在一定的生产周期内少耕或不耕不耙不中耕,依靠生物(包括作物根系、土壤微生物等)活动进行土壤耕作并结合化学除草,即称之为少耕法或免耕法。目前,国外在玉米、小麦、水稻、棉花等作物上应用了免耕法。我国甘肃的沙田就是一种特殊类型的免耕法,东北的轮耕制和耙茬播种也属于少 In a certain period of production of less or no plowing without raking non-tillage, relying on biological (including crop roots, soil microorganisms, etc.) activity of soil cultivation and combined with chemical weeding, which is called tillage or no tillage. At present, no-till method has been applied abroad on crops such as corn, wheat, rice and cotton. Shatian in Gansu Province of China is a special type of no-till method. In Northeast China, crop rotation and cropping are also less