KR102458739B1 - Coated rice seed and method for producing same - Google Patents

Abstract

A coated rice seed having a coating layer on the surface of the rice seed, wherein the coating layer contains at least one copolymer selected from the group consisting of calcium carbonate and a styrene-butadiene copolymer and a methyl methacrylate-butadiene-styrene copolymer, The content of the calcium carbonate is 30 to 90% by weight based on 100% by weight of the coated rice seed is disclosed a coated rice seed. Accordingly, it is possible to provide a coated rice seed that is difficult to receive deliquescence and does not have a problem of lowering the germination rate of conventional iron-coated rice seeds.

Description

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

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

Paddy direct sowing (直播) cultivation is a cultivation method in which rice seeds are directly sown in a paddy field, and has the advantage of simplifying farming because there is no need for seedling and transplantation. On the other hand, it has a disadvantage that it is easy to be devoured by birds such as ducks and sparrows. Since the fall of the grain rate due to tidal damage leads to a decrease in imports, measures for preventing tidal damage have been demanded. As an existing anti-tidal wave prevention measure, a method of preventing tidal sea damage by water management has been proposed. However, it is necessary to change the management method according to the type of algae (see, for example, Non-Patent Document 1).

In addition, iron-coated freshwater direct sowing is known as a technique for preventing erosion by sparrows by coating rice seeds with iron to suppress the floating of seeds in the sowing of the soil surface (see, for example, non-patent document 2). However, since this technology uses iron oxidized and solidified, the management of rice seeds after coating is cumbersome, such as the need to dissipate the heat generated during oxidation, and there is a problem that the germination rate is lowered when the management is insufficient. . As a method for solving such a problem, for example, a technique of coating rice seeds using polyvinyl alcohol having a high degree of saponification and a coating material such as iron oxide is known (see Patent Document 1).

Patent Document 1: JP 2013-146266 A1

Non-Patent Document 1: Nagao Sakai, et al., "Measures to prevent tidal damage in freshwater direct sowing of rice", The Hokuriku Crop Science, Japan Crop Society, March 31, 1999, Vol. 34, p . 59-61 Non-Patent Document 2: Minoru Yamauchi, “Iron Coated Rice Freshwater Direct Sowing Manual 2010”, Independent Administrative Organization for Agriculture and Food Industry Technology Comprehensive Research Organization, Kinki Agricultural Research Center, Shikoku, China, March 2010

An object of the present invention is to provide a coated rice seed that is less susceptible to deliquescence and does not have a problem of lowering the germination rate of conventional iron-coated rice seeds.

The present inventors have studied to find coated rice seeds that meet this purpose, and as a result, at least one copolymer selected from the group consisting of calcium carbonate and a styrene-butadiene copolymer and a methyl methacrylate-butadiene-styrene copolymer It was found that coated rice seeds having a coating layer containing

That is, the present invention is as follows.

[1] A coated rice seed having a coating layer on the surface of the rice seed, wherein the coating layer is at least one copolymer selected from the group consisting of calcium carbonate and a styrene-butadiene copolymer and a methyl methacrylate-butadiene-styrene copolymer. It contains, and the content of the calcium carbonate is 30 to 90% by weight based on 100% by weight of the coated rice seed coated rice seed.

[2] The coated rice seed according to [1], wherein the copolymer has a glass transition point of 10°C or less.

[3] A method for producing a coated rice seed comprising the following steps;

(1) At least one copolymer latex selected from the group consisting of calcium carbonate and styrene-butadiene copolymer latex and methyl methacrylate-butadiene-styrene copolymer latex to rice seeds while rolling the rice seeds Adding calcium carbonate to the surface of the rice seeds by adding, and (2) drying the seeds obtained in the above step.

[4] The step (1) is a step of attaching calcium carbonate to the surface of the rice seeds by repeating the steps of adding calcium carbonate and adding the copolymer latex while rolling the rice seeds, [3] ] described in the method.

[5] One-time addition amount of calcium carbonate is 1 to 1/20 of the weight of rice seeds, and the one-time addition amount of the copolymer latex is 1/10 to 1/1000 of the weight of rice seeds in terms of the weight of the copolymer. , the method described in [4].

[6] One-time addition amount of calcium carbonate is 5 to 100 parts by weight based on 100 parts by weight of rice seeds, and the one-time addition amount of the copolymer latex is 0.1 to 10 parts by weight based on 100 parts by weight of rice seeds in terms of the copolymer weight. Madam, the method described in [4].

[7] The method according to any one of [3] to [6], wherein 100 to 1200 parts by weight of calcium carbonate are used with respect to 100 parts by weight of rice seeds.

