Effects of soil tillage and returning straw to soil on wheat growth status and yield

The studies were conducted on the effect of two single practices, including soil tillage and returning straw to soil, and the interaction on winter-wheat growth status and yield components. In the experiment, the growth status and yield components of different treatments were investigated. Eight treatments were from the combination of four tillage practices, conventional tillage(C), zero-tillage(Z), harrow-tillage(H) and subsoil-tillage(S) included, and absent straw(A) or present straw(P). The preliminary results showed that field seedling emergence rate, growth status and yield components were significantly affected by different tillage systems. The field seedling emergence rate in Z treatment was only 60.2%. Its yield was significantly lower than C because of the deficient population. The yields of H and S were both higher than C because of that the kernel per spike and weight of 1000 kernels were both higher than C and the growth status of them was proper. The increasing rates were 8.15% and 6.91%. Through the analysis of affecting force. It can be concluded that independent effect of soil tillage is the most important factor to growth status and yield components. Its affecting force is superior to that of straw management and their interaction.