Abstract: 【Objective】To guide the efficient and safe use of herbicide in carrot field,and to screen the best use and application of herbicide in soil sealing before seedling.【Methods】To study the effect of different treatments on the control of weeds in carrot field,4 herbicides was used（450 g/L pendimethalin CS,330 g/L pendimethalin EC,480 g/L trifluralin EC,960 g/L refined metolachlor EC）,2 adjuvants and different application methods,with clean water spraying as a control,a total of 13 treatments in carrot field of Wusutu Town of Inner Mongolia.【Results】Among the 4 herbicides tested,the control effect of 960 g/L refined metolachlor EC on grassy weeds was significantly lower than that of 480 g/L trifluralin EC and 330 g/L pendimethalin EC（P<0.05）;3 000 mL/hm² 480 g/L trifluralin EC+300 mL/hm² adjuvant 1 had the best weed control effect compared different application doses. The control effect of grassy weeds was 93.12%,and the control effect of broad-leaved weeds was 87.88%;2 205 mL/hm² 450 g/L pendimethalin CS+300 mL/hm² adjuvant 1 treatment had the best weed control effect,and the control effect of grassy weeds and broad-leaved weeds was 99.10% and 92.51%,respectively.【Conclusion】Pre-seedling herbicide in carrot field was 2 205 mL/hm² 450 g/L pendimethalin CS+300 mL/hm² adjuvant 1.

Key words: Carrot field, Herbicides, Weed, Control effect