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To control grass weeds in wheat fields, common herbicides such as isoproturon, zodiazepam and so on 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 temperatures, and has stable efficacy even at a temperature of 2 ° C; the drug is suitable for a wide period of time, and can be administered from late November to late January.
Precautions for weeding in wheat field at low temperature
Recently, cold air activities are frequent, and the cold wave weather has a wide range of influences. Pay attention to the weather forecast before using the medicine, and grab the medicine in the "cold tail warm head". After most medicines, ensure that the temperature reaches 5~10 °C for more than 3 days, otherwise the control effect is not good and it is easy to cause phytotoxicity. Maiji 15% acetylene WP wettable powder, Maixi 58 g / liter of difluoro-oxazolidine suspension is less affected by the weather, safe in the low temperature period, and the effect is better, can be used to control the wheat field Gramineous weeds and broadleaf weeds.
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