50%乙草胺乳油防除夏大豆田杂草药效试验

试验结果表明,50%乙草胺乳油防除夏大豆田杂草,在用药量1800～4200ml/hm2范围内,对大豆的生长发育影响较小,可有效地防除马唐、藜、反枝苋、马齿苋等一年生杂草。施药后30d,株防效达87.9%～98.8%;施药后45d,株防效达94.9%～98.6%,鲜重防效达67.0%～98.2%。增产效果为10%～14%。最佳用药量以2400ml/hm2为宜,施药适期以夏大豆播后1～2d为好。

Effect of 50 % Acetochlorruyou to Control Weeds in Soybean Fields

The result for two years trial proves that 50% acetochlor prevents and gets rid of the weeds in soybean fields. Within the Scope of using pesticide 1 800～4 200 ml/hm2,it affects a little for the growth of the soybean and can prevent and get rid of the annual weeds like Digitaria sanguinal, Chenopdium album,Amaranthus retrofiexus,Spring beauty and so on. In 30 days after using pesticide, the preventing effect is 87.9%～98.8% for each plant. In 45 days after using pesticide, the preventing effect is 94.9%～98.6% for each plant. Fresh and heavy effect is 67.0%～98.2%.The effect to increase production is 2.8%～10.7%. It' s better to use pesticide 2 400 ml/hm2 and to use pesticide 1～2days after sowing.