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利用3种不同的施药方式对玉米田杂草进行防除试验和对玉米安全性进行评价,结果表明:玉米苗后两次用药对杂草的防除效果最好,苗后一次用药次之,播后苗前施药对杂草的防效最差,施药后35d3种施药方式对杂草鲜重的防效分别为99.1％、89.2％～ 89.7％和63.5％.3种施药方式均对玉米安全,无药害.苗后两次用药对玉米的株高、鲜重及产量均无影响,产量与人工除草相当,适合推广应用.“,”The influence of three herbicide applications in corn field to control efficiency (CE) and safety were evaluated in field.The results showed that the best CE was 2 times applications of post-emergency herbicides,the better CE was one time application of post-emergency herbicides and the worst was the applications of pre-emergency herbicides.The CE of fresh weight herbs were 99.1％,89.2％-89.7％ and 63.5％ respectively.All of 3 applications methods were safety to corn,and there was not any adverse effects to corn height,fresh weight and yields in 2 times applications of post-emergency herbicides.The yields were same with manual weeding and it was suitable to be widespread.