沙河市地处河北省南部,夏玉米是其种植的主要农作物,常年播种面积达23万亩。夏玉米是需肥较多的作物,只有掌握了其营养特性和需肥规律,正确合理施肥,才能获得玉米高产。一、夏玉米营养特性夏玉米属于短日照喜温作物,其全生育期可分为苗期、穗期、花粒期三个主要时期:拔节前为苗期,是扎根长叶为主的营养生长阶段;拔节至抽穗为穗期,是营养生长旺盛,雄雌穗分化形成,营养生长和生殖生长并进阶段,是决定玉米果穗大小的重要时期;抽雄至成熟为花粒期,是以籽粒形成为中心的生殖生长阶段。夏玉米与春玉米 Shahe City is located in the southern part of Hebei Province, summer maize is the main crop of its planting, planting area of ​​230,000 perennial. Summer maize is a fertilizer that requires more fertilizer. Only when the nutrient characteristics and the law of fertilization are mastered, proper and appropriate fertilization can be obtained to obtain high yield of corn. First, the nutritional characteristics of summer maize Summer maize belongs to the short-day hi-temperature crops, the whole growth period can be divided into three main periods of seedling, spike, pollen stage: before jointing is the seedling stage, is rooted long leaves Vegetative growth stage; jointing to heading for the panicle, vegetative growth is vigorous, male and female spike differentiation formation, vegetative and reproductive growth and advanced stage, is to determine the size of maize ear, an important period; tasseled to maturity for the flowering period, the grain Formed as a center of reproductive growth phase. Summer corn and spring corn