JP7302941B2 - Rice seed bird damage prevention agent and rice seed bird damage prevention method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rice seed bird damage prevention agent and a rice seed bird damage prevention method.

Direct seeding of paddy rice is a cultivation method in which rice seeds are sown directly in the paddy field. It does not require raising seedlings or transplanting work, so it has the advantage of saving labor in agricultural work. It also has the drawback of being susceptible to (bird damage). A reduction in the rate of seedling establishment due to bird damage leads to a decrease in yield, so measures to avoid bird damage have been desired. As a conventional bird damage avoidance method, for example, a method of preventing bird damage by water management has been proposed, but it is necessary to change the management method according to the type of bird (see, for example, Non-Patent Document 1). .

Nagao Sakai, 3 others, "Cultivational Bird Damage Prevention Measures in Flooded Rice Direct Seeding Cultivation", The Hokuriku Crop Science, Crop Science of Japan, March 31, 1999, Vol. 34, p. 59-61

An object of the present invention is to provide an agent for preventing bird damage to rice seeds and a method for preventing bird damage to rice seeds in direct seeding cultivation of paddy rice.

As a result of investigations aimed at solving such problems, the present inventors found that it is possible to prevent bird damage to rice seeds by adhering zinc oxide to rice seeds and sowing them directly in paddy fields. .
That is, the present invention is as follows.
[1] A rice seed bird injury inhibitor containing zinc oxide.
[2] The rice seed bird damage inhibitor according to [1], wherein the zinc oxide has an average particle size of 0.01 to 100 μm.
[3] The rice seed bird damage inhibitor according to [1] or [2], wherein the content of zinc oxide is 0.1 to 100% by weight.
[4] A method for preventing bird damage to rice seeds, comprising the step of adhering the agent for preventing bird damage to rice seeds according to any one of [1] to [3] to rice seeds.

According to the present invention, bird damage to rice seeds can be prevented.

FIG. 2 is an explanatory diagram for explaining a simple seed coating machine used for coating rice seeds in Examples.

The rice seed bird damage inhibitor of the present invention (hereinafter referred to as the present inhibitor) is characterized by containing zinc oxide.

In the present invention, the rice seeds refer to the seeds of varieties that are generally cultivated as rice. Examples of the cultivar include japonica and indica, but cultivars with high lodging resistance and germination are preferred.

In the present invention, zinc oxide refers to a compound represented by ZnO, and commercially available zinc oxide can be used. Examples of commercially available zinc oxide include zinc oxide 3N5 (manufactured by Kanto Kagaku Co., Ltd.) and zinc oxide 1 (manufactured by Nippon Kagaku Kogyo Co., Ltd.). In the present invention, it is preferable to use zinc oxide having a purity of 99% or more (% by weight relative to the zinc oxide). The purity of zinc oxide is determined by the test method specified in Japanese Industrial Standard (JIS) K1410. Also, powdery zinc oxide is usually used, and the average particle size of the zinc oxide is in the range of 0.01 to 100 μm, preferably 0.1 to 50 μm, more preferably 0.1 to 10 μm. In the present invention, the average particle size of zinc oxide is a particle size measured by a laser diffraction/scattering type particle size distribution analyzer, and refers to a particle size with a cumulative frequency of 50% in the volume-based frequency distribution. The average particle size of zinc oxide can be determined by a so-called wet measurement method in which zinc oxide particles are dispersed in water and measured using Mastersizer 2000 (manufactured by Malvern) as a laser diffraction/scattering particle size distribution measuring device. can.

The inhibitor may consist solely of zinc oxide or may contain other ingredients such as binders, surfactants and carriers. Examples of such binders include synthetic resins such as acrylic resins, vinyl acetate resins, urethane resins and butadiene copolymers, water-soluble synthetic polymers such as polyvinyl alcohol and polyvinylpyrrolidone, and polymers derived from natural products such as alpha starch. is mentioned.
The content of zinc oxide in the inhibitor is generally 0.1 to 100% by weight, preferably 1 to 100% by weight. When the inhibitor consists only of zinc oxide, the content of zinc oxide in the inhibitor is 100% by weight.