[8] A coated rice seed produced by the method according to any one of [3] to [7].

[9] A rice cultivation method comprising the step of directly sowing the coated rice seed according to [1], [2] or [8] into a paddy field.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing for demonstrating the preparation method of the measurement sample for the hardness measurement of the coated rice seed of this invention.
[FIG. 2] It is explanatory drawing for demonstrating the hardness measurement method of the coated rice seed of this invention.
[FIG. 3] It is an explanatory diagram for explaining the simple seed coating machine used for the rice seed coating in the Example.

form for carrying out the invention

The coated rice seed of the present invention (hereinafter referred to as "the present coated rice seed") is selected from the group consisting of calcium carbonate and a styrene-butadiene copolymer and a methyl methacrylate-butadiene-styrene copolymer on the surface of the rice seed. and a coating layer containing at least one kind of copolymer (hereinafter referred to as "the present copolymer").

The rice seed used in the present invention refers to a seed of a variety generally cultivated as rice. Examples of the variety include, but are not limited to, japonica species and indica species, but varieties with high wear resistance and high germination rate are preferred.

Commercially available calcium carbonate (CaCO ₃ ) may be used in the present invention. Examples of commercially available calcium carbonate include calcium carbonate manufactured by Sankyo Sewing Co., Ltd., and calcium carbonate manufactured by Nitto Seisaku Kogyo Co., Ltd. Also, in general, powdery calcium carbonate is used, and particles corresponding to cumulative 10%, cumulative 50%, and cumulative 90% on the small-diameter side of the volume-based frequency distribution measured by a laser diffraction/scattering type particle size distribution measuring device. When the size is D10, D50, and D90, respectively, it is preferable to use calcium carbonate having (D90-D10)/D50 in the range of 1.0 to 8.0, and (D90-D10)/D50 in the range of 2.0 to 6.0. use is more preferred. The laser diffraction/scattering type particle size distribution measuring apparatus includes, for example, LA-950V2 (manufactured by HORIBA), and a method of measuring by dispersing calcium carbonate particles in water using the above apparatus, a so-called wet measurement method D10, D50, and D90 can be obtained, respectively.

The content of calcium carbonate relative to 100% by weight of the present coated rice seed is in the range of 30 to 90% by weight. By setting the content of the calcium carbonate to 30% by weight or more, the effect of being less susceptible to deliquescence is exhibited. However, the content of calcium carbonate is preferably in the range of 50 to 90% by weight, 60 to 90% by weight, and 60 to 80% by weight. However, the weight of the present coated rice seed used in the present invention refers to the sum of the weight of the dry rice seed, calcium carbonate, the present copolymer, and optional ingredients before coating, and the optional ingredients are pesticide active ingredients (pesticidally described below). active ingredient), colorants and surfactants.

Styrene-butadiene copolymer is a copolymer composed of styrene and 1,3-butadiene, abbreviated as SBR, and commonly known as synthetic rubber. Likewise, methyl methacrylate-butadiene-styrene copolymers are also commonly known and are terpolymers composed of methyl methacrylate, 1,3-butadiene and styrene, abbreviated as MBS. The SBR used in the present invention can be used as an SBR having a carboxyl group (-COOH) in the molecule (hereinafter referred to as "carboxy-modified SBR"), and MBS is MBS having a carboxyl group (-COOH) in the molecule (hereinafter, " carboxy-modified MBS"). In addition, the glass transition point (Tg) of the present copolymer is generally 10°C or less, preferably -50°C to 10°C, more preferably -30°C to 0°C.

This copolymer used in the present invention is used in the form of latex. Latex is a dispersion of polymer fine particles, and the average particle size of the fine particles is generally 1 μm or less. The average particle size of the polymer particles of the latex used in the present invention is measured by a laser diffraction/scattering type particle size distribution measuring device, and refers to a particle size that is 50% of the cumulative frequency in the volume-based frequency distribution. In addition, the content of the polymer (solid content) of the latex is usually about 40 to 70% (weight% with respect to the latex). Commercially available SBR latex and MBS latex may be used as the copolymer latex, and as such commercially available SBR latex and MBS latex, for example, Narusta SR103 (carboxy-modified SBR latex, Tg; 7 ℃, Eiando, Japan) Luo Co., Ltd.) and Narusta SR140 (carboxy-modified SBR latex, Tg; -12 degreeC, Japan Eiando Eru Co., Ltd. make) are mentioned.

The content of the present copolymer relative to 100% by weight of the present coated rice seed is generally in the range of 0.1 to 6% by weight, preferably 0.25 to 6% by weight, 1 to 6% by weight, and 2 to 4% by weight.

