【Objective】A typical double cropping of winter wheat and summer maize is practiced in Huang-Huai-Hai Plain. This study is to explore the effects of tillage methods before sowing both winter wheat and summer maize on yield formation of summer maize, to find which is helpful to improve the tillage system of double cropping for high yield and high efficiency in Huang Huai Hai Plain.【Method】Summer maize hybrid Zhengdan958(ZD958) was used as experimental materials. Three tillage treatments were designed in this ...