田间试验结果表明，用１５０ ，２００ ｇ／ 亩４０ ％ 乙莠水悬浮剂播后苗前土壤处理防除大蒜田杂草，药后１４ 天的总株防效为９１ ．１ ％ 和９５ ．１ ％ ；药后４５ 天的总鲜重防效为８９ ．２ ％ 和９０ ．１ ％ ，明显优于对照药剂。同时可显著提高大蒜产量，增产率达１５ ．６ ％ ～１７ ．８ ％ 。且对大蒜安全，对后茬棉花无任何不良影响。 The results of field trials showed that the control of weeds in the garlic field with the soil before and after sowing with 150, 200 g / mu 40% B herbicides was 91%. 1% and 95. 1%; 45 days after drug control of total fresh weight of 89. 2% and 90. 1%, significantly better than the control agent. At the same time can significantly increase the yield of garlic, increase production rate of 15. 6% ~ 17. 8%. And the garlic safety, no adverse effects on the stubble cotton.