WO2018123130A1

WO2018123130A1 - Method for manufacturing coated wet-field rice seed paddy that can be subjected to seed-soaking treatment

Info

Publication number: WO2018123130A1
Application number: PCT/JP2017/029936
Authority: WO
Inventors: 俊雄藤田; 室伏　克己
Original assignee: 昭和電工株式会社
Priority date: 2016-12-26
Filing date: 2017-08-22
Publication date: 2018-07-05
Also published as: JPWO2018123130A1

Abstract

The present invention pertains to a method for manufacturing coated wet-field rice seed paddy that can be activated by a seed-soaking treatment immediately before seeding, the method including a step for forming a coating layer of a composition containing an iron oxide powder (a) and a resin (b) on dried wet-field rice seed paddy that has not been subjected to a seed-soaking treatment. Specific modes include: a method for manufacturing coated wet-field rice seed paddy in which a composition containing the resin (b) is mixed with a mixture of a brown iron oxide powder (a) and dried wet-field rice seed paddy that has not been subjected to a seed-soaking treatment, and a coating layer containing the powder and the resin is formed on the seed paddy surface; and a method for manufacturing coated wet-field rice seed paddy in which dried wet-field rice seed paddy that has not been subjected to a seed-soaking treatment and a composition containing a brown iron oxide powder (a) and the resin (b) are mixed, and a coating layer containing the powder and the resin is formed on the seed paddy surface. Coated wet-field rice seed paddy manufactured according to this method: germinates immediately after seeding in a field; requires fewer countermeasures against weeds, which represent a burden on direct-seeding producers of wet-field rice; and grows in a more uniform manner, therefore reducing the amount of labor for cultivation management.

Description

Method for producing coated paddy rice seed bran capable of soaking treatment

The present invention relates to a method for producing paddy rice seed meal (hereinafter referred to as “coated rice seed meal”) to which powder suitable for direct sowing cultivation is attached. More specifically, since it is a coated paddy rice seed that can be activated by soaking immediately before sowing, germination immediately after sowing in the field reduces the weed measures that impose a burden on the direct seeder of the paddy rice and grows. The present invention relates to a method for producing a coated paddy rice seed meal in which the labor of cultivation management is reduced because of uniform.

Rice is one of the three largest crops in the world, and rice is an important crop with the largest cropping area in Japan. The current rice farming in Japan is generally rice planting, which is a method of transplanting seedlings grown in the seedling raising process to a field. Here, 30% of the rice production cost is considered as seedling raising cost, and its reduction is strongly desired. In addition, the aging of paddy rice producers is progressing, and labor-saving paddy rice cultivation technology is also required.
Thus, from the viewpoint of realizing cost reduction and labor saving of rice cultivation, a direct sowing method for directly sowing paddy rice seed pods in a flooded field has attracted attention.

In direct sowing cultivation method, recently, a method (Patent Document 1) was proposed in which a seed paddy rice seed was coated with a mixed powder of iron powder and calcined gypsum so that it would not float on the rice field water. A guidebook (Non-Patent Document 1) is issued under the common name of “Iron coating”, and many paddy rice producers try to introduce it. In addition, the spread activity by the website (Non-Patent Document 2) is also thriving.
Recently, iron (III) (Fe ₂ O ₃ ) and molybdenum trioxide (MoO ₃ ), which are one of the iron oxides that have avoided the problem of heat of oxidation that occurs during the production of coated rice seed pods, which is a weak point of iron coating technology, A coating technique using a mixed powder of three kinds of polyvinyl alcohol (Patent Document 2) and a coating technique using a mixed powder of triiron tetroxide (Fe ₃ O ₄ ) and slaked lime have been proposed (Patent Document 3).

Direct seeding cultivation of paddy rice using these coating techniques is performed after immersing the dry seed of paddy rice seeds to an integrated temperature of about 60 ° C. (for example, soaking seed straws in water at a temperature of 15 ° C. for 4 days) and activating (breaking down the dormancy). A coated paddy rice seed pod is produced by dressing with a bread type rolling granulator or the like, and the coated paddy rice seed pod is sown in a submerged field by a seeder or the like.
Paddy rice producers are working on direct sowing in parallel with transplantation cultivation, and the production of coated paddy rice seeds is generally carried out before the busy season of paddy rice transplanting cultivation, and the covered paddy rice seeds are about several weeks to two months before sowing. Will be stored in a dry atmosphere during the storage, but the seed pods covered with the coating during the storage progressed and the germs were activated by dip seeding, but the seed pods were again in a dormant state. It will fall into.

As a result, germination does not occur for several days after sowing in the field, and it takes about 10 days for the buds to come out, and weeds grow during that time, so the use of an initial herbicide is essential. When seeded on the surface of a field where the paddy rice seed pod has been washed down using the initial herbicide, the contact frequency between the rice root and the herbicide increases, and there is a risk of phytotoxicity such as poor germination, seedling failure or strong growth control. Has been pointed out to increase (Non-patent Document 3).

In addition, there is an individual difference in the degree of resting dormancy of the coated paddy rice seed pod, which affects the timing of germination of the coated paddy rice seed pod, and there is a difference in the growth between individuals in the one-stroke field. There is also a problem that water management becomes difficult.

Furthermore, if the seeded rice seeds produced by conventional coating technology are soaked in intimate contact with each other, the components are eluted from the coating layer, the coating layer collapses, and further, re-aggregation occurs due to re-adhesion between the coated rice seed rice seeds. As a result, there is a problem that the important functionality of the covered paddy rice seedling, which is an increase in weight, is lost, and the compatibility with the seeder is impaired. It was impossible to adopt an activated cultivation method.

