磺酰脲类除草剂对玉米的安全性及在土壤中降解动态研究

Studies on Safety of Sulfonylurea Herbicides to Maize and Degradation Dynamics in Soil

采用室内模拟添加法、盆栽法,研究了噻磺隆、苄嘧磺隆、苯磺隆3种磺酰脲类除草剂对不同玉米品种的安全性及对玉米幼苗的影响,同时,对3种磺酰脲类除草剂在土壤中的降解动态进行了研究。结果表明:供试玉米品种对3种磺酰脲类除草剂存在不同程度的敏感性差异,该类除草剂ED10 以上剂量对玉米苗期的根长、株高、叶面积有明显的影响;苯磺隆、噻磺隆和苄嘧磺隆在土壤中降解的半衰期分别为3.6d、6 .3d、15 .4d。在推荐剂量下。

Studies on the methods of indoor modeling addition and pot culture showed that there was different sensitivity of different maize varieties to 3 kinds sulfonylurea herbicides.The concentration of 3 kinds of sulfonylurea herbicides beyond ED 10 had obvious effect on length of roots, height of plant, area of leaves in maize seedling. The half life of tribenuron, thifensulfuron methyl and bensulfuron methyl was 3.6 d, 6.3 d,15.4 d respectively.Under the application dose that used in the wheat field,only the tribenuron methyl among 3 kinds of sulfonylurea herbicides resulted in damage to the next maize crop.