不同除草剂对寒地湿润直播稻田杂草的防除效果及安全性评价

摘要

杂草是影响水稻直播田高产、稳产的重要因素之一,为了筛选适合寒地水稻湿润直播田的除草剂,研究了不同时期施用不同除草剂对湿润直播田杂草的防除效果及对水稻产量和安全性的影响.结果表明:播前封闭施用40%苄嘧·丙草胺或40%苄嘧·丙草胺+38%苄·噁·丙草胺,2叶1心期施用55%吡嘧·丙草胺或55%吡嘧·丙草胺+38%苄·噁·丙草胺,5叶1心期施用480 g·L-1灭草松+36%二甲四氯钠·氯氟吡可高效防除直播田禾本科杂草、莎禾科杂草和阔叶杂草.直播稻的出苗情况、生长发育动态和产量性状分析结果表明,这些药剂在生长期施用没有产生明显的药害.%Weedsare is an important factor which influence the high and stable yields of direct seeding rice.In order to select the herbicides suitable for the wed direct seeding rice in cold region,different herbicides were chosen to investigate their control effects on weeds and safety on crop during rice growing season.The results showed that application of 40% bensulfuronmethyl·pretilachlor or 40% bensulfuronmethyl·pretilachlor add 38% bensulfuronmethyl·clomazone·pretilachlorbefore sowing,55% pyrazosulfuron-ethyl·pretilachlor or 55% pyrazosulfuron-ethyl·pretilachlor add 38% bensulfuronmethyl·clomazone·pretilachlor at 2-leaf stage of rice,480 g·L-1 bentazone add 36% mpca sodium monosultap·fluroxypyr at 5-leaf stage of rice,respectively,controlled weeds effectively.The results of seedling emergence,growth and development and yield of direct seeding rice showed that the application of those pesticides in wed direct seeding rice paddy fields had no damage to rice.