硝磺草酮15悬浮剂防除春玉米田杂草田间药效试验

摘要

为了探求春玉米田苗后茎叶处理安全高效的除草剂防治效果,对硝磺草酮15%悬浮剂防除春玉米田杂草安全性及药效进行了试验研究。结果表明：硝磺草酮15%悬浮剂在春玉米3～4叶期,一年生禾本科杂草3～5叶期,阔叶杂草2～4叶期茎叶均匀喷雾,施药后玉米出现短期褪绿白化药害症状,但对玉米的成熟期及产量无不良影响,平均增产率大于20%,在试验剂量范围内安全性很好。施药后30d对一年生禾本科及阔叶杂草的总株防效大于92%,总鲜重防效大于95%。适宜用量为有效成分135.0～157.5g.hm-2。%In order to explore the safety and efficient herbicides of spring maize stem and leaf postemergence treatment,field trials was done on weeds control efficacy and safety of Mesotrione 15% SC in spring maize field.The results showed that：During 3 to 4 leaf stage of spring maize,annual grass weeds 3~5 leaf stage,broadleaf weeds 2 leaf to 4 leaf stage,Mesotrione 15% SC was sprayed leaf evenly,maize applied chlorotic drug bleaching phytotoxicity of short-term symptoms,but the maturity and the yield of maize without adverse effects,the average increase rate was more than 20%,in the dose range of test security was very good.30 days after spraying,the total strain of the annual grass and broadleaf weed control effect were more than 92%,total fresh weight efficiency were more than 95%.Appropriate amount of active ingredient was 135.0~157.5 g·hm-2.