氯吡·硝·烟嘧50%水分散粒剂防除春玉米田杂草田间防效初探

通过田间试验验证50%氯吡·硝·烟嘧水分散粒剂对春玉米田禾本科杂草、阔叶类杂草、莎草的防除效果、杀草谱及安全性,探索出最佳用量和用药时期。试验结果表明:50%氯吡·硝·烟嘧水分散粒剂对禾本科杂草、阔叶类杂草、莎草有较好的防除效果,在玉米3—5叶期,杂草3—6叶期茎叶喷药一次,制剂用药量240~600 g/hm~2,药后15天,对杂草防除效果达66.1%~85.7%;药后30天对杂草防除效果达88.8%~100%;药后45天对杂草防除效果达90.88%~100%,并且随着用量的增加,防效提高;春玉米生长从喷药后到成熟都正常,整个生育期没有药害发生;说明该药剂防除春玉米田杂草时对春玉米是安全的,也未发现对其他非靶标生物产生影响。最佳用量为300~320 g/hm~2;

Control Efficiency of Fluroxypyr· mesotrione· nicosulfuron 50％ WDG Against Weeds in Spring Corn Field

The control efficiency of fluroxypyr · mesotrione · nicosulfuron 50％ WDG on grassy weeds,broadleaf weeds and sedge,and its herbicide controlling spectrum and safety were studied by field experiments,and the optimal dosage and medication time were explored.The results showed that under stem spraying at the stage of corn 3-5 leaves and weed 3-6 leaves with the dosage of 240-600 g/hm2,fluroxypyr· mesotrione·nicosulfuron 50％ WDG had better control efficiency on grassy weeds,broadleaf weeds and sedge,the control efficiency after 15 d reached 66.1％-85.7％ the control efficiency after 30 d reached 88.8％-100％ and the control efficiency after 45 d reached 90.88％-100％,and the control efficiency increased with the dosage.There was no phytotoxicity occurred during the whole growth period after application,which indicated that the agent was safe to spring maize,and it also had no impact on other non-target organisms.The best dosage was 300-320 g/hm2.