【摘要】 在冬小麦 1～ 2叶期施用甲磺隆 1.8～ 2 .5 g/hm2 ,可有效防除北京地区麦田常见阔叶杂草 ,优于当前常用除草剂苯磺隆 15 g/hm2 春季施用的除草效果 ,安全性与春季施用苯磺隆 15 g/hm2 相当。实验室降解结果表明 ,当甲磺隆初始浓度为 6.2 5 μg/kg以下时 ,经过2 15 d后 ,对后茬玉米安全。研究表明 ,向日葵是甲磺隆理想的生物测定试材 ,对甲磺隆的最低检出浓度达到 0 .12 5 μg/kg,其根长抑制率与除草剂浓度有高度的相关性 ,最佳的剂量 -反应模型为 y=a+b lnx更多还原

【Abstract】 The broad leaved weeds in winter wheat could be effectively controlled when metsulfuron methyl was applied at the rate of 1.8～2.5 g/hm 2 in autumn in Beijing. The efficacy was higher than that by using tribenuron at the rate of 15 g/hm 2 in spring. The results of degradation in laboratory showed that when the initial metsulfuron methyl dosage was under 6.25 μg/kg, the residue was not harmful to succeeding crop maize after 215 days. A simple and fast bioassay technique was developed for sulfonylurea herbicides. Sunflower was an ideal material for bioassay. The minimum detectable concentration for metsulfuron methyl with sunflower’s root length was 0.125 μg/kg. The optimal dosage response model is y=a+b ln x.更多还原