The coating layer may contain an agrochemical active ingredient. The agrochemical active ingredient includes, for example, an insecticidal active ingredient, a bactericidal active ingredient, an herbicidal active ingredient, and a plant growth regulating active ingredient.

Insecticidally active ingredients include, for example, clothianidin, imidacloprid and thiamethoxam.

Bactericidal active ingredients include, for example, isotianil and furametpyr.

Herbicidal active ingredients include, for example, imazsulfuron and bromobutide.

The active ingredient for regulating plant growth includes, for example, uniconazole P.

The agrochemical active ingredient used in the present invention may be used as it is, or mixed with a solid carrier such as clay and, if necessary, may be used as a powder pulverized using a pulverizer such as a dry pulverizer. The particle size of the agrochemical active ingredient is generally 200 μm or less, preferably 100 μm or less. The particle size of the agrochemical active ingredient used in the present invention is a particle size measured by a laser diffraction/scattering type particle size distribution measuring device, and means a particle size that becomes 100% of the cumulative frequency in the volume-based frequency distribution. When the agrochemical active ingredient is mixed with a solid carrier, the particle size of the agrochemical active ingredient refers to the particle size of the mixture. A laser diffraction/scattering type particle size distribution measuring device includes, for example, LA-950V2 (manufactured by HORIBA), and a method of measuring by dispersing particles of an agrochemical active ingredient in water using the measuring device, so-called The particle size can be determined by a wet measurement method.

When the coating layer contains an agrochemical active ingredient, the total content of the agrochemical active ingredient is usually in the range of 0.01 to 10% by weight, preferably 0.05 to 5% by weight, based on 100% by weight of the present coated rice seed.

The coating layer may contain a colorant. As a colorant, a pigment, a pigment|dye, and dye are mentioned, for example, Among these, use of a pigment is preferable. As a pigment, use of a red or blue pigment is preferable, For example, Nubix G-58 (blue pigment, the nubiola company make) Todakara-300R (red pigment, the Toda Kogyo Co., Ltd. make) is mentioned.

When the coating layer contains a colorant, its total content is usually in the range of 0.01 to 10% by weight, preferably 0.1 to 5% by weight, more preferably 0.5 to 5% by weight based on 100% by weight of the present coated rice seed. .

Further, a surfactant may be adhered to the surface of the coating layer. The surfactant is preferably a nonionic surfactant, and the nonionic surfactant is preferably polyoxyethylene styrylphenyl ether. When the present coated rice seed is a coated rice seed in which a surfactant is attached to the surface of the coating layer of the present coated rice seed, the total content of the surfactant is usually 0.001 to 3% by weight based on 100% by weight of the main coated rice seed, preferably in the range of 0.01 to 2% by weight.

The coating layer may be formed by drying the rice seeds in a rolling state, adding calcium carbonate and the present copolymer latex to attach calcium carbonate to the surface of the rice seeds, and then drying.

The method for producing the present coated rice seed (hereinafter, referred to as “the present production method”) includes the steps of attaching calcium carbonate to the surface of the rice seed by adding calcium carbonate and the present copolymer latex while rolling the rice seeds (hereinafter, described as “Step 1”) and drying the seeds obtained in the above step (hereinafter referred to as “Step 2”).

In this manufacturing method, before implementing Step 1, it is generally immersed. Specifically, the dried rice seeds are put in a bag such as a rice seed bag and immersed in water. In order to obtain coated rice seeds with a high germination rate, it is preferable to immerse them in water with a water temperature of 15 to 20 ° C. for 3 to 4 days. After the rice seeds are taken out of the water, they are usually left standing or dried in a dehydrator to remove excess moisture from the surface.

Step 1 is performed using the rice seeds thus obtained. Step 1 is a step of (1-1) adding calcium carbonate (hereinafter, referred to as "step 1-1") and (1-2) adding the present copolymer latex in a rolling state of rice seeds (hereinafter, described as "step 1-2"). Step 1-1 may be followed by step 1-2, or the order of steps 1-1 and 1-2 may be reversed without any problem. Alternatively, steps 1-1 and 1-2 may be performed simultaneously.

As an apparatus for putting rice seeds in a rolling state, well-known apparatuses, such as a coating machine, can be used. The total amount of calcium carbonate added is generally 100 to 1200 parts by weight, preferably 150 to 1200 parts by weight, 150 to 1000 parts by weight, 150 to 500 parts by weight, and 190 to 400 parts by weight based on 100 parts by weight of dry rice seeds. range can be mentioned. In addition, the total amount of the copolymer latex added is usually 1 to 100 parts by weight based on 100 parts by weight of dry rice seeds, and preferred ranges include 5 to 50 parts by weight, 5 to 20 parts by weight, and 8 to 16 parts by weight. can And the weight ratio of the present copolymer and calcium carbonate is usually in the range of 1:10 to 1:100, preferably 1:25 to 1:50.

