Based on field investigation and fixed experimental observation from 2006 ～ 2007 in Beijing suburbs,comparison between the no-tillage and conventional tillage under crop growing and yield was made to analyse the problems during the implementation of no-tillage extension. The results reveal that compared with those in conventional tillage, the emergence and maturity of crops in no-tillage with mulching are later; and the number of plants can be 32％ lower than conventional tillage during emergence and early seedling pulling of no-tillage winter wheat; Compared with conventional tillage, biomass of no-tillage winter wheat can be about 3％ lower, but the underground root is measured 15％ higher over the same period. No-tillage winter wheat can increase production by 2.2％ in dry-spring years, but in rainy-spring years, production drops by 18.37％, and at most by 46.4％; No-tillage increases corm production by 2％ ～ 18％. Prorooting the implementation of no-tillage also needs to strengthen scientific field management and increase govemment suppert and advocacy efforts to ensure the stability of no-tillage grain production and sustained implementation.%通过北京郊区大田调查和定点试验观测,对比研究了免耕覆盖与传统耕作两种措施下作物长势和产量差异,探讨了免耕覆盖技术推广实施中存在的问题.结果表明:与传统翻耕相比,免耕覆盖作物出苗和成熟更晚;免耕冬小麦出苗和生长初期,麦苗密度可低于传统翻耕32%;免耕覆盖玉米出苗和长势往往好于传统翻耕,出苗密度可高于传统翻耕约20%.与传统翻耕相比较,免耕覆盖冬小麦地上生物量可低3%左右,但同期测量地下根量却高15%;免耕冬小麦在春季干旱年份可增产2.2%,而在春季雨水较多的年份却减产18.37%,大田调查最高可造成减产46.4%;免耕覆盖玉米产量一般较高,可高出2%～18%.免耕技术推广实施还需要加强科学的田间管理,加大政府支持力度.
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