采用田间小区试验方法,进行了质量分数为40%异丙草·莠悬乳剂播后苗前土壤封闭处理防除玉米田杂草药效试验。结果表明,质量分数为40%异丙草·莠悬乳剂对单、双子叶杂草均有较高防效,45d株防效为80.31%～89.09%,鲜重防效为80.89%～89.21%,随使用剂量增加,药效逐渐提高,而且对玉米出苗和生长发育无不良影响,增产幅度为11.88%～14.39%。 Field experiment was conducted to test the effect of controlling the weeds in corn field by blocking the pre-emergence soil with 40% The results showed that 40% of the weight of syneresis and antimicrobial herbicides had high control effect on both single and dicotyledonous weeds. The control effect of 45d strain was 80.31% ~ 89.09% and the fresh weight control effect was 80.89% ~ 89.21% , With the dose increased, the efficacy gradually increased, but no adverse effects on the emergence and growth of corn, increase rate of 11.88% ~ 14.39%.