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采用盆载和田间小区试验研究了小麦和玉米叶面10g／L尿素、10g／LKH2PO4和5．4g／LKCl及其配合施用的一些生理效应。叶面施用尿素，尤其是N，P和K的配合施用可显著延缓两种作物在拔节后其根系活力的下降。叶面追肥增强了两种作物功能叶的生理活性，在N，K或P＋K三者之间，尿素的效果较佳。三者的配合施用是最大限度延长叶片寿命的措施。作物后期喷尿素＋KH2PO4能显著增加小麦和玉米的籽粒产量。叶面施用N、P、K肥不仅提高了作物体内N，P，K的含量，而且改变了它们在不同部位的分配，促进N素向籽粒运转，10g／L尿素＋10g／LKH2PO4处理可分别提高小麦和玉米籽粒的蛋白质含量的绝对值22g／kg和4．9g／kg。
Pot experiments and field plot experiments were conducted to study the physiological effects of 10g / L urea, 10g / L KH2PO4 and 5.4g / L KCl on wheat and maize foliar application. The combined application of foliar application of urea, especially N, P and K, significantly delayed the decline of root activity of both crops after jointing. Leaf top dressing increased the physiological activity of two crop functional leaves, and the effect of urea was better between N, K or P + K. The three with the application is to maximize the life of the blade measures. Post crop spray urea + KH2PO4 can significantly increase the grain yield of wheat and maize. Foliar application of N, P and K fertilizers not only increased N, P and K contents in crops, but also changed their distribution in different parts and promoted the N movement to grain. The treatment with 10g / L urea + 10g / L KH2PO4 increased The absolute protein content of wheat and corn kernels was 22 g / kg and 4.9 g / kg.