保护性耕作条件下播后苗前除草剂防除玉米田杂草试验

Experiments on Control Effects of Pre-emergence Spraying of Herbicides on Maize of Conservation Tillage

田间试验结果表明,保护性耕作条件下,除草剂在玉米播后苗前施用,38%莠去津乳油5.25kg/hm2、90%乙草胺乳油2.1kg/hm2、72%异丙草胺乳油2.25kg/hm2、72%2,4D-丁酯1.05kg/hm2,药后45d的总株防效分别为81.40%、80.69%、79.23%和50.47%。而50%滴丁.乙乳油4.2kg/hm2、40%乙.莠悬乳剂5.7kg/hm2、50%滴丁.莠悬浮剂4.2kg/hm2和42%滴丁.异丙草.莠悬乳剂5.7kg/hm2对单、双子叶杂草除草效果均有增效作用,药后45d株防效分别为84.94%、86.33%、89.53%和85.47%。药后混土2～3cm,可提高防治效果,38%莠去津乳油5.25kg/hm2、90%乙草胺乳油2.1kg/hm2、72%异丙草胺乳油2.25kg/hm2、72%2,4D-丁酯1.05kg/hm2、50%滴丁.乙乳油4.2kg/hm2、40%乙.莠悬乳剂5.7kg/hm2、50%滴丁.莠悬浮剂4.2kg/hm2和42%滴丁.异丙草.莠悬乳剂5.7kg/hm2,药后45d的总株防效分别为87.42%、85.61%、84.02%、52.41%、92.74%、91.30%、91.92%和89.42%。

Experiments on control effects of pre-emergence herbicides on maize of conservation tillage were carried out in field. The results showed that the quantity control effects of weeds of 38% atrazine 150 ml/667m^2, 90% acetochlor 140 ml/667m^2, 72% propisochlor 150ml/667m^2, 2,4-D-butyl 70 ml/667m^2 45 days after spraying were 81.40%, 80.69%, 79.23% and 50.47% respectively;But 50% 2,4-D-butyl＋acetochlor, 40% acetochlor＋atrazine, 50% 2,4-D-butyl＋atrazine and 42% 2,4-D-butyl＋propisochlor＋atrazine have improved the control effects and the quantity control effects of weed 45 days after spraying were 84.94%, 86.33%, 89.53% and 85.47% respectively. It could improve the control effect if soil of 2-3cm was mixed up. The quantity control effects of weeds of 38% atrazine 150 ml/667m^2, 90% acetochlor I40 ml/667m2, 72% propisochlor 150 ml/667m^2, 72% 2,4-D-butyl 70 ml/667m^2, 50% 2,4-D-butyl＋acetochlor, 40% acetochlor＋atrazine, 50% 2,4-D-butyl＋atrazine and 42% 2,4-D-butyl＋propisochlor＋atrazine were 87.42% , 85.61%, 84.02%, 52.41%, 92.74%, 91.30%, 91.92% and 89.42%.