Abstract: The effects of 4 post-emergence compound herbicides on weed control, yield and economic income in winter rapeseed field were investigated. The results showed four herbicides including Youbao, Youli, Youda and Youxi were very effective to control grass weeds and Galium spurium. The control effects of weed fresh weight were more than 98% 60 d after spraying herbicide. All four herbicides had little control effect to Veronica persica. The height of rapeseed plant sprayed with Youbao, Youli, Youda and Youxi reduced by 4.64%, 4.96%, 2.61% and 2.99%, respectively. Effective branch number of main stem increased by 5.88%, 7.84%, 13.73% and 13.73%, respectively. Number of effective pods increased by 5.21%, 4.69%, 7.33% and 9.02%, respectively. Plant yield increased by 7.64%, 7.31%, 9.63% and 14.62%, respectively. Economic income increased by 275.0, 175.0, 350.0, 665.0 yuan/hm² after deductions the cost of herbicide and labour, respectively.

Key words: herbicides, weed, control effects, rapeseed yield