玉米育种田传统除草剂产品的应用受天气、土质、地表情况、使用技术及用量等因素影响较大,药效经常表现不稳定。而且长时间使用,田间出现了一些抗性杂草,同时也导致用药量增加。一些极易产生漂移的药剂,使用不当会对周围对除草剂敏感的作物及蔬菜等经济作物产生药害。随着化学防除技术在农业生产中的广泛推广,苗后化学除草已广泛应用于玉米生长的各个时期,用药简单,操作灵活,而且对玉米育种田安全。1苗后除草剂的选择1.1选择性除草剂使用较为普遍的有磺酰脲类除草剂和三酮类除草 The application of traditional herbicide products in corn breeding fields is greatly influenced by factors such as weather, soil quality, surface conditions, using technology and dosage, etc., and the efficacy often shows instability. And for prolonged use, some resistant weeds appeared in the field, which also led to an increase in dosage. Some highly mobile pesticides can cause phytotoxic effects on cash crops such as crops and vegetables that are sensitive to the surrounding crops if used improperly. With chemical control technology widely promoted in agricultural production, post-emergence chemical weeding has been widely used in various stages of corn growth, medication is simple, flexible operation, and corn breeding safety. A selection of post-emergence herbicides 1.1 Selective herbicides The more common use of sulfonylurea herbicides and triketone herbicides