This inhibitor is applied to rice seeds in order to prevent bird damage to rice seeds. The rice seed bird damage prevention method of the present invention (hereinafter referred to as the present prevention method) comprises a step of adhering the present inhibitor to rice seeds. This step can be carried out according to a known coating method such as iron coating. Specifically, the present inhibitor can be adhered to the rice seeds by adding the present inhibitor, optionally a binder and water while rolling the rice seeds. When the inhibitor consists only of zinc oxide, a binder is used to attach the zinc oxide to the rice seeds. As an apparatus for rolling rice seeds, an apparatus used in a known coating method such as a coating machine can be used.
The amount of the present inhibitor added in the present prevention method is usually 0.005 to 7 kg, preferably 0.05 to 7 kg, and more preferably 0.05 to 1.5 kg per 10 kg of rice seeds, in terms of weight of zinc oxide. .

After implementing the said process, the process of sowing the rice seed obtained by the said process directly in a paddy field is implemented. In the present invention, a paddy field refers to either a flooded paddy field or a submerged paddy field. Specifically, the process is "Iron Coating Flooded Direct Sowing Manual 2010" (Minoru Yamauchi, National Agriculture and Food Research Organization, Kinki Chugoku-Shikoku Agricultural Research Center, March 2010, Non-Patent Document 1) It is carried out according to the method described in . At that time, a direct seeding machine for iron coating such as Tetsumaki-chan (manufactured by Kubota Corporation) may be used. After sowing, the rice can be grown under normal cultivation conditions.
In addition, pesticides and fertilizers may be applied before seeding, simultaneously with seeding, or after seeding. Such agricultural chemicals include fungicides, insecticides and herbicides.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to prevent bird damage in direct seeding cultivation of paddy rice. Examples of birds that feed on rice seeds in direct seeding of paddy rice include sparrows, ducks, crows and pigeons.

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

First, a manufacturing example is shown.

In the following production examples, Hinohikari seeds were used as rice seeds unless otherwise specified, and the production was carried out at room temperature (about 20°C). Moreover, % represents % by weight.
The trade names described in the manufacturing examples are as follows.
Zinc oxide 3N5: Zinc oxide, manufactured by Kanto Chemical Co., Ltd., average particle size: 7.7 μm
One kind of zinc oxide: Zinc oxide, manufactured by Nippon Kagaku Kogyo Co., Ltd., average particle size: 0.26 μm
Two types of zinc oxide: Zinc oxide, manufactured by Nippon Kagaku Kogyo Co., Ltd., average particle size: 0.24 μm
Calcium carbonate G-100: Calcium carbonate, Superflex 500M manufactured by Sankyo Seifun Co., Ltd.: Urethane resin, synthetic resin content; 45%, Mowinyl-Powder LDM7000P manufactured by Daiichi Kogyo Seiyaku Co., Ltd.: Acrylic resin, synthetic resin content; 85% , Nippon Synthetic Chemical Industry Co., Ltd. Kuraray Poval PVA220S: Polyvinyl alcohol, Saponification degree: 87.0 to 89.0 mol%, Polymerization degree 2000, Kuraray bentonite Hotaka: Montmorillonite, Hojun Co., Ltd. Amicol W: Alpha starch, Solpol 5080 manufactured by Nippon Starch Chemical Co., Ltd.: Polyoxyethylene tristyryl phenyl ether, manufactured by Toho Chemical Industry Co., Ltd.

