高粱产量较高,生育期也较长,是需肥较多的作物,单靠底肥和种肥不能满足幼穗分化和生育后期对养分的需要,需进行科学追肥才能获得高产。一、高粱的需肥规律。高粱苗期生长量小,需肥也少。从拔节开始,根、茎、叶等营养器官生长加快,幼穗、花等生殖器官也开始发育形成,需肥量迅速增加。这个时期追肥,能促进营养体的增大、并为结实器官的良好发育创造有利条件,形成丰产的株型结构。进入抽穗开花期,根、茎、叶基本停 Higher yield of sorghum and longer growing period are the crops that require more fertilizer. Fertilizer alone can not meet the nutrient requirements of young spike differentiation and late growth stage, and scientific top dressing is needed to obtain high yield. First, the law of sorghum need fertilizer. Sorghum seedling growth is small, need less fertilizer. From the beginning of jointing, root, stem, leaf and other vegetative organs grow faster, young ears, flowers and other reproductive organs also began to develop and form, the amount of fertilizer needed to increase rapidly. Top dressing during this period can promote the increase of nutrition body, and create favorable conditions for the sound development of solid organs, and form a plant type structure with high yield. Into the flowering heading, roots, stems, leaves basically stopped