豆田除草剂分为播前、播后苗前、苗后3种类型。前2种类型，使用起来省工，省药，也比较安全，但是受土壤水分状况、土壤质地等影响较大。条件不适宜时，药效较差。播前除草剂必须与土壤混合后效果才能较好，虽然农村农机具增加了不少，但耕翻后播大豆的仍很少，这就给施药带来? Herbicide can be divided into three types: pre-sowing, post-sowing and post-emergence. The first two types, the use of labor-saving, provincial medicine, but also more secure, but affected by soil moisture, soil texture and other larger. When the conditions are not suitable, the efficacy is poor. Before sowing herbicide must be mixed with the soil effect is better, although a large increase in rural agricultural machinery, but sowing after sowing the soybean is still very small, which gives the drug to bring?