Japanese Patent No. 44441645 JP 2013-146266 A JP 2016-189735 A

In view of the above-mentioned problems of conventional paddy rice seed coat coating technology, the problem of the present invention is that weeds become a burden on the direct rice seeding producers by germinating a coated paddy rice seed seed that can be soaked immediately before sowing in the field. The purpose of the present invention is to provide a method for producing a coated paddy rice seed bran in which the effort of cultivation management (water management) is reduced because the measures are reduced and the shoots grow uniformly and well.

As a result of intensive investigations, the inventors of the present application have found that a rice paddy rice bran that has not been subjected to soaking treatment is a resin composition containing iron oxide, preferably a powder of iron oxide mineral (limonite) produced naturally. The present invention was completed by finding that the above-mentioned problems can be solved by coating a rice paddy to produce a coated paddy rice seed meal.

That is, the present invention relates to the following matters.
[1] Activated by seeding treatment immediately before sowing, including a step of forming a coating layer of a composition containing iron oxide powder (a) and resin (b) on the dry seed of paddy rice seed that has not been soaked A method for producing coated paddy rice seeds that germinate early.
[2] A mixture of brown iron oxide powder (a) and paddy rice seedling that has not been soaked is mixed with a composition containing resin (b), and the surface of the seeds is mixed with powder. 2. The method for producing a coated paddy rice seed meal according to item 1, wherein a coating layer containing a resin is formed.
[3] A paddy rice seed cake that has not been subjected to soaking treatment is mixed with a composition containing brown iron oxide powder (a) and resin (b), so that the powder and resin are applied to the seed rice surface. The method for producing a coated paddy rice seed meal according to item 1 above, wherein a covering layer is formed.
[4] The method for producing a coated paddy rice seed meal according to any one of items 1 to 3, wherein the iron oxide is limonite.
[5] The method for producing a coated paddy rice seed meal according to any one of items 1 to 3, wherein the iron oxide contains goethite.
[6] The method for producing a coated rice seed meal according to any one of 1 to 5 above, wherein the iron oxide powder (a) is contained in an amount of 10 to 50 parts by mass with respect to 100 parts by mass of the coated rice seed meal.
[7] The method for producing a coated paddy rice seed meal according to any one of items 1 to 6, wherein the iron oxide powder (a) is contained in an amount of 70 to 99 parts by mass with respect to 100 parts by mass of the resin coating layer.
[8] The method for producing a coated paddy rice seed meal according to any one of items 1 to 7, wherein the iron oxide powder (a) has an average particle size in the range of 30 to 100 μm.
[9] The method for producing a coated paddy rice seed meal according to any one of items 1 to 8 above, wherein the coating layer contains a fertilizer component (c).
[10] The resin (b) is selected from the group consisting of a vinyl acetate polymer resin, an acrylate copolymer resin, an ethylene / vinyl acetate copolymer resin, and an ethylene / vinyl acetate / acrylic acid copolymer resin. 10. A method for producing a coated paddy rice seed pod according to any one of 1 to 9 above, comprising at least one resin.
[11] The method for producing a coated paddy rice seed meal according to any one of 1 to 9 above, wherein the resin (b) contains a biodegradable resin.
[12] The method for producing a coated paddy rice seed meal according to any one of 1 to 11 above, wherein the resin (b) is a resin emulsion.
[13] The resin emulsion is a vinyl acetate polymer aqueous emulsion, an acrylic ester copolymer aqueous emulsion, an ethylene / vinyl acetate copolymer aqueous emulsion, an ethylene / vinyl acetate / acrylic acid copolymer emulsion, or a biodegradable aqueous solution. 13. The method for producing a coated paddy rice seed meal according to item 12, which is one or more resin emulsions selected from the group consisting of resin emulsions.
[14] A seedling germination and raising seedling method capable of omitting the use of a herbicide during the germination period, characterized in that the coated paddy rice seed straw obtained by the method according to any one of items 1 to 13 is subjected to seeding immediately before sowing.

The coated paddy rice seed cake obtained by the production method of the present invention in which the dry seed of paddy rice seed cake not subjected to the soaking treatment is coated with a resin composition containing iron oxide powder has an integrated temperature (average water temperature × By sowing treatment for a period (days) in which the number of days) is 60 to 100 ° C., the seeds are activated to a germinable state much earlier than the germination of weeds after sowing in the field. Therefore, there is an advantage that the weed control which is a burden on the direct rice sowing producer is reduced without using the initial herbicide and the cultivation management (water management) labor is reduced because the shoots grow uniformly and uniformly.

2 is a photograph of limonite paste A produced in Preparation Example 1. 4 is a photograph of the coated paddy rice seed pod (2) produced in Example 2. FIG.

In the present invention, the surface of the paddy rice seedling that has not been soaked is coated with a coating layer containing iron oxide powder and resin.

[Iron oxide powder (a)]
In the present invention, examples of the iron oxide used in the coating layer include ferrous oxide (FeO), triiron tetroxide (Fe ₃ O ₄ ), α-iron oxyhydroxide (α-FeOOH), γ-oxy Examples of the minerals containing brown iron oxide include iron hydroxide (γ-FeOOH), for example, wustite, magnetite (ferrite), goethite (goethite), sprite (repidocrocite), limonite (limonite). Is mentioned. Limonite is a common name for iron oxide minerals and refers mainly to one or both aggregates of goethite and sphalerite. Brown iron oxide is preferred because it is close to the color of the field and is less susceptible to bird damage, and limonite is particularly preferred from the viewpoint of stability and production cost.

