5种除草剂对水稻移栽田杂草的封闭除草效果

Study on the Blocking Effect of Five Herbicides on Weeds in the Rice Transplanting Field

为筛选水稻移栽田封闭除草高效安全的药剂,选择5种常用封闭除草剂进行水稻移栽田除草田间药效试验。结果表明:复配药剂30%苄嘧·丁草胺可湿性粉剂450 g/hm^(2)(有效成分,下同)防治效果最好,高达96.9%;经方差分析,药后15 d 30%苄嘧·丁草胺可湿性粉剂总草防效与380 g/L噁草酮悬浮剂处理总草防效无显著性差异;药后30 d,15%丙块噁草酮可分散油悬浮剂、50%丙草胺乳油、380 g/L噁草酮悬浮剂的总草株防效、鲜重防效均与复配药剂30%苄嘧·丁草胺可湿性粉剂无极显著性差异;240 g/L乙氧氟草醚乳油72 g/hm^(2)对稗草、莎草防效差,对阔叶杂草效果好。建议在水稻移栽田封闭除草时与禾本科、莎草科类除草剂混用。

In order to screen efficient and safe herbicides for closed weeding in the rice transplanting field,five common closed herbicides were selected for the field efficacy test of weeding in the rice transplanting field.The results showed that the compound agent bensulfuron methyl·butachlor 30%WP applied at 450 g/hm^(2)(effective component,the same below)had the best control effect,up to 96.9%.By analysis of variance,there was no significant difference in the control effect on the total weed number between oxadiazon 380 g/L SC and bensulfuron methyl·butachlor 30%WP,15 days after application.Thirty days after application,the control effect of oxadiargyl 15%OD,pretilachlor 50%EC and oxadiazon 380 g/L SC on the total weed number and fresh weight each was not significantly different from that of bensulfuron methyl·butachlor 30%WP;oxyfluorfen 240 g/L EC applied at 72 g/hm^(2)had poor control effects on barnyard grass and sedge,but it had excellent control effects on broadleaf weeds.Therefore,it is suggested to mix with Gramineae and Cyperaceae herbicides in closed weeding in the rice transplanting field.