除草剂“玉宝”防除玉米地杂草的效果Ⅱ.不同使用剂量的除草效果

Effects of weed control yubao herbicide in maize Ⅱ. Study on different dose of Yubao herbicide

新型除草剂玉宝在延边地区玉米 3叶期使用时 ,适宜使用剂量为 90 0～ 1 1 0 0 gai/hm2 .在适宜剂量条件下对藜、苋科类、鸭跖草、风花菜的防效达 1 0 0 % ,对禾本科杂草稗草防效在90 %以上 ,对禾本科杂草马唐与菊花科杂草刺儿菜防效在 70 %以上 .综合杂草防效可达 90 % .

This paper summarizes the efficiency of weed control of “Yubao”, a new type of herbicide, when the maize grew the third leaf in the North of China. The appropriate dose to apply is 900～1 100 g ai/hm 2. According to this dose, the chenopodiaceae, the amaranthaceae and the cruciferae are killed completely. The rate of weed control is 90% and the digitaria sanguinalis(L.) Scop and cephalanoplos segetum(Bge) Kite is over 70%. The total rate of weed control to all kind of weed can achieve 90%.