Limonite preferably used in the present invention has a goethite content of 10% by mass or more, more preferably 15% by mass or more, and further preferably 20% by mass or more. When the content ratio of goethite is 20% by mass or more, a brown color is exhibited. In addition, the inclusion of goethite can be analyzed, for example, by X-ray diffraction (XRD) under the conditions of an X-ray source CuKα, an output of 45 kV-40 mA, and a scanning range (2θ) of 10 to 90 deg.
Limonite may be used as it is natural products mined from the mine, but after aging, such as outdoor exposure after mining, use those that have been subjected to processing such as pulverization with spike mills, classification with sieves, etc. May be.

Limonite mines in operation in Japan are known as the Sugawara Mine (Shinanomachi, Kamimizunai-gun, Nagano Prefecture) and Daiichi Aso Mine (Aso City, Kumamoto Prefecture). Manufactures and sells limonite mined by open pit mining from ore deposits, after aging such as outdoor exposure for several years, followed by pulverization with a pulverizer such as a spike mill and processing with a sieve. In the present invention, it can be used as it is as a powder containing brown iron oxide.

In the present invention, Fe ₂ O ₃ (iron oxide (III)), α-Fe ₂ O ₃ (α-iron oxide (III)), β, as long as the brown color of the iron oxide powder (a) is not impaired. -Fe ₂ O ₃ (β-iron oxide (III)), γ-Fe ₂ O ₃ (γ-iron oxide (III)), ε-Fe ₂ O ₃ (ε-iron oxide (III)), β-FeOOH Iron oxides such as (β-iron oxyhydroxide), δ-FeOOH (δ-iron oxyhydroxide), Fe (OH) ₂ (iron (II) hydroxide), Fe (OH) ₃ iron hydroxide (III) And other powders may be used.

The brown color mentioned here is a color centered on L ^* : 38.21, a ^* : 40.54, b ^* : 51.83 represented by the L ^* a ^* b ^* color system, and L ^* and a ^*. B ^* is 30 to 200, L ^* and b ^* are fixed, a ^* is 30 to 50, and a ^* and b ^* are fixed, L ^* is a color in the range of 15 to 45. is there.

The particle size of the iron oxide powder (a) is preferably in the range of 30 to 100 μm, more preferably 30 to 80 μm, and even more preferably 30 to 75 μm. If the particle size is 30 μm or more, the bulk specific gravity is large, so that the volume of the coating layer required is small and the work efficiency is improved. When the thickness is 100 μm or less, the coating layer is hardly disintegrated in water and peeled off from the surface. The average particle diameter referred to here is a volume cumulative particle diameter D50 measured by a laser diffraction / scattering particle size distribution measuring apparatus.

In the present invention, the iron oxide powder (a) in the coated paddy rice seed bran is preferably contained in an amount of 10 to 50 parts by weight, more preferably 20 to 45 parts by weight, based on 100 parts by weight of the coated paddy rice seed bran. More preferably, it is 25 to 40 parts by mass. When the content ratio is 10 parts by mass or more, the apparent specific gravity increases and it becomes difficult to flow after sowing, and when it is 50 parts by mass or less, the coating layer is easily maintained.
The ratio of the iron oxide powder (a) in the resin coating layer is preferably 70 to 99 parts by mass, more preferably 80 to 99 parts by mass, and still more preferably 100 parts by mass of the resin coating layer. Is 90 to 99 parts by mass. If it is 70 parts by mass or more, it is possible to effectively prevent the soot from floating, and if it is 99 parts by mass or less, the strength of the coating layer can be maintained.

[Resin (b)]
Although the kind of resin used for the coating layer in the present invention is not particularly limited, for example, vinyl polymer, acrylic polymer, diene polymer, copolymer of vinyl monomer and acrylic monomer and / or diene monomer, urethane polymer, biodegradable polymer Etc. Specific examples include vinyl acetate polymer resins, acrylate copolymer resins, ethylene / vinyl acetate copolymer resins, and ethylene / vinyl acetate / acrylic acid copolymer resins. These can also be used as a mixture.

From the viewpoint of coating strength, the resin is preferably used as an emulsion. A water-based resin emulsion in which the dispersion medium is water is more preferable from the viewpoints of reducing deterioration of seed pods and burden on the environment.
Water-based resin emulsions include vinyl acetate polymer aqueous emulsion, acrylic ester copolymer aqueous emulsion, ethylene / vinyl acetate / acrylic acid copolymer aqueous emulsion, ethylene / vinyl acetate copolymer aqueous emulsion, and biodegradable Resin emulsions are preferred.

Among these, from the viewpoint of environmental burden, an ethylene / vinyl acetate copolymer aqueous emulsion and a biodegradable resin emulsion are more preferable.
As an aqueous resin emulsion product used in the present invention, for example, Polysol (registered trademark) series of Showa Denko KK (vinyl acetate polymer aqueous emulsion, acrylic ester copolymer aqueous emulsion, ethylene / vinyl acetate copolymer aqueous emulsion, And ethylene / vinyl acetate / acrylic acid copolymer aqueous emulsion).
Examples of the biodegradable resin include Randy PL series (polylactic acid resin emulsion) manufactured by Miyoshi Oil & Chemical Co., Ltd.

When the resin (b) is mixed with the iron oxide powder (a) to coat the seeds, the solid content concentration of the emulsion of the resin (b) is preferably 10 to 85% by mass from the viewpoint of easy handling. More preferred is 25 to 70 parts by mass, and still more preferred is 40 to 60 parts by mass. On the other hand, the solid content concentration of the emulsion when the resin (b) is sprayed onto the mixture of the iron oxide powder (a) and the paddy rice seed meal is preferably 1 to 10% by mass, more preferably 2 to 7 parts by mass. More preferably 3 to 6 parts by mass.

