几种化学除草剂对甜高粱除草效果的比较

[目的]比较几种除草剂的除草效果。[方法]以甜高粱杂交种“天青一号”为供试作物，防效和株高为指标，通过苗前、苗后大田药效试验，研究几种除草剂的除草效果及对甜高梁的安全性。[结果]在该试验条件下，除草剂莠去津在播后苗前用药量为6．000kg／hm2时防效较好，而在苗后用药量为10．390kg／hm2时防效为佳，并且苗后比苗前用药的除草效果要好。不同除草剂在苗后同一施药时期防除杂草的效果不同。38％莠去津防效均高于72％乳油2，4．滴丁酯和48％排草丹，总防效达到94．7％，且对杂交甜高粱生长影响最小，苗后1次用药即可取得比较理想的除草效果。[结论]该研究为甜高粱地杂草的防治提供了科学依据。

Comparison on Weeding Effect of Several Kinds of Chemical Herbicides on Sweet Sorghum

[Objective] The aim was to compare the weeding effect of several kinds of herbicides.[Method] With sweet sorghum hybrid Tianqing No.1 as tested crop,control effect and plant height as indexes,the weeding effect of several kinds of herbicides and the safety of herbicides on sweet sorghum were studied by field efficacy test of preemergence and postemergence herbicides.[Result] Under the experimental condition,the control effect of atrazine at 6.000 kg/hm2 applied before seedling was better,but that at 10.390 ...