85%丙草胺EW对水稻移栽田一年生禾本科杂草的防除效果

Control Effects of 85% Pretilachlor EW on the One-year-old Gramineous Weeds in Rice Transplanting Field

[目的]明确85％丙草胺EW对水稻移栽田一年生杂草的防除效果、最佳使用剂量和对水稻秧苗的安全性。[方法]采用小区试验研究85％丙草胺EW对水稻一年生禾本科杂草的防除效果和对水稻的安全性。[结果]水稻秧苗移栽至经过水整理的稻田后5～7 d施用85％丙草胺水乳剂，施药量为有效成分535．5～612．0 g／hm2（制剂用量630～720 mL／hm2），按照300 kg／hm2用量拌成毒土（沙）后均匀撒施水稻田，田间保持3～5 cm水层5～7 d，防除效果较好，且对水稻秧苗安全。[结论]85％丙草胺EW对水稻移栽田一年生禾本科杂草有良好的防除效果，可在水稻移栽田中广泛使用。

Objective] To find the control effects and the optimal use dosage of 85% pretilachlor EW on the one-year-old gramineous weeds in rice transplanting field, as well as the safety of rice seedling.[Method] Plot test was used to research the control effects of 85%pretilachlor EW on the one-year-old gramineous weeds in rice transplanting field, as well as its safety on rice.[Result] After the rice seedling was transplanted to rice field after water processing for 5-7 d, 85% pretilachlor EW was applied;and the effective component of application rate was 535.5-612.0 g/hm2（preparation dosage was 630-720 mL/hm2）.Under the dosage of 300 kg/hm2, poisoned soil （sand） was obtained and sprayed to rice field.The water layer in field was maintained at 3-5 cm for 5-7 d.The control effect was relatively good and was safe to the rice .[ Con-clusion] 85% pretilachlor EW has relatively good control effects on one-year-old gramineous weeds, and can be widely applied in rice transplan-ting field.