种植模式对棉田土壤处理除草剂除草效果的影响

露地直播棉田苗期除草,可以选用50%乙草胺EC5、0%扑草净WP和33%二甲戊乐灵EC。地膜覆盖棉田9,6%精异丙甲草胺EC4、8%氟乐灵EC5、0%萘丙酰草胺WP5、0%扑草净WP和48%仲丁灵EC对棉田杂草的防效较理想,药后45 d的株防效仍能达到83%以上。金都尔等7种除草剂在露地直播棉田中使用对棉苗生长无影响,而在地膜覆盖棉田使用乙草胺和二甲戊乐灵应慎重,浓度过高易对棉花幼苗产生药害。

Effect of Cropping Patterns on Control Efficacy of Soil-Applied Herbicides in Cotton Fields

Seven soil-applied herbicides were sprayed on pre-emergent cotton to study their weed control efficacy and safety to cotton in the direct seeding cotton field and film mulch cotton field.The results showed that 50% acetochlor EC,or 50% prometryn WP or 33% pendimethalin EC could be used in the direct seeding cotton field.Excellent weed control effect could be obtained with 96% s-metolachlor EC,or 48% trifluralin EC,or 50% napropamide WP,or 50% prometryn WP,or 48% dibutalin EC in the film mulch cotton field.At 45 d after application,they provided control efficacy against 80% of cotton field weed.The cotton seedling growth was not significantly influenced by all herbicides in the direct seeding cotton field,while injuries of cotton seedling were caused by the herbicides acetochlor and pendimethalin at high concentrations in the film mulch cotton field.