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.

Oats  /  Phenoxycarboxylic acid herbicides  /  2，4-D herbicides