Herbicides prevent: those long residual effect of herbicide degradation in soil, fenoxaprop, restructuring planting in Xinxiang fenoxaprop, be careful when switching to crops, Zhejiang fenoxaprop, First find out what the crop species, what is the use of herbicides, Vinca long, what should replant crops, after the crop safety. Try not to use long residual effect of herbicides. Herbicide injury prevention: Miao Ruomiao quite spraying; paddy shallow depth of less than 3 cm or flooded heart leaves no spraying; spraying Land is not too dry; not spraying when there is heavy rain or dew on the leaves; paddy leakage field is not spraying. Master agent is volatile, photolysis, is prone to physical or chemical reactions in the soil.