Herbicide technique: strict control and spraying of crops during the sensitive period. Crops at different growth stages of pesticides, fungicides are not the same degree of sensitivity, sensitivity to herbicides more different. Under normal circumstances, crop germination, filling the first three leaves and flowering stage is particularly sensitive to herbicides wholesale hundred ridge through which several periods prone to injury. Improve herbicide effect: herbicide temperature to 20 ~ 35 ℃ is appropriate, air humidity on herbicide use also significantly affected the effectiveness hundred Ridge pass, leaf herbicide application under air humidity is relatively large, extended The residence time of herbicide weed foliage hundred ridge through wholesalers, to help weed leaf stomata open to absorb a large number of herbicides, the purpose to improve the herbicidal effect.