The ratio of the resin (b) in the resin coating layer is preferably 0.1 to 43 parts by mass, more preferably 0.5 to 25 parts by mass, and still more preferably 100 parts by mass of the powder (c). Is 1 to 10 parts by mass. If the amount is 0.1 parts by mass or more, the seed can be effectively coated with the seed, and if it is 43 parts by mass or less, the workability at the time of coating is good.

[Fertilizer component (c)]
In this invention, you may add a fertilizer component (c) to a coating layer as needed. Examples of the fertilizer component (c) include KH ₂ PO ₄ (potassium dihydrogen phosphate), K ₂ HPO ₄ (dipotassium hydrogen phosphate), K ₃ PO ₄ (tripotassium phosphate), K ₄ P ₂ O _7. (Tetrapotassium pyrophosphate), K ₅ P ₃ O ₁₀ (potassium tripolyphosphate), potassium phosphates such as (KPO ₃ ) n (potassium metaphosphate, n = 10,000), and MoO ₃ (molybdenum oxide ( VI)), adenosine, guanosine, thymidine, cytidine, uridine, xanthosine, inosine and their 2′-deoxy forms, adenylate (adenosine-5′-phosphate), guanylate (guanosine-5′-phosphate), Thymidyl acid (thymidine-5'-phosphate), uridylic acid (uridine-5'-phosphate), xanthylic acid (xanthosine-5'-phosphate), inosinic acid (inosine-5'-phosphate) And nucleosides such as these 2′-deoxy forms, nucleotides, uric acid, inosine and the like. Nucleosides and nucleotides may be free forms or salts such as sodium salts and potassium salts. Among them, food additives (KPO ₃ ) _n (potassium metaphosphate, n = 10,000), MoO ₃ (molybdenum oxide (VI)), inosine, and inosine acid (inosine-5′-phosphate) are preferable. These can be used alone or in plural.

The fertilizer component (c) is preferably 0.01 to 10 parts by weight, more preferably 0.05 to 7.5 parts by weight, and still more preferably 0.00 to 100 parts by weight of the iron oxide powder (a). 1 to 5 parts by mass. If it is 0.01 mass part or more, an effect will be acquired at the time of growth, and if it is 10 mass parts or less, it is favorable in terms of productivity or cost.

[Thickener (d)]
A general thickener (d) can be used in the coating layer as needed. By using a thickener, it is possible to coat the paddy rice seed meal in a uniform state without separating the paste.

Thickeners include cellulose compounds such as hydroxyethyl cellulose, hydroxypropyl cellulose, cellulose nanofibers, glycol compounds such as polyethylene glycol distearate, polyacrylic acid sodium salt, guar gum, xanthan gum, and mixtures thereof. It can be illustrated. Of these, hydroxypropylcellulose, guar gum, xanthan gum, a mixture thereof, and cellulose nanofiber, which are known as food additives, are preferable.

The thickening agent is preferably used in an amount of 0 to 5 parts by mass, more preferably 0 to 3 parts by mass, and still more preferably 0 to 1 part by mass with respect to 100 parts by mass of the iron oxide powder (a). If a thickener is 5 mass parts or less, it has favorable handleability.

[Dispersant (e)]
A general dispersant (e) can be used in combination with the coating layer as necessary. The wettability and dispersibility of the powder surface can be improved by mixing the dispersant with the iron oxide powder (a) and the resin (b) and then coating the paddy rice seed meal. As the dispersant, a known surfactant can be selected and used according to the surface state of the powder particles to be used. Specifically, polycarboxylic acids such as Demol (registered trademark) EP, Homogenol (registered trademark) L-18, Poise (registered trademark) 520, and 530 (above, manufactured by Kao Corporation) as an anionic surfactant. Type surfactant, naphthalene sulfonic acid formalin condensate type surfactant such as Demol (registered trademark) N (manufactured by Kao Corporation), and the like. Nonionic surfactants such as Surfynol (registered trademark) TG, acetylene glycol type surfactants such as 104E (manufactured by Nissin Chemical Industry Co., Ltd.), Emulgen (registered trademark) 102KG, 103, 104P, 105, 106, 108, 109P, 120, 123P, 130K, 147, 150 (above, manufactured by Kao Corporation), etc., Emulgen (registered trademark) 210P, 220 Polyoxyethylene cetyl ether such as (manufactured by Kao Corporation), polyoxyethylene stearyl ether such as Emulgen (registered trademark) 306P, 320P, 350 (above, manufactured by Kao Corporation), Emulgen (registered trademark) 404 408, 409V, 420, 430 (above, Kao Corporation Fatty acid esters such as polyoxyethylene oleyl ether such as Pegnol (registered trademark) O-6A (manufactured by Toho Chemical Co., Ltd.), Tyrabazole (registered trademark) L-01 (manufactured by Taiyo Chemical Co., Ltd.), Neugen (registered) Trademarks) Polyoxyethylene alkyl ether type surfactants such as ET (Daiichi Kogyo Seiyaku Co., Ltd.), polyoxyethylene alkyl phenyl ether types such as Nonal 210 and 212 (trade names, manufactured by Toho Chemical Co., Ltd.) Surfactant etc. are mentioned. These can be used alone or in combination.

The amount of the dispersant (e) used is, for example, when iron oxide powder (a) and resin (b) are mixed in advance to form a paste and then coated on paddy rice seed meal, iron oxide powder (a) 100 The amount is preferably 0.01 to 30 parts by mass, more preferably 0.1 to 15 parts by mass, and further preferably 1 to 10 parts by mass with respect to parts by mass. If a dispersing agent is 30 mass parts or less, the influence on the disintegration property of a coating layer is small.

