84%双氯磺草胺水分散粒剂对大豆田阔叶杂草的防效及对后茬作物的安全性

Efficacy of Diclosulam 84% WDG on Broadleaf Weeds in Soybean Fields and Its Safety to Succeeding Crops

为考察84%双氯磺草胺水分散粒剂对大豆田阔叶杂草的防除效果及对后茬作物的安全性,在四川地区开展田间试验。选择25.2、37.8、50.4、75.6 g a.i./hm^284%双氯磺草胺水分散粒剂4个剂量进行杂草防除试验,选择25.2、37.8、50.4 g a.i./hm^23个剂量进行后茬安全性试验。结果表明,84%双氯磺草胺水分散粒剂作为土壤处理剂可有效防除田间主要阔叶杂草凹头苋、辣子草、铁苋菜、叶下珠,在施药46 d后,4个剂量处理总阔叶杂草的株防效在95.09%~99.69%之间,鲜质量防效均高于99%;84%双氯磺草胺水分散粒剂的推荐剂量为25.2~50.4 g a.i./hm^2。大豆田施用推荐剂量的84%双氯磺草胺水分散粒剂,对后茬蚕豆、油菜、小麦的出苗率(或存活率)、株高、生物量、分枝数(或分蘖数)和产量的影响较小,种植安全。

Field experiments were conducted in Sichuan Province to study the efficacy of diclosulam 84% WDG on broadleaf weeds in soybean fields and its safety to succeeding crops.Diclosulam 84% WDG at 25.2,37.8,50.4 and 75.6 g a.i./hm^2 was applied to determine its weed control efficacy; its safety to succeeding crops was determined using the first three rates Diclosulam 84% WDG used as soil treatment effectively controlled the main broadleaf weeds including Amaranthus lividus L.,Galinsoga parviflora Cav.,Acalypha australis L.and Phyllanthus urinaria Linn.The individual control effects of total broadleaf weeds were 95.1% to 99.7%,the fresh biomass control effects of all were more than 99%,46 days after application of diclosulam 84% WDG.The appropriate recommended dose of diclosulam 84% WDG is 25.2 to 50.4 g a.i./hm^2.When the recommended dose of diclosulam 84% WDG was applied in soybean fields,it had little impact on emergence rate(or survival rate),plant height,biomass,number of branches(or tiller number) and yield of broad bean,rape and wheat,which could be safely planted after the harvest of soybeans.