上海市农科院生态环境所科研人员采用田间试验方法研究了33%二甲戊灵乳油、96%精异丙甲草胺乳油、50%敌草胺水分散粒剂和90%禾草丹乳油等4种芽前除草剂防除直播小白菜田杂草效果及其安全性,筛选出了适于直播小白菜田的芽前除草剂。结果表明,药后35天,33%二甲戊灵乳油有效用量371.25~742.5g/hm2、96%精异丙甲草胺乳 Shanghai Academy of Agricultural Sciences Institute of Eco-environmental researchers using field experiments to study the 33% pendimethalin EC, 96% s-metolachlor EC, 50% propranolol water dispersible granules and 90% And other 4 kinds of pre-emergence herbicide to control weeds in live-broadcast cabbage field and its safety, we screened the pre-emergence herbicide suitable for direct-sowing cabbage field. The results showed that after 35 days, the effective dosage of 33% pendimethalin 371.25-742.5g / hm2, 96%