Step 1 will be described in more detail. In step 1-1, calcium carbonate is added to the rice seeds in a rolling state so that the calcium carbonate is sprinkled on the rice seeds. In step 1-2, the present copolymer latex is diluted with water as needed and added to the rice seeds in a rolling state so that the present copolymer latex is sprayed on the rice seeds. When the present copolymer latex is diluted with water, the latex is diluted so that the solid content of the latex is in the range of 20 to 65%, preferably 30 to 60%, more preferably 30 to 40%. The addition method of this copolymer latex is dripping and spraying is mentioned. In addition, in the present manufacturing method, a uniform coating layer can be formed on the surface of the rice seeds by repeating steps 1-1 and 1-2 while rolling the rice seeds. When step 1 is a step of attaching calcium carbonate to the surface of rice seeds by repeating steps 1-1 and 1-2 while rolling the rice seeds, the copolymer latex and calcium carbonate are added separately, respectively. In that case, the amount of calcium carbonate added at one time is usually 1 to 1/20, that is, equivalent to about 1/20, preferably about 1/2 to 1/6 of the dry rice seed weight, and 1 The amount of ash added is usually about 1/10 to 1/1000, preferably about 1/10 to 1/200, more preferably about 1/50 to 1/150 of the dry rice seed weight in terms of the weight of the copolymer. to be. That is, the one-time addition amount of calcium carbonate is generally 5 to 100 parts by weight, preferably about 16.7 to 50 parts by weight, based on 100 parts by weight of dry rice seeds, and the one-time addition amount of the present copolymer latex is based on the weight of the present copolymer. It is usually 0.1 to 10 parts by weight, preferably 0.5 to 10 parts by weight, more preferably 0.67 to 2 parts by weight, based on 100 parts by weight of dry rice seeds in conversion. The one-time addition amount of this copolymer latex used in the present invention means the total amount added to attach the calcium carbonate one-time addition amount to the rice seeds. Step 1-1 and Step 1-2 do not need to be alternately performed, and one of Step 1-1 and Step 1-2 may be performed according to the coating state. In a preferred embodiment of the present manufacturing method, it is preferable to repeat steps 1-1 and 1-2 in the range of 8 to 40 times. In this production method, only necessary water can be added. The total amount of water added (weight) is usually in the range of 1/2 to 1/100, preferably 1/3 to 1/30, of the total addition amount (weight) of calcium carbonate. However, the total amount of water added includes the amount of water used to dilute the present copolymer latex.

In step 1, when calcium carbonate adheres to the inner wall of the apparatus, approximately the entire amount of the added calcium carbonate may be adhered to the surface of the rice seeds by scraping off the calcium carbonate using a scraper. When agrochemical active ingredients and colorants are added, they are usually added together with calcium carbonate in step 1. In addition, after adhering a predetermined amount of calcium carbonate to the surface of the rice seed, the surfactant can be added to the rice seed in a rolling state, whereby the surfactant can be attached to the surface of the coating layer formed on the surface of the rice seed.

After performing step 1, perform step 2. Specifically, after performing step 1, the rice seed is taken out of the apparatus, put in a seedling box, spread thinly, left still and dried. The rice seeds are generally dried until the moisture content is below 20% (% by weight relative to the coated rice seeds). The moisture content of the coated rice seeds used in the present invention means a value measured after drying 10 g of a sample at 105° C. for 1 hour using an infrared moisture meter. As an infrared moisture meter, FD-610 manufactured by Ketsuto Science Lab can be used. In step 2, instead of the seedling box, you may use a mat or a plastic sheet to spread it thinly and dry it.

Since the coating layer of the coated rice seed prepared in this way has a high hardness in a wet state, it exerts an effect that it is difficult to receive deliquescence in fresh water direct sowing. The hardness of the wet state of the coating layer of this coated rice seed can be measured by the following method.

(I) The coated rice seeds in a dry state (water content of 20% or less) are cut in half using a cutter or the like. At this time, the rice seed b is cut along the direction of the arrow a as shown in FIG. 1 .

(II) Remove the brown rice part from the coated rice seed cut in half to obtain a test piece consisting of only a coating layer and rice husk.

