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近十年来推广的少免耕作为稻、麦（包括油菜）连作区的常规耕作方法，已暴露出下面两个问题：（1）耕层变浅，下耕层土壤肥力降低；（2）年际间相同的耕作方式造成相似的土壤生境，有利于某些害虫、杂草的繁衍，加重其危害。解决上述问题的主要对策就是要确立“久免需耕、久浅
The following two problems have been uncovered in the conventional farming methods promoted in the past ten years: (1) shallow plow layer and lower soil fertility of lower plow layer; (2) year The same tillage practices result in similar soil habitats and are conducive to the multiplication of certain pests and weeds, which aggravate their harm. The main countermeasure to solve the above problems is to establish "long-term need to cultivate, long time shallow