Small wheat field
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To control grass weeds in wheat fields, common herbicides such as isoproturon, oxazol and grass can not be used during cold air activity. Isoproturon will reduce the cold resistance of wheat seedlings, and it is easy for the wheat seedlings to suffer from "frozen phytotoxicity". It is required that frost weather will not occur 1 week after application. In the low-temperature frost period, oxazolyl is applied, and the wheat seedlings are also susceptible to phytotoxicity, and the herbicidal effect is affected. Acetyl oxalate has a wide spectrum of herbicides, wide application period, good mixedness, high safety to wheat, and temperature change does not affect safety. It can be applied from October to April, from wheat 2 leaf stage to jointing Can be applied at any time. In winter, weeding can generally achieve better results with 20% to 30 grams of 15% acetylene oxalate wettable powder per acre.
For the control of broad-leaf weeds, the herbicidal rate is slow in the low temperature period, and the mixing of 2, 4 and 4 chlorine can increase the speed of killing grass, but it is generally not recommended to apply the two when the temperature is too low (less than 5 ° C). medicine. Difluoro-oxazolidine is stable at low temperature, even if the temperature is 2 ° C, it has stable efficacy; the drug is suitable for wide application, and can be applied from late November to late January.