Northern cold region china-hemp field weed chemical weeding method

The invention belongs to the technical field of agricultural planting, and particularly relates to a northern cold region china-hemp field weed chemical weeding method. The method comprises the following steps of 1, sealing soil; using 96-percent metolachlor for performing soil spraying sealing treatment; 2, performing stem and leaf treatment: using 56-percent MCPA-Na powder and 24-percent clethodim emulsifiable concentrates for mixing for stem and leaf treatment in the 3-leaf period of the weed according to the weed coming-up conditions. The method solves the generally exiting problems of laggard culture measure, single weed prevention and control technology and no special china-hemp weeding agent in the market after the scaled planting of the china-hemp. By using the method for chemically removing field weed of the china-hemp, the prevention effect on the weed is as high as 87.56 percent; the field weed harm of the china-hemp can be basically eliminated; after the pesticide application, inhibition and pesti