Abstract: Herbicide prevention and control of weeds in the field is a common weed control method for field crops. At present， China’s Ministry of Agriculture and Rural Affairs has not yet passed the registration of any herbicide on oats. Therefore， it is of great reference and guiding significance to explore the effects of phenoxycarboxylic acid （2，4-D derivative） herbicides on weed control and oat grass yield in oat fields. In this study， the ‘Zhongcao No.16’ oat variety was used as the background oat. By setting up 8 different components， dosage treatments and a blank control treatment， foliar spraying was carried out at the jointing stage of oats. The fresh grass yield of oats and the control effect of weed plant numbers and fresh weight were measured at the milky stage of oats. The results showed that the four phenoxy carboxylic acid herbicides had different degrees of control effects on the number and fresh weight of quinoa and Artemisia， but had no control effect on gramineous weeds， and had a certain yield increase effect on oat fields. On the whole， 2.5 mL and 5 mL 2，4-D dimethylamine salt， 4 mL and 8 mL 2，4-D isooctyl ester were suitable for weed control of quinoa and artemisia in oat field， and had a certain yield-increasing effect on oat.

Key words: Oats, Phenoxycarboxylic acid herbicides, 2，4-D herbicides

摘要： 除草剂防控田间杂类草是大田作物常用的杂类草控制手段，目前我国农业农村部尚未通过任何除草剂在燕麦上的登记，因此探索苯氧羧酸类（2，4-D衍生物）除草剂对燕麦（Avena sativa L.）田中杂类草防效和燕麦草产量的影响在种植燕麦上有重要的参考和指导意义。本研究以‘中草16号’燕麦品种为本底燕麦，通过设置8个不同成分、用量的处理及1个空白对照处理，在燕麦拔节期进行叶面喷雾用药，到燕麦的乳熟期对燕麦的鲜草产量及杂类草株防效、鲜重防效进行测定。结果表明：4种苯氧羧酸类除草剂对藜和蒿的株数和鲜重有不同程度的防除效果，但对禾本科杂类草没有防除效果，且对燕麦田有一定的增产效果。综合来看，2.5 mL与5 mL 2，4-D二甲胺盐、4 mL与8 mL 2，4-D异辛酯均适宜用于燕麦田中藜、蒿的杂类草防除，且对燕麦具有一定的增产作用。

关键词: 燕麦, 苯氧羧酸类除草剂, 2，4-D类除草剂