1 round of change. In the regions with better water conservancy conditions, the “three-three†system for rice and wheat, rapeseed and green manure is adopted; the green manure field often plows rice from April 20 to 30. At this time, Aunt Mai, Japanese Acacia, and Hard Weed seeds such as grasses have been extirpated when they have not matured, and the number of weeds in rape (or wheat) fields grown in the fall has been significantly reduced. Due to the lack of efficient and safe herbicides to control broad-leaved weeds in rapeseed fields, rapeseed fields with severe damage to broad-leaved weeds can rotate with wheat, jade, rice, soybeans, and other crops. The herbicides Longjing, Yizhu water suspoemulsifier, bean curd, comfoil pine, chlorfluazuron, acifluorfen and other herbicides reduce the occurrence of broadleaf weeds and then plant rapeseed.
2 Before planting or transplanting. Ammonium, Metolachlor, Alachlor, Butachlor, Valerian, Herbicide, Napropamide, Chlorochlor, Pendimethalin and other soil treatment agents to control 1 year old grass weeds and some Small-leaved broadleaf weeds.
4 Post-emergence control. Can be used clethodim, high-efficiency flupirtine, fine quizalofop, ene acridine, albuterin to treat stems and leaves to prevent grass weeds, with grass removal Ling, ethametsulfuron to do stem and leaf treatment Broad-leaved weeds. Chemical weeding should avoid the use of a single herbicide for many years in order to prevent the dominant weeds from being controlled, and some secondary weeds produce resistance or resistance to the hazard caused by dominant weeds. Herbicide spectrum and effects should be used. Herbicides with different mechanisms are alternately used or mixed.
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