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在陇东主要土壤黑垆土、黄绵土和石灰性新积土上设置１０４点（次）磷肥肥效试验。结果表明，土壤有机质、有效氮，有效磷对作物基础产量贡献最大。土壤有效磷是决定磷肥增产的主导因素。高肥力土壤基础供磷能力强，小麦对土壤磷素依存率高，磷肥利用率仅８．７％；低肥力土壤则相反，磷肥利用率可达１１．２％。土壤有效磷含量与相对产量呈极显著负相关（ｒ＝－０．８４７），据此确定本区土壤有效磷丰缺指标：＜６ｍｇ／ｋｇ为极缺；６～１１ｍｇ／ｋｇ为缺；１１～１５ｍｇ／ｋｇ为稍缺；＞１５ｍｇ／ｋｇ为丰富。
In the eastern Longdong major soil black loam soil, loessial soil and calcareous new fill soil to set 104 points (times) fertilizer effect test. The results showed that soil organic matter, available nitrogen and available phosphorus contributed the most to crop basic yield. Soil available phosphorus is the dominant factor that determines the yield of phosphate fertilizer. High fertility of soil basal phosphorus supply ability, wheat high dependence on soil phosphorus, phosphorus utilization rate of only 8.7%; low-fertility of the soil on the contrary, phosphorus utilization rate of up to 11.2%. There was a significant negative correlation between soil available phosphorus and relative yield (r = -0.847), so the index of abundance and deficiency of available phosphorus in soil was determined: <6mg / kg was extremely deficient; 6 ~ 11mg / kg was absent; 11 ~ 15mg / kg is a bit short;> 15mg / kg is rich.