Production example 1
First, we constructed a simple seed coating machine that can be used to coat a small amount of rice seeds. As shown in FIG. 1, a polyethylene cup 2 with a capacity of 500 mL is attached to the tip of a shaft 1, and it is inserted into the drive shaft of a stirrer 3 (three-one motor, manufactured by Shinto Kagaku Co., Ltd.) so that the elevation angle becomes 45 degrees. A simple seed coating machine was produced by attaching the agitator 3 to the stand 4 with the agitator 3 inclined as shown.
0.22 g of Superflex 500M and 0.19 g of water were mixed to obtain 0.41 g of a water dilution of Superflex 500M.
About 100 mL of water was placed in a 200 mL capacity polyethylene cup, and 20 g of dry rice seeds were put therein and soaked for 10 minutes. After that, the rice seeds were taken out of the water, excess moisture on the surface was removed, and the seeds were put into a polyethylene cup 2 attached to the simple seed coating machine. The simple seed coating machine is operated at a rotation speed of the agitator 3 of 130 to 140 rpm to bring the rice seeds into a tumbling state, and 0.41 g of the superflex 500M water-diluted solution and 1.0 g of zinc oxide are added to the rice seeds. attached zinc oxide to rice seeds. The simple seed coating machine was then left running to keep the rice seeds rolling, and 0.1 g of Sorpol 5080 was added to adhere to the surface of the coated zinc oxide. The rice seeds taken out from the simple seed coating machine were spread on a stainless steel vat so as not to overlap and dried overnight to obtain zinc oxide-coated rice seeds (1).

Production example 2
The present inhibitor (1) was obtained by mixing 0.5 g of two types of zinc oxide, 9.5 g of calcium carbonate G-100 and 0.4 g of Mowinyl-Powder LDM7000P.
The following operations were carried out according to the method described in Production Example 1. After 20 g of dry rice seeds were soaked, they were placed in a tumbling state using a simple seed coating machine, and 10.4 g of this inhibitor (1) was added while spraying water onto the rice seeds with a sprayer to adhere to the rice seeds. . The total amount of water sprayed on rice seeds was 1.6 g. The simple seed coating machine was then left running to keep the rice seeds rolling, and 0.4 g of Sorpol 5080 was added to adhere to the surface of the coated zinc oxide. The rice seeds taken out from the simple seed coating machine were spread on a stainless steel vat so as not to overlap and dried overnight to obtain zinc oxide-coated rice seeds (2).

Production example 3
An inhibitor (2) was obtained by mixing 5.0 g of zinc oxide 3N5, 5.0 g of calcium carbonate G-100, 0.1 g of Kuraray Poval PVA220S and 0.25 g of bentonite.
The following operations were carried out according to the method described in Production Example 2. Instead of 10.4 g of the present inhibitor (1), 10.35 g of the present inhibitor (2) was added and adhered to rice seeds. The total amount of water sprayed on rice seeds was 2.8 g. Next, 0.1 g of Sorpol 5080 was applied to the surface of the coated zinc oxide and dried to obtain zinc oxide-coated rice seeds (3).

Production example 4
This inhibitor (3) was obtained by mixing 2.5 g of zinc oxide type 2, 7.5 g of calcium carbonate G-100 and 0.4 g of Amicol W.
The following operations were carried out according to the method described in Production Example 2. In place of the present inhibitor (1), the present inhibitor (3) was added and adhered to rice seeds. The total amount of water sprayed on rice seeds was 2.0 g. Then, by drying, a zinc oxide-coated rice seed (4) was obtained.

Next, test examples are shown.

Test example 1
About 30 g of soil was placed in a plastic petri dish and moistened with water, and then 50 zinc oxide-coated rice seeds were sown on the surface of the soil. The plastic petri dish was left to stand outdoors and photographed with a time-lapse camera to observe the state of the plastic petri dish.
Survival rate (%) = Number of rice seeds remaining 1 day after sowing/50 x 100
Table 1 shows the results. In Table 1, rice seeds (control) refer to rice seeds that were not coated with anything, and since the seeds were eaten by birds such as sparrows, the survival rate was 0%.

1 shaft 2 polyethylene cup 3 stirrer 4 stand

Claims (3)

A rice seed bird damage inhibitor containing zinc oxide, wherein the zinc oxide has an average particle size of 0.24 to 10 μm, and is applied to the rice seed surface in an amount of 0.5 to 2.5 kg as zinc oxide per 10 kg of rice seeds. A rice seed bird damage inhibitor coated on a rice seed. The rice seed bird damage inhibitor according to claim 1, wherein the content of zinc oxide is 0.1 to 100% by weight. 3. A method for preventing bird damage to rice seeds, comprising the step of adhering the agent for preventing bird damage to rice seeds according to claim 1 or 2 to rice seeds.

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