1989年我场应用国产除草剂50%乙草胺防除大豆田杂草3万亩,取得良好效果。乙草胺是选择性芽前除草剂,主要防除稗草、狗尾草等一年生禾本科杂草,对鬼针、蓼等部分阔叶草也有一定防效。我场在5月中下旬大豆播后苗前全面或苗带喷雾,为 In 1989, we applied 50% acetochlor, a homemade herbicide, to control 30,000 mu of weed in soybean field and achieved good results. Acetochlor is a selective pre-emergence herbicide, the main control of barnyard grass, Setaria and other annual grass weeds, on the needle, Polygonum and some broadleaf also have some control effect. My field in late May after sowing soybean seedlings before spraying or full, with