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15N示踪研究证明，在不同灌溉水平下，在细质砂土上，增施磷肥可以大幅度提高小麦单位面积穗数、穗粒数和产量。并可以促进小麦对N素的吸收，提高肥料N利用率，降低肥料N损失率，促进营养物质的运输和转化，但是小麦的千粒重和含N量则随之下降。增施磷肥的效果大于增施N肥。在中等灌溉水平下，每公顷施纯N204kg，施P2O3180kg，可以实现砂地小麦高产高效的统一。
15N tracer studies have shown that applying phosphate fertilizer can significantly increase the number of spikelets per panicle, grains per spike and yield under different irrigation levels on fine sandy soils. And can promote wheat N absorption, improve fertilizer N utilization, reduce fertilizer N loss rate, and promote the transport and transformation of nutrients, but the grain weight and N content of wheat declined. The effect of increasing phosphate fertilizer is greater than increasing N fertilizer. Under medium irrigation level, applying N204kg per hectare and applying P2O3180kg can realize the high-yield and high-efficiency unification of sandy land wheat.