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４ａ的冬小麦定位试验证明，旱塬地施用磷肥可提高土壤有效磷含量，促进小麦根系生长，增强对土壤水分及养分的吸收利用，提高水分利用效率。Ｐ２Ｏ５的施用量在７５～３００ｋｇ／ｈｍ２时，小麦的增产率基本随用量的增加而提高，但Ｐ２Ｏ５的增产作用和磷肥利用率却随磷肥用量的增加而降低；磷肥不仅当季增产显著，而且后效明显，第１季施磷后在第４季Ｐ２Ｏ５施用量７５ｋｇ／ｈｍ２的增产率为５３．９％，施用量１５０ｋｇ／ｈｍ２的增产率为６４．３％，施用量３００ｋｇ／ｈｍ２的增产率为１０９．６％，１ｋｇＰ２Ｏ５累计增产小麦依次为３８．７、２５．５、１５．１ｋｇ，分别为第１次效果的２．３６倍、２．３８倍和２．８５倍。同量磷肥分配方式不同时，随着用量增加其肥效均明显降低。
The experiment of locating winter wheat in 4a proved that the application of phosphate fertilizer in the upper plateau can increase the availability of soil phosphorus, promote the growth of wheat roots, enhance the absorption and utilization of soil moisture and nutrients, and improve the water use efficiency. P2O5 application rate of 75 ~ 300kg / hm2, wheat yield increased with the basic amount of increased, but P2O5 increased production and phosphorus use efficiency decreased with the increase of the amount of phosphate fertilizer; phosphorus not only increased significantly in the season, and The obvious after-effect was that the yield of P2O5 75kg / hm2 in the fourth season after the first season was 53.9% and the yield of 150kg / hm2 was 64.3% in the fourth season. The yield of 300kg / hm2 The rate of 109.6%, 1kgP2O5 accumulated wheat yield were 38.7,25.5,15.1kg, respectively, the first effect of 2.36 times, 2.38 times and 2.85 times. With the same amount of phosphate fertilizer is not the same distribution, with the increase in the amount of its fertilizer efficiency were significantly reduced.