甲磺隆的应用技术及对后茬作物的安全性研究

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 15g/hm2 春季施用的除草效果 ,安全性与春季施用苯磺隆 15g/hm2 相当。实验室降解结果表明 ,当甲磺隆初始浓度为 6.25μg/kg以下时 ,经过215d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 0.125μg/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

The Application Technique of Metsulfuron methyland Safety to Succeeding Crop

The broad-leaved weeds in winter wheat could be effectively controlled when metsulfuron methyl was applied at the rate of 1.8～2.5g/hm2 in autumn in Beijing. The efficacy was higher than that by using tribenuron at the rate of 15g/hm2 in spring. The results of degradation in laboratory showed that when the initial metsulfuron-methyl dosage was under 6.25μg/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 0.125μg/kg. The optimal dosage response model is y=a+b lnx.