保护性耕作是指少耕、免耕、残茬覆盖和合理轮作技术，这是农业的可持续发展技术，其实质是尽量减少耕作次数、减少水土流失、创造好的生态环境，达到高产、低耗、保护环境的目的。美国早在４０年代就开始提出保护性耕作技术，经过几十年的试验、研究，于７０年代后期趋于... Conservation tillage refers to the technology of reducing tillage, no-tillage, stubble covering and reasonable rotation, which is the sustainable development of agriculture. Its essence is to minimize the number of tillage, reduce soil erosion and create a good ecological environment, and achieve high yield and low yield Consumption, the purpose of environmental protection. As early as the 1940s, the United States began to propose conservation tillage techniques, and after decades of experiments and studies, it became increasingly popular in the late 1970s.