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在小麦的生长后期,即从抽穗到成熟前,根系吸收能力逐渐衰退,采用土壤追肥效果较差,且难度很大。而这个时期植株的上部叶片正进行旺盛的光合作用,物质合成与转化过程十分活跃,需要充足的营养物质,才能有利于籽粒灌浆增加粒重,从而提高亩单产。如此时给以叶面喷氮,好似如鱼得水。叶面喷施氮肥具有吸收利用快、肥料用量少、经济效益高等特点。所喷施的肥料很快经由气孔渗入叶片
In the late growth stage of wheat, that is, from heading to maturity, root abscission gradually decline, the use of soil dressing less effective, and very difficult. In this period, the upper leaves of the plants are experiencing strong photosynthesis, the process of material synthesis and transformation is very active, and sufficient nutrients are needed to increase the grain weight of grain filling and improve the yield per mu. This time give foliar nitrogen, it is like a duck’s water. Foliar application of nitrogen fertilizer has the advantages of fast absorption, less fertilizer, high economic efficiency. The fertilizer applied quickly infiltrated the leaves through the pores