关于施肥与小麦或玉米产量及肥料利用均有许多研究,但都侧重于单季作物或当年情况。1993年刘纯敏等经过七年定位试验,了解了长期施肥后耕层土壤养分和作物产量的动态规律。本研究试图通过对长期的不同施肥与小麦玉米两熟年际间产量变化,氮、磷肥利用率变 Much research has been done on fertilization and wheat or maize yield and fertilizer use, but all focus on single-crop crops or current year conditions. In 1993 Liu Chun-min, after seven years of positioning test to understand the long-term fertilization topsoil nutrients and crop yield dynamic law. In this study, we tried to study the effects of long-term fertilization and yield changes of wheat-wheat inter-annual