(III) Put the test piece in a Petri dish filled with water in which the test piece is completely submerged, and after leaving the test piece in the completely immersed state for 30 minutes, take the test piece out of the water and wipe off the water on the surface of the test piece to wet it Obtain specimen c of

(IV) For the wet test piece c, the hardness is measured as follows using a simple granule hardness tester manufactured by Tsutsui Chemical Machinery Co., but a conical pressure bar is used in this measurement method.

(IV-I) As shown in FIG. 2 , the test piece c is placed on the sample stand d so that the cut surface is down, and the pressure bar e is lowered by turning the pressure handle and applied to the center of the test piece c.

(IV-II) Turn the handle slowly and record the hardness indicated by the pointer when the test piece c collapses and the pointer returns.

(IV-III) Measure in the same manner as above for 6 additional test pieces c, and the arithmetic average value calculated for 5 points excluding the maximum and minimum values among the measured values is defined as the hardness of the coating layer.

The hardness of the coating layer of the present coated rice seed as measured by the above method is usually 500 g or more, preferably 500 to 2500 g and 700 to 1500 g.

The rice cultivation method of the present invention (hereinafter referred to as "the present cultivation method") is carried out by sowing the present coated rice seeds directly into a paddy field. The rice paddy used in the present invention refers to one of a freshwater paddy field and a dripped paddy field. Specifically, sowing according to the method described in "Iron Coated Rice Freshwater Direct Sowing Manual 2010" (Yamauchi Minoru, Independent Administrative Organization, Agricultural Food Industry Technology Research Organization, Kinki China Shikoku Agricultural Research Center, March 2010, Non-Patent Document 1) carry out In that case, an iron-coated direct sowing machine such as Tetsumaki-chan (trade name) (manufactured by Kubota) can be used. After sowing, good cultivation is achieved by maintaining normal cultivation conditions.

In this cultivation method, pesticides and fertilizers can be applied before sowing, at the same time as sowing, or after sowing. Pesticides include fungicides, pesticides and herbicides.

Example

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

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

In the following Production Examples and Comparative Production Examples, rice seeds of the Hinohikari variety were used, and unless otherwise specified, production was carried out at room temperature (about 15°C).

In addition, the brand names used in Preparation Examples and Comparative Preparation Examples are as follows.

G-100: Calcium carbonate, manufactured by Sankyo Flour Co., Ltd.

SS#80: Calcium carbonate, manufactured by Nitto Chemical Industry Co., Ltd.

Narusta SR140: carboxy-modified SBR latex, Tg; -12 °C, solids content; 48.5%, made by Eiandoeru Co., Ltd., Japan

Narusta SR103: carboxy-modified SBR latex, Tg; 7°C, solids content; 48.2%, made by Eiandoeru Co., Ltd., Japan

Todakara 300R: red pigment, manufactured by Toda Kogyo Co., Ltd.

Nubix G-58: blue pigment, manufactured by nubiola

Shokosan Clay S : Pyrophyllite, made from Shoko Mining

Kurare Povaru PVA117S: polyvinyl alcohol, degree of saponification; 98.0 ~ 99.0 mol%, Kurarese Co., Ltd.

Mobiniru 180E: copolymer latex consisting of vinyl acetate and ethylene, Tg; -15 ° C, solids content; 55%, made by Japan Synthetic Chemical Industry Co., Ltd.

Mobiniru 6485: copolymer latex consisting of acrylic acid ester and styrene, Tg; -22 ° C, solids content; 55%, made by Japan Synthetic Chemical Industry Co., Ltd.

Preparation Example 1

First, a simple seed coating machine that can be coated when the amount of rice seeds used is small was manufactured. As shown in Fig. 3, a polyethylene cup 2 with a capacity of 500 mL is installed at the end of shaft 1, it is inserted into the drive shaft of stirrer 3 (three-one motor, manufactured by Shindong Science Co., Ltd.), and tilt the stirrer 3 so that the elevation angle is 45 degrees. A simple seed coating machine was manufactured by installing it on stand 4.

Next, 60.0 parts by weight of G-100 and 20.0 parts by weight of SS#80 were mixed to obtain a calcium carbonate mixture A. (D90-D10)/D50 of the calcium carbonate mixture A was 2.7.

Further, 6.6 g of Narusta SR140 and 3 g of water were mixed to obtain 9.6 g of a diluted Narusta SR140 water solution.

