Abstract:In order to study the effects of maize straw returned to the field and different tillage patterns on dry matter accumulation and translocation of nitrogen (N),phosphorous (P) and potassium (K) of winter wheat in lime concretion black soil region,this experiment was carried in the field by means of winter wheat cultivar ‘Yannong 19’ as material.The result shows that:(1)In maturing period,the main accumulating organ for dry matter and nutrients is grain,then stem and leaf.The contribution of dry matter weight (DW),N,P and K accumulation in grains occupy 43.31%~46.13%,75.14%~76.83%,75.79%~77.99% and 12.37%~12.82%,respectively in the upper part of the wheat.In nutrition organ,the highest accumulation and translocation amount of dry matter and nutrients before anthesis occur in leaf,then in stem and glume and spike-stalk.The contribution of DW,N,P and K that be translocated from nutrition organ to grains are 30.40%~36.54%,81.86%~86.10%,65.34%~74.83% and 98.91%~125.85%,respectively.(2)The amount of accumulation and translocation of DW and nutrients in the treatment of returning maize straw to the field are significantly higher than those in treatment in which no straw returned to the field.Under the condition of returning maize straw to the field,the amount of accumulation and translocation of DW in treatment HG (whole maize straw returned to the field with mulching tillage after smashing) is significantly higher than those of HM (whole maize straw returned to the field with overturning after samshing) and HX (whole maize straw returned to the field with rotary tillage after samshing),whereas there is no significant difference of accumulation and translocation of N,P and K among these three tillage patterns.