CN-116723763-B - Seed coating method

Abstract

Provided is a seed coating method which can obtain high-quality coated seeds which are singulated in a short time and in a simplified process in an iron-based seed coating technique. The method for coating seeds according to the present invention is a method for coating the surfaces of seeds with a seed coating agent containing an iron-based powder, and comprises a step of adhering the seed coating agent to the surfaces of the seeds, and a step of oxidizing the iron-based powder by supplying water and air while flowing the seeds on which the seed coating agent is adhered, thereby forming a coating layer on the surfaces of the seeds.

Inventors

• SASHI KAZUMICHI
• YU BOFAN

Assignees

• 杰富意钢铁株式会社

Dates

Publication Date

20260512

Application Date

20220214

Priority Date

20210316

Claims (5)

1. 1. A seed coating method for coating the surface of a seed with a seed coating agent containing an iron-based powder, comprising: a step of adhering the seed coating agent to the surface of the seed, and And a step of oxidizing the iron-based powder by supplying water and air while flowing the seed to which the seed coating agent is adhered, thereby forming a coating layer on the surface of the seed, wherein the air is supplied so that the atmospheric temperature becomes 46 ℃ or higher.
2. 2. The method for coating seeds according to claim 1, wherein air is supplied in the step of adhering the seed coating agent to the surface of the seeds.
3. 3. In a seed coating method in which a seed surface is coated with a seed coating agent containing an iron-based powder, The seed coating agent is adhered to the surface of the seed by supplying the seed coating agent, water and air while flowing the seed, and the iron-based powder is oxidized to form a coating layer on the surface of the seed, wherein the air is supplied so that the atmospheric temperature becomes 46 ℃ or higher.
4. 4. The method for coating seeds according to any one of claims 1 to 3, wherein the seed coating agent contains 1 or more carboxylic acids having 2 or more carboxyl groups in 1 molecule, and/or 1 or more carboxylic acids having 2 or more carboxyl groups in 1 molecule are added at the time of seed coating.
5. 5. The method of coating seeds according to claim 4, wherein the amount of the carboxylic acid is 0.01 to 6 mass% based on the mass of the metallic iron of the iron-based powder.

Description

Seed coating method Technical Field The present invention relates to a seed coating method of coating seeds with a seed coating agent containing iron powder. Background With the aging of agricultural workers and globalization of agricultural product distribution, labor saving of agricultural works and reduction of agricultural product production cost have become problems to be solved. In order to solve these problems, for example, in rice cultivation, a direct seeding method of directly seeding seeds in a field is becoming popular for the purpose of saving labor for seedling raising and transplanting. Among them, a method using seeds coated with iron powder in order to increase the specific gravity of the seeds is attracting attention because of the advantages of preventing floating and outflow of seeds in water fields and preventing bird damage. As a method of coating iron powder on seeds, for example, patent document 1 discloses a method of spreading coated rice seeds thinly, blowing humidified air, continuing the oxidation reaction of the iron powder at room temperature of 25 ℃ for 12 hours, and then drying at 40 ℃. Patent document 2 discloses a method for producing iron powder coated rice seeds by using silica gel for rice seeds having an iron powder coating layer formed thereon to inhibit aggregation of the coated seeds. In patent document 2, the oxidation reaction of iron powder is performed by ventilating the seeds with humidified air having a relative humidity of 80% or more and a temperature of 10 to 30 ℃. Patent document 3 discloses a method of coating seeds by dispersing a dispersion liquid having a ph of 3.0 or more and 6.5 or less and oxidizing an iron-based powder at an atmospheric temperature of 31 ℃ or more and 45 ℃ or less. In patent document 3, in order to prevent heat generation, the oxidation reaction is promoted by applying the seeds to a pad or the like in a thin manner, and the oxidation treatment can be completed in about 2 hours. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2005-192458 Patent document 2 Japanese patent application laid-open No. 2014-221009 Patent document 3 Japanese patent application laid-open No. 2019-213465 Disclosure of Invention Problems to be solved by the invention In patent document 1, the oxidation time is about 12 to 24 hours, and there is a problem that the disintegration rate increases when the oxidation is not proper. In patent document 2, although the amount of water dispersed for oxidizing the iron powder is set to be appropriate, a long time of about 8 hours is required for oxidizing the iron powder, and there is a problem that oxidation does not proceed sufficiently in a short time, and the coating peels off. In patent document 3, in order to prevent the death of seeds, it is necessary to strictly control the pH and the atmospheric temperature of the dispersion liquid, and rust occurs in a short time of about 2 hours, but aggregation and bonding of seeds are easily caused by rapid oxidation reaction, and seeding becomes difficult. Although the time is shortened, there is a problem in terms of singulation at the cost. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a seed coating method capable of obtaining high-quality coated seeds that are singulated in a short time and in a simplified process in an iron-based seed coating technique. Means for solving the problems The inventors of the present application have conducted intensive studies to solve the above problems, and as a result, have found the following findings. As a result of examining various coatings (coating) of coated seeds and promotion of oxidation reaction, it was found that when water and air were supplied to the fluidized seeds during and/or after coating, oxidation reaction proceeded and single-grain seeds could be obtained. In addition, when air at a temperature equal to or higher than a specific temperature is supplied, the oxidation reaction proceeds further, and the seeds are not damaged, so that the well-granulated coated seeds can be obtained in a short time. The present invention has been completed based on the above findings, and has the following constitution. (1) The seed coating method according to the first aspect of the present invention is a method for coating the surface of a seed with a seed coating agent containing an iron-based powder, and the seed coating method includes a step of adhering the seed coating agent to the surface of the seed, and a step of oxidizing the iron-based powder by supplying water and air while flowing the seed to which the seed coating agent is adhered, thereby forming a coating layer on the surface of the seed. (2) In the case of (1), air is supplied in the step of adhering the seed coating agent to the surface of the seed. (3) In the seed coating method according to the second aspect of the present invention