About 100 mL of water was put into a polyethylene cup with a capacity|capacity of 200 mL, 20 g of dry rice seeds were thrown in there, and it immersed for 10 minutes. Then, after taking out a rice seed from water and removing excess water|moisture content on the surface, it injected|thrown-in to the polyethylene cup 2 attached to the produced simple seed coating machine. The simple seed coating machine is operated at 3 rotations of the stirrer in the range of 130 to 140 rpm, and an amount of about 1/16 (about 0.6 g) of 9.6 g of Narusta SR140 water dilution is dropped onto the surface of the rice seeds using a dropper, while carbonic acid Calcium carbonate was attached to the rice seeds by adding about 1/16 of an amount (about 5 g) of 80 g of calcium mixture A. When the calcium carbonate mixture A adhered to the inner wall of the polyethylene cup 2, the calcium carbonate mixture A was scraped off using a spatula, and approximately the entire amount of the calcium carbonate mixture A added at one time was allowed to adhere to the rice seeds. While rotating the simple seed coating machine, add about 5 g of the calcium carbonate mixture A while dropping about 0.6 g of the Narusta SR140 water dilution solution onto the surface of the rice seeds using a dropper, repeating the operation 16 times in total to add 80 g of calcium carbonate mixture A was attached to the rice seed surface. The coated rice seeds were spread on a stainless steel tray so that they did not overlap and dried overnight to obtain a coated rice seed 1 of the present invention (hereinafter referred to as "mainly coated rice seed 1"). The content of calcium carbonate and the present copolymer with respect to 100% by weight of the main coated rice seed 1 was 77.5% by weight and 3.1% by weight, respectively, and the hardness of the coating layer of the main coated rice seed 1 was 908 g.

Preparation 2

30.0 parts by weight of G-100 and 9.0 parts by weight of SS#80 were mixed to obtain a calcium carbonate mixture B. (D90-D10)/D50 of the calcium carbonate mixture B was 3.2. 39 g of calcium carbonate mixture B and 1 g of Todakara 300R were mixed to obtain 40 g of mixture B.

Further, 3.3 g of Narusta SR140 and 1.5 g of water were mixed to obtain 4.8 g of a diluted Narusta SR140 water solution.

Coated rice seed 2 of the present invention was carried out in the same manner as in Preparation Example 1 except that 4.8 g of the Narusta SR140 water dilution solution was used instead of the Narusta SR140 water dilution solution 9.6 g, and 40 g of the mixture B was used instead of 80 g of the calcium carbonate mixture A. (hereinafter referred to as "this coated rice seed 2") was obtained. In addition, however, while rotating the simple seed coating machine, while dropping an amount (about 0.6 g) of about 1/8 of 4.8 g of Narusta SR140 water diluent on the surface of rice seeds using a dropper, 1/ of 40 g of calcium carbonate mixture B The operation of adding an amount of about 8 (about 5 g) was repeated a total of 8 times, so that 40 g of the mixture B was adhered to the surface of the rice seeds. The content of calcium carbonate and the present copolymer with respect to 100 wt% of the main coated rice seed 2 was 63.3 wt% and 2.6 wt%, respectively, and the hardness of the coating layer of the main coated rice seed 2 was 805 g.

Preparation 3

60.0 parts by weight of G-100 and 19.0 parts by weight of SS#80 were mixed to obtain a calcium carbonate mixture C. (D90-D10)/D50 of the calcium carbonate mixture C was 2.3. 79 g of calcium carbonate mixture C and 1 g of Nubix G-58 were mixed to obtain 80 g of mixture C.

A coated rice seed 3 of the present invention (hereinafter referred to as "mainly coated rice seed 3") was obtained in the same manner as in Production Example 1 except that the above mixture C was used instead of the calcium carbonate mixture A. The content of calcium carbonate and the present copolymer with respect to 100 wt% of the main coated rice seed 3 was 76.5 wt% and 3.1 wt%, respectively, and the hardness of the coating layer of the main coated rice seed 3 was 1020 g.

Preparation 4

70.0 parts by weight of (E)-1-(2-chloro-1,3-thiazol-5-yl-methyl)-3-methyl-2-nitroguanidine (ingredient name: clothianidin) and 30.0 parts by weight of shoco acid After mixing the clay S, it pulverized with a centrifugal grinder to obtain a powdery pesticide A. The particle size of the powdery pesticide A determined by wet measurement using LA-950V2 (manufactured by HORIBA) was 68.0 µm. 80 g of the calcium carbonate mixture C obtained in Preparation Example 3 and 0.086 g of the powdery pesticide A were mixed to obtain 80.086 g of a mixture D.

A coated rice seed 4 of the present invention (hereinafter referred to as “the main coated rice seed 4”) was obtained in the same manner as in Production Example 1 except that 80 g of the mixture D was used instead of 80 g of the calcium carbonate mixture A. The content of calcium carbonate and the present copolymer based on 100% by weight of the main coated rice seed 4 was 76.5% by weight and 3.1% by weight, respectively, and the hardness of the coating layer of the main coated rice seed 4 was 972 g.

