华北一年两熟区的农作物秸秆机械化粉碎直接还田技术推广起步于20世纪80年代中后期,普及于21世纪初。该技术的推广得益于政府的禁烧和对农民购买秸秆还田机具实行的补贴政策,为实施机械粉碎还 North China one year two ripening crop straw mechanized crushed directly into the field technology promotion started in the late 1980s, popularized in the early 21st century. The promotion of this technology benefits from the government’s ban on burning and subsidies for the purchase of straw returned to farmers by farmers,