According to relevant department statistics, there are thousands of different types of herbicides in China. At present, farmers' friends have gradually accepted and used chemical herbicides. The vast majority of users report that the use of herbicides is small, effective, labor-saving, and cost-effective. However, many problems also arise when using herbicides. Some farmers said that the use of herbicides still kills weeds; others reflect that although they can kill grass, the rate of killing the grass is not high; others also say that killing grass also harms crops; others complain and kill. The grass of the current season crop has harmed the seedlings of the next season crop. In the face of problems arising from the use of herbicides, we should analyze the causes and take appropriate measures to better exert the weeding effect. Correct choice of herbicides. The application of herbicides has a great relationship with the variety of pesticides used. For example, in Datian, more monocotyledonous weeds are used to kill dicotyledonous herbicides to kill immortal monocotyledonous weeds. On the contrary, if there are more dicotyledonous weeds in Daejeon, herbicides mainly used to kill monocotyledonous weeds also kill immortal dicotyledonous weeds. Herbicides include amide herbicides, sulfonylurea herbicides, nitrobenzene herbicides, organophosphorus herbicides, phenoxy acid herbicides, and the like. Some herbicides should be treated before sowing, and some should be applied after sowing before emergence, and some should be treated after emergence. If the herbicides treated in different periods are applied upside down, the effect of killing the grass is not obvious, and some even have negative effects. Make full use of ecological conditions. Although herbicides have been selected for production and application, if we do not pay attention to ecological conditions, herbicides are arbitrarily applied, and the effects are often unsatisfactory. If the herbicides such as trifluralin and diterpineamine, which are very sensitive to the light conditions, are used for soil treatment before sowing, they must be coated with enamel and soil at the time of application. Otherwise, they can easily be volatilized by photolysis and affect the herbicide function. Some herbicides also have strict temperature requirements, and they produce phytotoxicity at high and low temperatures, and they have the best effect of killing grass at a suitable temperature range. Dryland herbicides require stringent humidity and soil moisture, and the lack of lyrical effect is poor. When applied after a rainy day, the efficiency of killing grass will be greatly increased. Improve the level of application technology. One is to grasp the herbicide application in different situations. It is like using glyphosate and reeds of drought-resistent crops, when 200-300 grams per mu is used to control Dodder in the soybean field, only 4 grams per acre is needed. The second is to use drugs for different stages of the crop. As with the use of 2,4-D, it is easy to produce phytotoxicity before rice tillers, and it can effectively control broad-leaved weeds and sedges when rice is used during the tillering period. Third, weeds have different herbicides for different fertility processes. The fourth method is to use surface application, spot application or directed application according to different crops and different weeds. The fifth is to flexibly apply herbicides based on the benefits of temperature, light and moisture.
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