不同土壤处理除草剂对棉田杂草防除效果及安全性

Control Effect and Safety of Different Soil-applied Herbicides in Cotton Field

为筛选出适宜本地区土壤处理的除草剂。通过大田小区试验,采用土壤封闭处理,对比分析了7种土壤处理除草剂对棉花安全性和杂草防除的效果。结果显示,与对照相比,不同药剂处理对‘冈棉11号’出苗率和第一果枝结位均没有显著性差异,但鲜重、株高和果枝数有增加趋势,表明试验药剂对棉花安全。田间药效结果显示,复配剂50%扑草净可湿性粉剂(WP)+33%二甲戊灵乳油(EC)、50%扑草净WP+960 g/L精异丙甲草胺EC和50%扑草净WP+50%乙草胺EC对禾本科和阔叶杂草均具有较好防效,45 d平均鲜重防效分别为83.32%、84.08%、80.57%,与单剂处理均存在极显著差异,且持效期较长,建议3种复配剂作为土壤处理除草剂用于棉田杂草防除。

In order to screen out suitable soil-applied herbicides in this area,the safety and weed control effects of seven soil-treated herbicides on cotton were compared and analyzed by using soil sealing treatment in field plot experiment.The results showed that there was no significant difference in the germination rate and first section of branch of‘Gangmian No.11’under different treatments compared with the control,but the fresh weight,plant height and the number of fruit branches increased,indicating that the soil-applied herbicides were safe for cotton.The results of field efficacy showed that 50%prometryn wettable powder(WP)+33%pendimethalin emulsifiable concentrate(EC),50%prometryn WP+960 g/L metolachlor EC and 50%prometryn WP+50%acetochlor EC had better control effects on grasses and leaved weeds.The average fresh weight control effect of 45 d was 83.32%,84.08%and 80.57%,respectively,which were significantly different from that of single treatment,and the lasting time was longer.50%prometryn WP+33%pendimethalin EC,50%prometryn WP+960 g/L metolachlor EC and 50%prometryn WP+50%acetochlor EC are recommended to be used for weed control in cotton field.