少免耕对夏玉米灌浆过程和产量的影响

采用5种土壤耕作方式在山东龙口进行田间试验。结果表明:不同耕作处理中夏玉米的灌浆速率符合“S”型曲线,可与Logistic方程Y=k/(1+ae-bt)很好的拟合。相对于常规耕作,耙耕秸秆还田方式能提高叶面积指数和灌浆速率,增产14.5%,与旋耕秸秆还田方式无明显差异,而免耕秸秆覆盖方式减产11%。

Effects of Minimum and No Tillage on Seed Filling and Yield of Summer Maize

Soil tillage practices can affect total nitrogen and yield of summer maize.In order to study the impacts of minimum and no tillage on leaf area index,grain filling rate and crop yield under winter wheat-summer maize cropping system,five tillage systems were adopted in Longkou city,Shandong province.The five tillage practices included conventional tillage without straw return,conventional tillage with straw return,rotary tillage with straw return,serrated disk harrow tillage with straw return,and no-tillge with straw return.Results showed that seed filling rates of summer maize under all tillage practices were well fit to the Logistic equation Y=k/(1 ae~(-bt)).Compared to conventional tillage,serrated disk harrow tillage can improve leaf area index and seed filling rate and increase maize yield by 14.5%.However,no-tillge with straw cover decreased maize yield by 11%.