Proper use of herbicides to avoid phytotoxicity: 1. Choose according to crop and weed species Herbicides are generally selective, and different herbicide varieties have different effects on crops and weeds. Farmers must carefully read the product label or instructions when choosing a herbicide, or purchase it under the guidance of agricultural technicians. The herbicide chosen should be safe for the crop used and efficient for crop weeds. For example, 2,4-D butyl ester and dimethyltetrachloride are safe for gramineous crops such as wheat and corn, and can kill dicotyledonous weeds such as ash, leek, etc., but generally for grasses, maiden and other grasses. Weeds are invalid. 2. Selection of crops and weeds according to different growth stages The period of herbicide use can be divided into pre-sowing soil treatment, pre-emergence soil treatment and post-emergence stem and leaf treatment. Appropriate herbicides should be selected according to the application period. 3. Take into account the choice of crops before and after Long-lasting herbicides such as chlorsulfuron, metsulfuron-methyl, acesulfame-methyl, chlorsulfuron-methyl (beansulfuron-methyl), chlorhexidine, chlorhexidine, and atrazine have longer residual effects in the soil. The sputum sensitive crops can cause phytotoxicity. When using this type of herbicide, it is necessary to take into account the raking crop. For example, in the soybean field using chlorsulfuron, it is not suitable to grow sensitive crops such as sugar beet, rapeseed, rice, potato, melon and vegetables, and the squat can grow wheat, soybean and corn. The wheat field herbicide containing chlorsulfuron and metsulfuron is limited to the use of water and drought crops in the south of the Yangtze River and cannot be used in wheat fields in the dryland areas of northern China.
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