山西大麻苗期生长繁茂,茎秆嫩脆,进行田间人工除草作业难度大,且麻田杂草以阔叶杂草为主,以前研究的对大麻田禾本科杂草的防治方法,都不适合该地区.汾阳大麻试验站开展了除草剂混用对大麻田一年生阔叶杂草防除效果的研究.结果表明,每公顷施56％二甲四氯钠WP 300 g+ 120 g/L烯草酮EC 195 mL对水600 kg/hm2均匀喷雾,可以很好地防除大麻田一年生阔叶杂草,药后30,50 d株防效均大于95％,鲜质量防效达89％以上,株防效与鲜质量防效明显高于单用的对照药剂二甲四氯钠和烯草酮,且产量不受影响.%Artificial weeding in hemp field is difficult,as a result of the hemp's branches and leaves are luxuriant and stem is tender in seedling stage in Shanxi province.Broad-leaved weeds are the main weeds in the hemp field in Shanxi province rather than grass weeds which the researchers committed to control formerly,so we carried out research for this area.We conducted field experiments by herbicide combinations and measured effects on annual broad leaf weeds control under the guidance of experts of National bast fiber plants industrial technology system in Fenyang hemp test station.Through the screening,testing and demonstration of herbicides,the results showed that,spraying 56％ of Chipton WP 300 g + 120 g/L clethodim EC 195 mL add water 600 kg/hm2,could be a good control of annual broad-leaved weeds in the hemp field,effcacy was more than 95％ after 30,50 days,the control effect of fresh quality was more than 89％.The control effects of the plant and the fresh quality were significantly higher than those of the check medicament (Chipton and clethodim),and the yield of hemp was not affected.
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