Preparation 5

6.6 g of Narusta SR103 and 4.3 g of water were mixed to obtain 10.9 g of a diluted Narusta SR103 water solution.

Coated rice seed 5 of the present invention (hereinafter referred to as “main coated rice seed 5”) was prepared in the same manner as in Preparation Example 1 except that 10.9 g of the Narusta SR103 water dilution solution was used instead of the Narusta SR140 water dilution solution 9.6 g. got it The content of calcium carbonate and the present copolymer with respect to 100 wt% of the main coated rice seed 5 was 77.5 wt% and 3.1 wt%, respectively, and the hardness of the coating layer of the main coated rice seed 5 was 752 g.

Preparation 6

90.0 parts by weight of G-100 and 30.0 parts by weight of SS#80 were mixed to obtain a calcium carbonate mixture D. (D90-D10)/D50 of the calcium carbonate mixture D was 2.7.

Further, 9.9 g of Narusta SR140 and 3.7 g of water were mixed to obtain 13.6 g of a diluted Narusta SR140 water solution.

The present invention coated rice seed was carried out in the same manner as in Production Example 1 except that 120 g of the calcium carbonate mixture D was used instead of 80 g of the calcium carbonate mixture A, and 13.6 g of the Narusta SR140 water dilution solution was used instead of 9.6 g of the Narusta SR140 water dilution solution. 6 (hereinafter referred to as "the present coated rice seed 6") was obtained. In addition, however, while rotating the simple seed coating machine, while dropping an amount of about 1/24 (about 0.6 g) of 13.6 g of Narusta SR140 water dilution solution on the surface of rice seeds using a dropper, 1/ of 120 g of calcium carbonate mixture D The operation of adding an amount of about 24 (about 5 g) was repeated a total of 24 times, so that 120 g of the calcium carbonate mixture D was adhered to the surface of the rice seeds. The content of calcium carbonate and the present copolymer with respect to 100% by weight of this coated rice seed 6 was 82.9% by weight and 3.3% by weight, respectively, and the hardness of the coating layer of this coated rice seed 6 was 1392 g.

Preparation 7

120.0 parts by weight of G-100 and 40.0 parts by weight of SS#80 were mixed to obtain a calcium carbonate mixture E. (D90-D10)/D50 of the calcium carbonate mixture E was 2.7.

Further, 13.2 g of Narusta SR140 and 5.5 g of water were mixed to obtain 18.7 g of a diluted Narusta SR140 water solution.

The same operation as in Preparation Example 1 was followed except that 160 g of the calcium carbonate mixture E was used instead of 80 g of the calcium carbonate mixture A, and 18.7 g of the Narusta SR140 water dilution solution was used instead of 9.6 g of the Narusta SR140 water dilution solution. 7 (hereinafter referred to as "this coated rice seed 7") was obtained. In addition, however, while rotating the simple seed coating machine, while dropping an amount (about 0.6 g) of about 1/32 of 18.7 g of Narusta SR140 water diluent on the surface of rice seeds using a dropper, 1/ of 160 g of calcium carbonate mixture E The operation of adding an amount of about 32 (about 5 g) was repeated 32 times in total, so that 160 g of the calcium carbonate mixture E was adhered to the surface of the rice seeds. The content of calcium carbonate and the present copolymer with respect to 100% by weight of the main coated rice seed 7 was 85.8% by weight and 3.4% by weight, respectively, and the hardness of the coating layer of the main coated rice seed 7 was 2592 g.

Comparative Preparation Example 1

10.1 g of mixture E was obtained by mixing 10 g of iron oxide and 0.1 g of Kuraray Povaru PVA117S.

About 100 mL of water was put into a polyethylene cup with a capacity|capacity of 200 mL, 20 g of dry rice seeds were thrown in there, and it immersed for 10 minutes. Thereafter, the rice seeds were taken out of the water to remove excess moisture on the surface, and then put into a polyethylene cup 2 attached to the simple seed coating machine prepared in Production Example 1. Operate the simple seed coating machine at 3 rotations of the stirrer in the range of 130 to 140 rpm and spray water using a sprayer while adding about 1/4 of 10.1 g of Mixture E (about 2.5 g) to apply Mixture E to the rice seeds. attached. When the mixture E adhered to the inner wall of the polyethylene cup 2, it was scraped off using a spatula, and approximately the entire amount of the calcium carbonate mixture E added at one time was adhered to the rice seeds. The operation of adding about 2.5 g of Mixture E while rotating the simple seed coating machine while spraying water using a sprayer was repeated 4 times in total to attach 10.1 g of Mixture E to the surface of the rice seeds. A total of 1.1 g of water was used. Thereafter, the coated rice seeds were spread on a stainless steel tray so that they did not overlap and dried overnight to obtain a comparative coated rice seed 1 (hereinafter referred to as "comparative coated rice seed 1"). The contents of iron oxide and PVA with respect to 100 wt% of Comparative Coated Rice Seed 1 were 99.0 wt% and 1.0 wt%, respectively, and the hardness of the coating layer of Comparative Coated Rice Seed 1 was 70 g.

