving and rolling rice seeds to obtain polyvinyl alcohol, iron oxide, and forming a coating layer containing bentonite, and (ii) adding polyvinyl alcohol, zinc oxide, bentonite, and water while moving and rolling the seeds obtained in step (i) to the outside of the layer formed by step (i) forming a coating layer containing polyvinyl alcohol, zinc oxide, and bentonite;
(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);
A process for producing coated rice seeds, wherein the weight ratio of zinc oxide to iron oxide is in the range of 1:200 to 1:3. Coated rice seed produced by the method for producing coated rice seed according to claim 10 or 11.

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