对20%嗪.烟.莠油悬剂最佳用量、杂草田间防除效果及其玉米安全性进行了研究。结果表明:20%嗪.烟.莠油悬剂的适宜用量为450ga.i./hm2～600ga.i./hm2,且该用量下30天内对禾本科杂草防效为89.2%～96.5%,对阔叶杂草防效为92.9%～94.0%。该药剂对杂草的防除效果较38%莠去津1140ga.i./hm2、4%烟嘧磺隆60 ga.i./hm2和5%嗪草酸甲酯11.25ga.i./hm2单独施用时显著提高,对玉米无明显药害症状且增产显著。 The optimal dosage of 20% oxazine, tobacco and herbicide, the control effect of weeds and its maize safety were studied. The results showed that the suitable dosage of 20% oxazine and tobacco herbicides was 450ga.i./hm2~600ga.i./hm2, and the control effect on grass weeds was 89.2% ~ 96.5% , The control of broad-leaved weeds was 92.9% ~ 94.0%. The herbicide weed control effect of 38% compared to atrazine Atrazine 1140ga.i./hm2, 4% nicosulfuron 60 ga.i./hm2 and 5% methylphenazine oxalate 11.25ga.i./hm2 alone administered When significantly increased, no obvious symptoms of maize and significant yield increase.