小麦拔节始期正值繁殖器官迅速分化、营养体日益增大的交错时期,也是小麦吸收氮、磷营养高峰的前坡。这种吸收营养物质的势头一直持续到扬花。此时若缺少氮磷,将严重影响蛋白质代谢和细胞分裂、影响光合效率和碳水化合物的积累,致穗粒数明显减少,灌浆强度减弱,植株早衰,产量不高。 The initial stage of wheat jointing is when the multiplying organs rapidly differentiate and the vegetative body is increasingly interlaced. It is also the front slope where wheat absorbs nitrogen and phosphorus nutrition peaks. This momentum of absorption of nutrients continues to flowering. In the absence of nitrogen and phosphorus, will seriously affect protein metabolism and cell division, affecting photosynthetic efficiency and carbohydrate accumulation, resulting in significantly reduced grain number, grain filling intensity weakened, plant premature aging, yield is not high.