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为了确定330 g/L二甲戊灵EC能安全有效控制韭菜田杂草的用量，采用播后苗期施药，研究其在施后15、30、45 d对韭菜田旱稗、马唐等杂草的防治效果。试验结果表明，药后45 d，试验药剂495~742.5 g/hm2(有效成分用量)对旱稗、马唐、狗尾草、野苋、藜的最终株防效和鲜质量防效分别为96.97%~99.95%、97.86%~99.95%，96.46%~100%、96.78%~100%，92.51%~98.91%、94.06%~98.88%，54.51%~70.30%、58.69%~77.29%，55.82%~68.72%、72.64%~82.78%。药后10~30 d观察结果表明，试验药剂处理土壤对韭菜安全。“,”To determine the safe and effective amount of 330 g/L pendimethalin emulsifiable concentrate (EC) for weed control in leek field, we sprayed different amounts of the herbicide at seedling period, and studied its efficacy on , and so on, 15, 30 and 45 days after the herbicide applied in leek field. The results showed that, after being treated 45 days, the final plant control efficiencies and fresh weight control efficiencies were 96.97%-99.95% and 97.86%-99.95% on , 96.46%-100% and 96.78%-100% on , 92.51%-98.91% and 94.06%-98.88% on , 54.51%-70.30% and 58.69%-77.29% on , and 55.82%-68.72% and 72.64%-82.78% on respectively, while the application amounts of the herbicide was 495-742.5 g/hm2 (active ingredient). And the observation test was carried out 10-30 days after the herbicide applied, and the results showed that, 330 g/L pendimethalin EC was safe for leek as soil treatment.