Pyrazosulfuron-ethyl and pendimethalin compounded wettable powder and preparation method thereof

Abstract

Relating to the technical field of transplanting rice field weed control, the invention provides a pyrazosulfuron-ethyl and pendimethalin compounded wettable powder and a preparation method thereof. The compounded wettable powder is prepared from 3 parts of pyrazosulfuron-ethyl, 30 parts of pendimethalin, 15 parts of fatty alcohol polyoxyethylene ether, 15 parts of phenylethyl phenol polyoxyethylene polyoxypropylene ether, and 37 parts of light calcium carbonate. The preparation method includes: mixing the raw materials, subjecting the mixture to coarse crushing and air jet pulverization in order, then fully mixing the materials, conducting sampling analysis, and when the sample is qualified, carrying out metering, packaging and warehousing. According to the invention, the pyrazosulfuron-ethyl and pendimethalin compounded wettable powder can achieve an obvious synergistic action range when pyrazosulfuron-ethyl and pendimethalin are compounded in a ratio of 1:10 to a concentration of 33%, while preparations formed by mixing in other ratios cannot achieve the obvious synergistic action range.

Description

technical field [0001] The invention relates to the technical field of prevention and control of weeds in transplanted rice fields, in particular to a pyrazosulfuron-methyl and pendimethalin compound wettable powder and a preparation method thereof. Background technique [0002] Weeds in transplanted paddy fields mainly include broad-leaved weeds, sedge weeds, and barnyard grass. At present, the existing herbicidal composition for the control of weeds in transplanted paddy fields, for example, the Chinese patent "CN103688967A" discloses a "herbicidal composition containing pyrazosulfuron-methyl and proclofen", using a weight ratio of 10:1~1:20 pyrazosulfuron-methyl and clofenac for compounding. Another Chinese patent "CN103392723A" discloses a "herbicidal composition containing pyrazosulfuron-methyl and pyriflubac-methyl", which uses pyrazosulfuron-methyl and pyrizafluor-methyl at a weight ratio of 15:1 to 1:10 for compounding . [0003] The inventor has verified through ...

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Problems solved by technology

For example, the prepared wettable powder is not easy to disperse and suspend in water, or block the nozzle, and cause precipitation in the sprayer, resulting in uneven spraying

[0006] 3), compounding problem, by carrying out toxicity test, thermal storage stability test and co-toxicity coefficient measurement to the above-mentioned several specific proportions disclosed by several herbicidal compositions, it is found that no obvious synergistic effect can be achieved

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