JPH0142241B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a rice product containing 3-hydroxy-5methylisoxazole or its salt, methionine and/or abscisic acid, and 2,4-dichlorophenoxyacetic acid or its salt, ester, or acid amide as active ingredients. Concerning a ripening accelerator. Due to abnormal weather, rice crops in Japan are often affected by cold damage, mainly in Hokkaido and the Tohoku region, and this is not only caused by so-called impaired sterility due to low temperatures during the heading stage, but also impaired sterility during the flowering stage. Furthermore, poor ripening caused by low temperatures during the ripening stage is always made more serious, and a solution to this problem is desperately needed. Recently, studies have begun to examine the effects of chemical substances on preventing cold damage, and it has been found that 3-hydroxy-5-methylisoxazole improves ripening of paddy rice at low temperatures (Kokuyo and Horiku, 56, 657-660, 1981). , and β to 3-hydroxy-5-methylisoxazole
- The combined use of indole-3-butyric acid (IBA) and methionine has been shown to enhance the effect of improving ripening in paddy rice at low temperatures (Collection of Abstracts of the 169th Conference of the Crop Science Society of Japan, 161-162, 1980). Already known. The present inventors have discovered that 3-hydroxy-5-methylisoxazole or its salt (A) and methionine (B)
When 2,4-dichlorophenoxyacetic acid or its salt, ester or acid amide (D) was blended with or/and abscisic acid (C), unexpectedly, the combination of the above three or four compounds was We have found that this method has a very significant effect on rice grain filling at low temperatures by promoting the translocation of hydrocarbons to the panicle. In other words, by applying this combination agent during the earing and flowering stage of rice, it promotes the ripening of weak rice plants that are particularly susceptible to low temperatures, and improves the growth of stunted rice (kudzu rice).
They discovered that rice can be transformed into healthy rice, and completed the present invention. In particular, the reduction of damage caused by delayed cold damage and increased yield through treatment with this combination agent is extremely significant for Japan's agricultural industry, where the reduction of rice acreage is progressing. Salts of 3-hydroxy-5-methylisoxazole include sodium, potassium, calcium,
Examples include salts such as magnesium and ammonium, and potassium salts are particularly preferred. The metal atom etc. in these salts is substituted with the hydrogen atom of the hydroxyl group at the 3-position. Examples of the salt, ester or acid amide of 2,4-dichlorophenoxyacetic acid include sodium salt, potassium salt, amine salt, ammonium salt:
Examples include, but are not limited to, alkyl esters such as methyl ester, ethyl ester, butyl ester, or isobutyl ester, allyl esters, acid amides, and the like. The blending ratio of the active ingredients in the rice ripening accelerator of the present invention is 2,4-dichlorophenoxyacetic acid salt,
For 1 part by weight of ester or acid amide (D),
2.000 to 200 parts by weight of 3-hydroxy-5-methylisoxazole or its salt (A) and 3000 to 100 parts by weight of methionine (B) or abscisic acid
(C) 10 to 0.1 parts by weight is suitable. The rice ripening accelerator of the present invention comprises (A), (B) or/
(C) and (D) are mixed with a carrier in the above proportions to formulate powders, wettable powders, emulsions, etc., which are the usual formulation forms of agricultural chemicals. Various surfactants, polymer compounds, etc. are used as appropriate for the purpose of improving the properties of the preparation or increasing its biological effects. Of course other valuable growth regulators,
Herbicides, fungicides, insecticides, fertilizers, etc. can also be used in combination. As a treatment method for the chemical, it is used by spraying the target plants on the foliage or by irrigating the target plants, with the former being more preferred. Next, the effect of the rice ripening accelerator of the present invention will be explained with reference to test examples. Test Example 1 A 1/5000 Ahl Wagner pot was filled with well-crushed sandy soil, and germinated rice seeds (variety: Nipponbare) were sown on June 10th at 20 grains per pot.
Cut off the divisions as appropriate, grow them outdoors with only the main stem, and select the individuals that started heading and bloomed on September 5th.
Rice ears were immersed in a mixed solution of a predetermined concentration prepared according to Formulation Example 1 described later. The next day, I had pottu at 20pm.
They were transferred to an artificial climate box at 13°C at night and grown. The ears were sampled on September 22nd, and after drying with ventilation at 30°C for 48 hours, the fifth primary branch stem from the top was dissected, and the dry weight of the paddy derived from the second weakest branch stem from the tip was measured. . Data are shown for 14 panicles in each plot.

[Table] Formulation example 1 Wettable powder 3-hydroxy-5-methylisoxazole calcium salt ...10 parts by weight Methionine ...20 parts by weight 2,4-dichlorophenoxyacetic acid sodium salt
...0.02 parts by weight polyvinyl alcohol ...1 parts by weight Sodium dodecylbenzenesulfonate
...3 parts by weight of clay ...The remainder is mixed and ground to obtain a wettable powder. Formulation Example 2 Liquid 3-hydroxy-5-methylisoxazole potassium salt...3 parts by weight Methionine...3 parts by weight 2,4-dichlorophenoxyacetic acid sodium salt
...0.005 parts by weight of water ...Mix the remainder to obtain a liquid agent.

Claims (1)

[Claims] 1 Ripening of rice containing 3-hydroxy-5methylisoxazole or its salt, methionine and/or abscisic acid, and 2,4-dichlorophenoxyacetic acid or its salt, ester or acid amide as active ingredients Accelerator.