[Foam suppressant (f)]
A general foam inhibitor (f) can be used in the coating layer as needed. The workability during coating can be improved by previously mixing the foam suppressant with the iron oxide powder (a) and the resin (b) and then coating the paddy rice seed meal.
Antifoaming agents include Nopco (registered trademark) 8034, Nopco (registered trademark) 8034-L, SN deformer 477, SN deformer 5013, SN deformer 247, SN deformer 382 (above trade name, manufactured by San Nopco Co., Ltd.), Anti Home 08 (trade name), Emargen (registered trademark) 903 (above, manufactured by Kao Corporation), Awabreak G-109, SO-101, L-01, LJ-01, H-01 (above, Taiyo Kagaku) Commercially available products such as those manufactured by KK) can be used.

The amount of the antifoaming agent used is preferably 0.01 to 3% by mass, more preferably 0.05 to 2 parts by mass, and still more preferably 0.001% by mass with respect to 100 parts by mass of the iron oxide powder (a). 1 to 1 part by mass. If the amount of the foam suppressor is 0.01 parts by mass or more, a good foam suppressing effect is obtained, and if it is 3 parts by mass or less, the influence on the disintegration of the coating layer is small.

The coated paddy rice seed cake obtained by the production method of the present invention has a water temperature of 10 to 20 ° C., preferably 3 days before, preferably 2 days to 1 day before sowing, specifically 2 days to 1 day before sowing. By immersing in water at 12 to 17 ° C., more preferably 13 to 16 ° C. for several days, it is possible to perform seeding treatment at an integrated temperature of 60 to 100 ° C., preferably 65 to 100 ° C., more preferably 70 to 100 ° C. Thus, after seeding in the field, germination occurs early and the period until germination is complete is shortened. Here, “early” means that the germination period, which is an evaluation item of the germination test, is within 4 days, preferably within 3 to 2 days from the sowing date, and “integrated temperature” is water temperature × immersion This is a value calculated in days.
Early germination (reduction of germination time) leads to suppression of weeds because it germinates and grows faster than weeds. Furthermore, the suppression of weeds leads to a reduction in the herbicide sprayed at seeding and after germination.

[Manufacturing method of coated paddy rice seed]
The method for producing a coated paddy rice seed meal according to the present invention includes a step of coating the surface of a dry rice seed meal that has not been subjected to soaking treatment with a composition containing iron oxide powder (a).
Examples of the method include the following methods 1 and 2.

Method 1: A mixture of iron oxide powder (a) and paddy rice seedling that has not been soaked is mixed with composition (i) containing resin (b), and iron oxide is applied to the surface of the seeds. After forming the coating layer containing the powder (a) and the resin (b), the dispersion medium of the composition (i) is dried.
Method 2: A paddy rice seed pod that has not been soaked and a composition (ii) containing both the iron oxide powder (a) and the resin (b) are mixed and oxidized on the surface of the seed pod. After forming the coating layer containing the iron powder (a) and the resin (b), the dispersion medium of the composition (ii) is dried.

In any method, the dispersion medium of the composition containing the resin (b) can contain an organic solvent miscible with water. It is preferable to use alcohols such as methanol, ethanol, normal propyl alcohol, and isopropyl alcohol in combination from the viewpoint of shortening the drying time of the coating of the final seed surface or sterilizing the composition. From the viewpoint, ethanol is more preferable.
The organic solvent miscible with water is preferably used in an amount of 50 parts by mass or less, more preferably 40 parts by mass or less, and still more preferably 30 parts by mass or less with respect to the entire dispersion medium. By setting the organic solvent to 50 parts by mass or less, it is possible to obtain a composition excellent in workability and hygiene with a low environmental load.

In the case of producing a coated paddy rice seed cake having a resin coating layer in Method 1, a composition containing the resin (b) in a mixture of iron oxide powder (a) and paddy rice seed paddy seed pad not subjected to soaking treatment It is only necessary that the product (i) can be sprayed and mixed and then dried, and the spraying, mixing method and drying method are not limited.
For example, a paddy rice seed cake that has not been soaked in a rolling granulator or the like and a powder (a) of iron oxide are loaded and rotated to produce a mixture, and a resin is added to the mixture. There is a method of spraying the composition (i) containing (b). As a spraying method, it can carry out manually using a spray etc., and machines, such as a mist spraying apparatus, can also be used.

The composition (i) used in Method 1 includes, in addition to the resin (b), fertilizer components, thickeners, dispersants, antifoaming agents and the like of the above-mentioned (c) to (g) as necessary. The additive may be contained. The viscosity of the composition (i) in Method 1 is preferably 1 to 5 mPa · s, more preferably 1 to 3, and still more preferably 1 to 1.5. If the viscosity of the composition is 1 to 5 mPa · s, it is suitable for spraying and mixing.

When preparing the paste-like composition (ii) using the iron oxide powder (a) used in Method 2 as a filler, the iron oxide powder (a), the resin (b) and other additives are added. The mixing method and the order of adding the materials are not limited as long as they can be uniformly dispersed.

For example, a paste is prepared by stirring and mixing all materials at once, or a mill base is prepared in advance by stirring and mixing materials other than the resin (b), and the resin (b) is added to the mill base and further added. A method of stirring and mixing can be used. There is no restriction | limiting in particular in the combination of the material at the time of producing a mill base, All the materials should just be contained in the final paste. In the present invention, a method of preparing a mill base in advance is preferable because the dispersibility of the resin (b) is improved and the production efficiency is improved.

When producing a coated paddy rice seed meal having a resin coating layer using the paste-like composition (ii), if the composition (ii) can be smeared on the dry rice seed paddy that has not been soaked and then dried Well, the smearing method and the drying method are not limited.
For example, after loading paddy rice seedling that has not been soaked into an apparatus such as a tumbling granulator, the composition (ii) is added while rotating to add paddy rice seedling that has not been soaked. After smearing the composition (ii), a resin coating layer having excellent mechanical properties is formed by air-drying in a room temperature atmosphere for several hours to a whole day and night on a container such as a stainless bat, a vinyl sheet, a bag, and newspaper. Can do.

