[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 kg/hm2 applied after seedling was better, and the weeding effect of atrazine applied after seedling was better than that applied before seedling. The weeding effect of different herbicides applied in the same period after seedling was different. The control effect of 38% atrazine were all higher than that of 72% 2,4-D and 48% bentazone, and its total control effect reached 94.7%. Atrazine had least influence on the growth of hybrid sweet sorghum and the more ideal weeding effect could be obtained with only application once. [Conclusion] The research provided the scientific basis for the control of weeds in sweet sorghum field.%[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粱的安全性.[结果] 在该试验条件下,除草剂莠去津在播后苗前用药量为6.000 kg/hm2时防效较好,而在苗后用药量为10.390 kg/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.
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