麦套夏玉米往往施基肥少,且苗期与小麦共生,争肥争光矛盾突出,幼苗多数黄弱。麦收后,气温升高,玉米茎叶迅速生长,很快进入拔节期,需要大量养分。因此,必须早施、多施化肥才能满足玉米快速生长的需要。玉米拔节后,生长中心由根系转向生长旺盛的茎叶,雄穗开始分化,对养分的需求迫切,及时追好拔节肥,不仅能为雌穗小花分化提供物质基础,而且能促根壮秆,为 Wheat maize summer maize tend to base less, and the symbiotic seedling and wheat, fight fertilizer highlight the contradiction between light and light, the majority of yellow seedlings weak. After the wheat harvest, the temperature increases, the rapid growth of corn stems and leaves, quickly into the jointing stage, requires a lot of nutrients. Therefore, we must apply as soon as possible, more fertilizer to meet the rapid growth of corn needs. Corn jointing, the growth center from the root to the vigorous growth of the stems and leaves, tassels began to differentiate, the urgent need for nutrients, chasing good manure in time, not only for the floret flower differentiation to provide the material basis, but also to promote strong stalks, for