In the case of Method 2, the viscosity of the composition (ii) is preferably 5,000 to 30,000 mPa · s, more preferably 6,000 to 28,000, and still more preferably 6,000 to 25, 000. A composition having a viscosity of 5,000 to 30,000 mPa · s is suitable for handling as a paste.

In addition, the drying in the method 1 aims at raising the hardness of the resin coating layer which evaporated the dispersion medium etc. of resin (b) contained in a composition, and was fixed to the seed candy.
The purpose of drying in Method 2 is to increase the hardness of the resin coating layer that adheres to the seed meal by evaporating the dispersion medium or the like contained in the composition (ii).
The hardness of the coating layer is preferably 50 to 200N. If it is 50 N or more, it is difficult to receive bird damage, and if it is 200 N or less, the germination rate is good. The hardness of the coating layer is a value measured for each seed soot on which the coating layer is formed, and a hardness meter HH-411 manufactured by Mitutoyo Corporation can be used as the measuring instrument.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited thereto.

[Measurement of average particle size]
Using a Microtrac MT3000II (Nikkiso Co., Ltd.) apparatus, the dispersion medium was measured as ion-exchanged water.
[Measurement of color]
Measurement was performed using a spectrocolorimeter CM-700d (manufactured by Konica Minolta Co., Ltd.), and the values were recorded as L ^* a ^* b ^* color system values.

Preparation Example 1: Preparation of Limonite Paste A In a 150 mL polyethylene container, 996.45 g of water, Tylabazole (registered trademark) W-01 (manufactured by Taiyo Kagaku Co., Ltd.) 24.06 g, Awabreak (registered trademark) L-01 ( From Taiyo Kagaku Co., Ltd.) 24.11 g, Potassium Metaphosphate (Tayo Chemical Industry Co., Ltd.) 24.06 g, Gum Ace (registered trademark) SGH-30 (Taiyo Kagaku Co., Ltd.) 12.01 g and ethanol 120.80 g 25.0 g of the prepared solution was weighed, and LMB50 (manufactured by Nippon Limonite Co., Ltd .; aged limonite mined from the mine for 3 years was pulverized with a spike mill and classified using a sieve. goethite, average particle size ^{50μm, L *: 38.2, a} *: 40.5, b *: 51.8) 70.0g was added, rotation An aqueous resin (ethylene / vinyl acetate copolymer resin) was prepared in a mill base prepared by stirring and mixing for 3 minutes at 1200 rpm under atmospheric pressure using a rotating stirrer (Shinky Corporation Awatori Nertaro ARV-310LED). ) Emulsion Lonefix eco # 700 (Showa Denko Co., Ltd., solid concentration: 50%) 8.00 g was added, and stirring and mixing was performed for 3 minutes under atmospheric pressure and 1200 rpm using the same rotating / revolution type stirring device. As a result, limonite paste A was obtained. The appearance (photograph) of the obtained paste A is shown in FIG.

Preparation Example 2 Preparation of Limonite Paste B In a stand mixer (model KSM5WH, manufactured by KitchenAid) equipped with a flat beater and a 4.8 L stainless steel bowl, 679.6 g of LMB50 (manufactured by Limonite Japan) and water 996 .34 g, Tylabazole (registered trademark) W-01 (manufactured by Taiyo Kagaku Co., Ltd.) 24.47 g, Awabreak (registered trademark) L-01 (manufactured by Taiyo Chemical Co., Ltd.) 24.10 g, Potassium metaphosphate (Tayo Chemical Industries Co., Ltd.) (Company) 24.23 g, Gum Ace (registered trademark) SGH-30 (Taiyo Chemical Co., Ltd.) 12.34 g, and 312.1 g of a solution prepared from ethanol (103.03 g) were charged, and 10 minutes at 50 rpm under atmospheric pressure. An aqueous resin (ethylene / vinyl acetate copolymer tree) is prepared on a mill base prepared by kneading. Fat) Emulsion Lonefix eco # 700 (Showa Denko Co., Ltd., solid concentration: 50%) 83.2 g was added and further kneaded for 10 minutes at 50 rpm under atmospheric pressure to give limonite paste B Obtained.

Preparation Example 3: Preparation of Limonite Paste C 1268.65 g of the same solution as used in Preparation Example 1, LMB50 (2787.35 g manufactured by Nihon Limonite Co., Ltd., Lawn Fix eco # 700 (manufactured by Showa Denko KK, solid content) Limonite paste C was obtained in the same manner as in Preparation Example 2 from 326.12 g.

Preparation Examples 4 to 7: Preparation of limonite paste D, E, F, and G Limonite paste D shown in Table 1 in the same manner as Preparation Example 2 except that different aqueous resin emulsion products were used. , E, F and G were obtained.

Preparation Example 8: Preparation of iron oxide pastes (α) and (β) Preparation Example 2 except that iron oxide (III) and iron trioxide (both reagents manufactured by Kanto Chemical Co., Ltd.) were used instead of LMB50. Iron oxide pastes (α) and (β) were obtained in the same manner.

Example 1:
A self-made rolling granulator equipped with a granulation pan with a diameter of 20 cm, 20 g of paddy rice seed meal (using the milky queen seed meal from Toyama Prefecture, which was purchased from Uken, Inc. in 2015) and LMB50 (Co., Ltd.) 10 g of Nippon Limonite) was loaded. Rotating the granulation pan, spraying a 10-fold diluted Lonfix eco # 700 (made by Showa Denko Co., Ltd., solid content concentration 50%), which is an aqueous resin emulsion, with ion-exchanged water where the seed meal and LMB50 are familiar I was dressed. The same operation was repeated, and 10 g of LMB50 was finally coated with 7.9 g (resin 0.395 g) of a 10-fold diluted emulsion, and then dried on a 20 cm × 20 cm stainless steel vat for a whole day and night. Obtained.