Comparative Preparation Example 2

5.8 g of Mobiniru 180E and 3.5 g of water were mixed to obtain 7.5 g of a water dilution of Mobiniru 180E.

The same operation as in Production Example 1 was followed except that 7.5 g of the Mobiniru 180E water dilution was used instead of 9.6 g of the Narusta SR140 water dilution solution to obtain a comparative coated rice seed 2 (hereinafter referred to as “comparative coated rice seed 2”) . The content of calcium carbonate and the present copolymer with respect to 100 wt% of Comparative Coated Rice Seed 2 was 77.5 wt% and 3.1 wt%, respectively, and the hardness of the coating layer of Comparative Coated Rice Seed 2 was 88 g.

Comparative Preparation Example 3

5.8 g of Mobiniru 6485 and 3.5 g of water were mixed to obtain 9.3 g of a water dilution of Mobiniru 6485.

The same operation as in Production Example 1 was performed except that 9.3 g of the Mobiniru 6485 water dilution was used instead of 9.6 g of the Narusta SR140 water dilution solution to obtain a comparative coated rice seed 3 (hereinafter referred to as “comparative coated rice seed 3”) . The content of calcium carbonate and the present copolymer with respect to 100 wt% of Comparative Coated Rice Seed 3 was 77.5 wt% and 3.1 wt%, respectively, and the hardness of the coating layer of Comparative Coated Rice Seed 3 was 288 g.

Next, a test example is shown.

Test Example 1

After putting soil into a seedling box (inner diameter 57.0*34.5*6.0cm) and fresh water, 100 coated rice seeds were sown. The said seedling box was left to stand in the packaging. After counting the coated rice seeds remaining 3 days after sowing, the residual ratio was calculated by the following formula.

Residual rate (%) = Number of coated rice seeds remaining after 3 days of sowing / 100 × 100

A result is shown in Table 1. The rice seed (control) refers to the uncoated rice seed, and the residual rate was less than 10% because the seed was devoured by birds such as sparrows.

[Table 1]

a arrow
b rice seed
c test piece
d sample stand
e pressure rod
1 shaft
2 cups made of polyethylene
3 stirrer
4 stand

Claims (8)

A coated rice seed having a coating layer on the surface of the rice seed, wherein the coating layer contains at least one copolymer selected from the group consisting of calcium carbonate and a styrene-butadiene copolymer and a methyl methacrylate-butadiene-styrene copolymer, The content of the calcium carbonate is 30 to 90% by weight of the coated rice seed with respect to 100% by weight of the coated rice seed. The coated rice seed according to claim 1 , wherein the copolymer has a glass transition point of 10° C. or less. A method for producing a coated rice seed comprising the steps below, and using 100 to 1200 parts by weight of calcium carbonate based on 100 parts by weight of the rice seed;
(1) while rolling the rice seeds, adding at least one copolymer latex selected from the group consisting of calcium carbonate and styrene-butadiene copolymer latex and methyl methacrylate-butadiene-styrene copolymer latex to rice seeds attaching calcium carbonate to the surface of the seed, and
(2) drying the seeds obtained in the above step. The coated rice seed according to claim 3, wherein the step (1) is a step of attaching calcium carbonate to the surface of the rice seed by repeating the step of adding calcium carbonate while rolling the rice seed and the step of adding the copolymer latex. manufacturing method. The method according to claim 4, wherein the amount of calcium carbonate added at one time is 1 to 1/20 of the weight of the rice seed, and the amount of the copolymer latex added at one time is 1/10 to 1/1000 of the weight of the rice seed in terms of the weight of the copolymer. A method for the preparation of coated rice seeds. Coated rice seed produced by the method according to any one of claims 3 to 5. A method of growing rice comprising the step of directly sowing the coated rice seed according to claim 1 or 2 or the coated rice seed prepared by the method according to any one of claims 3 to 5 in a paddy field. delete

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