Chemical herbicide rational use technology
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1. Herbicides are selected based on crops and field weeds. Herbicides are generally selective, and different herbicides have large differences in their effects on different crops and weeds. For example, the selection of the thiasulfuron herbicide in the wheat field is very safe for wheat, and has a good inhibitory effect on broad-leaved weeds such as sage, sage, and sage, but on the grasses such as bluegrass and wild oats. The control effect of grass is not ideal, but the use of thrips and weeds in wheat fields has good control effect on grass weeds, but the control effect on broadleaf weeds is not good.
2. The herbicide is selected according to the growth period of the crop. According to different growth stages of crops, the use of herbicides can be divided into various treatment methods such as soil treatment before sowing, soil treatment before sowing, and treatment of post-emergence stems and leaves.
3. According to the herbicide action characteristics. Some herbicides have a long shelf life. When selecting a herbicide, it is necessary to consider whether the longer duration of the herbicide is harmful to the crop. For example, the long-lasting period of metsulfuron-methyl can be as long as 18 months. It cannot be used in the wheat fields in the north. After use, the corn grown in the second year is still phytotoxic.