20%烯草酮·二氯吡啶酸·氨氯吡啶酸可分散油悬浮剂对直播油菜田杂草的防治效果

Control Effect of 20%Picloram·Lopyralid·Clethodim OD on Weeds in Direct Seeding Rape Field

于2020—2021年开展田间试验,探究了20%烯草酮·二氯吡啶酸·氨氯吡啶酸可分散油悬浮剂对直播油菜田中稻槎菜、苣荬菜和看麦娘3种杂草的防除效果及其安全性。结果表明:施用20%烯草酮·二氯吡啶酸·氨氯吡啶酸可分散油悬浮剂能有效去除3种杂草,有效成分施用量为180~300 g/hm^(2),施药后25 d,总草的株防效为88.06%~95.37%;施药后85 d,总草株防效和鲜重防效分别为85.44%~92.33%、85.52%~93.05%,均显著优于其他3种对照药剂,且不产生药害;施药后的油菜产量均值为3.95~4.12 kg,增产率为84.58%~92.52%,明显高于其他3种药剂处理和空白对照,且略高于人工除草处理。综上,对杂草的防治效果会随着施药量的增加而提高,最佳施药期为油菜田杂草3~5叶期,建议生产中有效成分的最佳施用量为225~300 g/hm^(2)。

In order to make clear the control effect and safety evaluation of 20%picloram·clopyralid·clethodim OD on Lapsana apogonoides,Sonchus brachyotus and Alopecurus aequalis in direct seeding spring rape fields,field efficacy trials conducted from 2020 to 2021.The results showed that application of 20%picloram·clopyralid·clethodim OD could effectively control three kinds of weeds.When the herbicide is applied at the effective dosages of 180~300 g/hm^(2),the weed control effect was 88.06%~95.37%after 25 days,and the weed plant control effect and the weed fresh weight control effect were 85.44%~92.33%and 85.52%~93.05%after 85 days,which were significantly better than the other three control drugs,and no harm was caused.The average yield of rapeseed was 3.95~4.12 kg after application,and the growth rate was 84.58%~92.52%,which were significantly better than the other 3 control drugs and blank control,and slightly higher than the artificial weeding treatment.The control effect on weeds increased with the increase of dosage.The best application period is 3~5 leaf stage of weeds in rape field.It is suggested that the herbicide is applied at the effective dosages of 225~300 g/hm^(2) in production.