First, we must choose to use the herbicide in the most sensitive period of weeds in order to improve the weeding effect.
Second, we must choose to apply pesticides to rice in the strongest resistance to herbicides in order to ensure the safety of seedlings. In general, weeds are most sensitive to herbicides during the seed germination stage and seedling stage, where herbicides are most likely to exert their effect. Rice plants are most sensitive to herbicides during the bud stage and the 4-leaf stage and are prone to phytotoxicity. The application of herbicides at these stages of growth should pay attention to the concentration of the agents.
Third, the herbicide application time, must be combined with the transplanting time of rice, such as prometryn to prevent the tooth grass in paddy fields, must be 15 to 20 days after the rice transplant, when the tooth grass leaves from red to green, the most effective application good. If it is to prevent common conventional weeds, it must be the best effect after 10-15 days of rice transplanting. Transplanting rice fields are mainly treated with soil closure after transplanting, usually 3 to 7 days after transplanting, mixing with soil or mixing back with green manure to control weeds, annual broad-leaved weeds and Cyperaceae weeds. . If dibenzyl chloride is used, it can be sprayed for 2 to 3 weeks after transplanting.
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