不同除草剂对紫云英田阔叶杂草的防除效果及安全性评价

通过田间药效试验,比较了5种除草剂在紫云英田的适用性及其对阔叶杂草的防效。结果表明,紫云英田块春后化除使用56%2-甲-4-氯钠可湿性粉剂900 mL/hm~2和48%灭草松水剂2 700 m L/hm~2均未对紫云英产生药害,并可有效防除阔叶杂草,对阔叶杂草株防效及鲜重防效可达70%以上;与清水对照相比,紫云英鲜重分别提高47.92%、60.42%,紫云英结实量分别增加22.72%、31.82%。

Control Effect and Safety Evaluation of Different Herbicides on Broadleaf Weeds in Astragalus sinicus Field

Applicability and weed control effects of different herbicide in Astragalus sinicus fieldAbstract: Field experiments were conducted to determine the applicability and their control effects of five kinds of herbicide on broadleaf weeds in Astragalus sinicus field. The results indicated that applications of 56% MCPA-Na WP (900ml?ha-1) and 48% Bentazone (2700ml?ha-1) in March showed no damage to A. sinicus and efficiently controlled broadleaf weeds in A. sinicus field. After the application of above two herbicides, the control efficacies based on plant number and fresh weight for broadleaf weeds were more than 70%. Compared to the check treatment, the fresh weight of A. sinicus was increased 47.92% and 60.42% respectively and the seed yield of Astragalus sinicus was increased 21.72% and 31.67% respectively.