吡嘧·丙草胺WP防除水稻田一年生杂草的效果及安全性

Efficacy and Selectivity of Pyrazosulfuron·Pretilachlor-ethyl WP on Annual Weeds in Paddy Fields

为明确55%吡嘧·丙草胺可湿性粉剂(WP)对水稻田中稗草、水苋菜、异型莎草、鳢肠、千金子的防效以及对水稻的安全性,进行防除水稻抛秧田一年生杂草的药效试验。结果表明:水稻抛秧后7~10 d用55%吡嘧·丙草胺WP 1 050 g/hm^2拌细潮土225 kg/hm^2人工撒施作土壤封闭处理,可以有效防除稗草、水苋菜、异型莎草、鳢肠、千金子,药后45 d株防效达88.33%,鲜质量防效达93.29%,对总杂草的防效均极显著高于对照药剂375 m L/hm^210%吡嘧磺隆WP、1 200 g/hm^230%丙草胺乳油单剂,对抛秧水稻安全。

The efficacy of pyrazosulfuron· pretilachlor-ethyl 55%WP on Echinochloa crus-galli,Ammannia baccifera, Cyperus difformis,Eclipta prostrata and Euphorbia lathyris and its selectivity to rice seedlings was studied field experi-ments.The mixture at 1 050 g/hm2 combined with fine soil at 225 kg/hm2 as a pre-emergentce treatment,effectively controlled the five weed species.At 45 days after treatment,weed control was 88.3% with a fresh weight reduction of 93.3%.Pyrazosulfuron· pretilachlor-ethyl 55% WP provided significantly better control than pyrazosulfuron-ethyl 10%WP wat 375 mL/hm2 and pretilachlor 30%EC at 1 200 g/hm2 ,having selectivity to rice seedlings.