Example 2:
A self-made rolling granulator equipped with a granulation pan with a diameter of 20 cm was charged with 20 g of paddy rice seed meal (the milky queen seed meal produced in 2015 from Toyama Prefecture purchased from Uken Corporation). The granulation pan was rotated, and 1.5 g of limonite (limonite) paste A obtained in Preparation Example 1 was smeared from the container with a spatula and smeared, and the limonite (limonite) paste was coated on the seed cake. The same operation was repeated, and finally 15 g of limonite paste A was coated on the seed basket and then dried on a 20 cm × 20 cm stainless steel vat overnight to obtain a coated paddy rice seed basket (2). The external appearance (photograph) of the obtained coated paddy rice seed pod (2) is shown in FIG.

Example 3:
In 2015, 500g of Hinohikari dried bonito from Kumamoto Prefecture was loaded into a seed coating machine (model number KC-50, manufactured by Keibunsha Seisakusho Co., Ltd.) and 0.37kg of limonite paste B obtained in Preparation Example 2 was carried out. By smearing in the same manner as in Example 2, a coated paddy rice seed pod (3) was obtained. The date of manufacture was April 8, 2016.

Examples 4-8
Using the limonite pastes D, E, F, and G prepared in Preparation Examples 4 to 8 and the iron oxide pastes (α) and (β) prepared in Preparation Example 8 and coated in the same manner as in Example 2. Paddy rice seed meal (4), (5), (6), (7), (8), and (9) were obtained. The records of production results are summarized in Table 2.

Comparative Example 1:
A self-made rolling granulator equipped with a granulation pan with a diameter of 20 cm, 20 g of paddy rice seed meal (using the 2015 Toyama Prefecture milky queen seed meal purchased from Uken, Inc. as dry rice), and “Powder Beauty” (Registered trademark, manufactured by JFE Steel Co., Ltd., Kinsei Matech Co., Ltd., a material for iron coating, a mixture of iron powder and calcined gypsum in a mass ratio of 10: 1) 2 g was added. The granulation pan was rotated, and ion-exchanged water was sprayed on the familiar place and dressed. Repeat the same operation, finally add 11 g of “Beautiful Beauty”, add 0.5 g of finished calcined gypsum, and then dress it with spraying ion-exchanged water, all day and night on a 20 cm × 20 cm stainless steel vat. Dried.
Since the surface of the coated seeds after drying was white, water was sprayed so as to soak the whole coated seeds, and dried all day and night. The same operation was repeated for another 4 days until the surface became reddish brown to obtain a coated paddy rice seed pod (10).

Comparative Example 2:
300 g of paddy rice seed pod (variety: Milky Queen, produced in Toyama Prefecture, 2015) purchased from Uken Co., Ltd. was immersed in a constant temperature water bath adjusted to 15 ° C. and held for 5 days. After taking out from water, it was air-dried for 24 hours in a room kept at a room temperature of 25 ° C. The self-made rolling granulator equipped with a granulation pan having a diameter of 20 cm was loaded with 20 g of the paddy rice seed cake subjected to the soaking process obtained here, and then the granulation pan was rotated and the paste obtained in Preparation Example 1 was then rotated. A 1.5 g of A was scraped from the container with a spatula and smeared to coat the seeds with the seeds. The same operation was repeated, and finally 15 g of paste A was coated on the seeds, and then dried on a 20 cm × 20 cm stainless steel vat overnight. Assuming storage at a farmhouse, storage was carried out in a cool and dark place for 30 days to obtain a coated paddy rice seed pod (11).

Comparative Example 3:
In 2015, 500 g of Hinohikari dry rice from Kumamoto Prefecture was immersed in a constant temperature water bath adjusted to 15 ° C. and held for 5 days. After taking out from water and air-drying in a room kept at room temperature of 25 ° C. for 24 hours, 0.37 kg of limonite paste C was smeared in the same manner as in Example 3, and the coated paddy rice seed pod (12) was coated. Obtained. The date of manufacture was April 8, 2016.

[Immersion test of coated paddy rice seed pod]
The limonite powder-containing resin-coated paddy rice seed pods (1) and (2) manufactured in Examples 1 and 2 and the iron powder powder-containing resin-coated paddy rice seed pod (10) manufactured in Comparative Example 1 were each overlapped with 25 g. A test bag wrapped in a tea-bowl shape so as to make the coated paddy rice seed rice in close contact with Bencot (registered trademark) M-3II (manufactured by Asahi Kasei Corporation) was prepared. Each test bag was immersed in each 100 mL glass beaker filled with water, set in a constant temperature water bath adjusted to 15 ° C., and allowed to stand for 6 days (cumulative temperature was 15 ° C. × 6 days = 90 ° C.). The coated seeds were observed. As a result, in the limonite powder-containing resin-coated paddy rice seed pods (1) and (2) produced in Examples 1 and 2, the coating layer has no change in appearance, and the water in the beaker also changes in color, turbidity, etc. I was not able to admit. In addition, no re-aggregation was observed, and the compatibility with the seeder continued to be maintained at the time of manufacture.
In the iron powder-containing resin-coated paddy rice seed pod (10) produced in Comparative Example 1, the water in the beaker and Bencot (registered trademark) M-3II (manufactured by Asahi Kasei Co., Ltd.) are colored reddish brown by the eluted iron rust. A part of the film was peeled off and a decrease in functionality was confirmed. In addition, re-aggregated lumps were also observed, confirming that compatibility with the seeder was significantly lost.

