(接上期)二、根据各地草向,因地制宜的研发适合的产品。由于玉米田苗前酰胺类除草剂和苗后磺酰脲类、三酮类及均三氮苯类除草剂多年大量单一使用,杂草的抗药性日益突出。目前玉米田苗后茎叶处理多以烟嘧磺隆、硝磺草酮及其与莠去津等其他药剂的复配剂居多,药剂品种相对单一。烟嘧磺隆对一年生禾本科杂草除草活性高于阔叶杂草活性,对田旋花、刺儿菜、马齿苋、苣荬菜等防效差。据资料记载,全球已发现69种杂草生物型对三氮苯类除草剂产生抗性,黑 (Continued) Second, according to the grass to the local conditions, the development of suitable products. Due to the corn field pre-emergence amide herbicide and post-emergence sulfonylurea, triketones and triazine herbicides for many years a single large number of single use, weeds increasingly prominent drug resistance. At present, the treatment of post-emergence leaves and stems of corn field is mostly nicosulfuron, mesotrione and its combination with atrazine and other agents, and the drug varieties are relatively single. Nicosulfuron had stronger weed control activity on annual weeds than broadleaf weeds, and had poor control effects on the fields such as Cyclotella, Caryota, Portulaca oleracea, According to the records, 69 species of weed biotypes have been found to be resistant to triazine-type herbicides worldwide. Black