[Sprouting test]
A stainless steel mesh having a mesh size of 1.5 mm was placed in a glass water tank at a position 8 mm below the water surface. Coated paddy rice seed pods (2) treated in the above-mentioned seeding test of the coated paddy rice seed pods on the mesh, coated paddy rice seed pods (8) and (9) subjected to the same dip seeding treatment, and Comparative Example 2 (11) Each of 32 grains was placed and cultivated for 10 days while maintaining the water surface height in a constant temperature room at 25 ° C., and a germination test was carried out. Table 3 shows the change in germination rate (%) calculated from the number counted by visually confirming the number of days elapsed in the germination test.

[Field test]
From May 11th to May 17th, 2016, the coated paddy rice seed pod (3) produced in Example 3 was immersed in water in a thermostatic water bath adjusted to 15 ° C. while being put in a net bag, and subjected to dip seeding treatment. did.
Soaked in fields (I) and (II) that were spilled after 10% by 10m in width per stroke without herbicides, which were partitioned by a fence prepared in Aso City, Kumamoto Prefecture, on May 17, 2016 The coated paddy rice seed pod (3) subjected to the treatment and the coated paddy rice seed pod (12) obtained in Comparative Example 3 were sprayed as uniformly as possible by hand, and after surface sowing, October 18, 2016 with reference to Non-Patent Document 1 Cultivation was carried out while continuing observations as needed. The germination time was evaluated by referring to “I-1 Rice Cultivation Standards Germination and Emergence” among the crop survey standards by Iwate Agricultural Research Center. The results are summarized in Table 5.

The coated paddy rice seed pods (1) and (2) (Examples 1 and 2) prepared using the seed pod coating agent of the present invention are coated paddy rice seed pods (11) manufactured using conventional iron coating materials (comparative example) In comparison with 1), the results showed that the functionality and sowing machine compatibility were not lost at all. This is considered to be because the water resistance of the coating layer according to the present invention is very excellent. In addition, when the coated paddy rice seed bran of the present invention is sown after soaking, the period until germination is greatly shortened, and the result is that the bud alignment is good. Even in the field, the effect of early germination after sowing is effective in terms of controlling weeds, and the results are reflected in the yield of the harvest. Therefore, it is suggested that the effects of facilitating cultivation management (water management) can be realized while reducing the weed countermeasures that are a burden on the direct rice sowing producer.
From the above results, the excellent effect of the seed soot coating agent of the present invention in which the iron oxide powder and the resin are combined is clear.

The coated paddy rice seed bran produced by coating the dry straw that has not been soaked by the method of the present invention with the iron oxide-containing resin composition can greatly shorten the period until germination and suppress weeds. At the same time, since the cultivation management becomes easy, it can be widely used in the agricultural field where crops are cultivated, particularly in rice cultivation.

Claims

Activated by seeding treatment immediately before sowing, including the step of forming a coating layer of a composition containing iron oxide powder (a) and resin (b) on the dry seed of paddy rice seed rice not subjected to seeding treatment. A method for producing a coated paddy rice seed germinating.
A mixture of brown iron oxide powder (a) and paddy rice seed pods not subjected to soaking treatment is mixed with a composition containing resin (b), and the seed potato surface contains the powder and resin. The method for producing a coated paddy rice seed meal according to claim 1, wherein a coating layer is formed.
A coating layer containing powder and resin on the surface of the seed pod by mixing the dry seed of paddy rice pod not subjected to the soaking process and a composition containing brown iron oxide powder (a) and resin (b) The method for producing a coated paddy rice seed meal according to claim 1.
The method for producing a coated paddy rice seed meal according to any one of claims 1 to 3, wherein the iron oxide is limonite.
The method for producing a coated paddy rice seed meal according to any one of claims 1 to 3, wherein the iron oxide contains goethite.
The method for producing a coated rice seed meal according to any one of claims 1 to 5, comprising 10 to 50 parts by mass of the iron oxide powder (a) with respect to 100 parts by mass of the coated rice seed meal.
The method for producing a coated rice seed seed according to any one of claims 1 to 6, comprising 70 to 99 parts by mass of the iron oxide powder (a) with respect to 100 parts by mass of the resin coating layer.
The method for producing a coated rice seed bran according to any one of claims 1 to 7, wherein the average particle diameter of the iron oxide powder (a) is in the range of 30 to 100 µm.
The method for producing a coated paddy rice seed meal according to any one of claims 1 to 8, wherein the coating layer contains a fertilizer component (c).
The resin (b) is one or more selected from the group consisting of a vinyl acetate polymer resin, an acrylate copolymer resin, an ethylene / vinyl acetate copolymer resin, and an ethylene / vinyl acetate / acrylic acid copolymer resin The method for producing a coated paddy rice seed meal according to any one of claims 1 to 9, which comprises the above resin.
The method for producing a coated paddy rice seed meal according to any one of claims 1 to 9, wherein the resin (b) contains a biodegradable resin.
The method for producing a coated paddy rice seed meal according to any one of claims 1 to 11, wherein the resin (b) is a resin emulsion.
The resin emulsion is an aqueous vinyl acetate polymer emulsion, an acrylic ester copolymer aqueous emulsion, an ethylene / vinyl acetate copolymer aqueous emulsion, an ethylene / vinyl acetate / acrylic acid copolymer emulsion, or a biodegradable aqueous resin emulsion. The method for producing a coated rice seed bran according to claim 12, wherein the emulsion is one or more resin emulsions selected from the group consisting of:
14. A seedling germination and raising seedling method capable of omitting the use of a herbicide at the germination stage, characterized by immersing the coated paddy rice seed obtained by the method according to any one of claims 1 to 13 immediately before sowing.