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１９９２～１９９６年在陕西渭北旱塬合阳县甘井乡进行了冬小麦产量的土壤养分限制因子与高产高效施肥指标试验。结果表明，在渭北旱塬，氮、磷是冬小麦产量的限制因子，钾、铁、锰、镁、硼为非限制因子。限制因子对冬小麦产量的效应Ｐ２Ｏ５＞Ｎ，效益最佳平台区施肥量歉水年Ｎ９０．０３～１０４．１７ｋｇ／ｈｍ２，Ｐ２Ｏ５８３．７４～９１．２９ｋｇ／ｈｍ２；平水年Ｎ９７．３０～１３２．３１ｋｇ／ｈｍ２，Ｐ２Ｏ５８９．６５～１０６．８８ｋｇ／ｈｍ２．
From 1992 to 1996, the limiting factors of soil nutrients and high yield and high fertility index of winter wheat were tested in Ganjing Township, Heyang County, Weibei Arid Highland, Shaanxi Province. The results showed that in Weibei arid highland, nitrogen and phosphorus were the limiting factors of winter wheat yield, while potassium, iron, manganese, magnesium and boron were the unrestricted factors. The effect of limiting factors on the yield of winter wheat P2O5> N, the best benefit of the platform area fertility apology water years N90.03 ~ 104.17kg / hm2, P2O583.74 ~ 91.29kg / hm2; flat water N97.30 ~ 132.31kg /hm2,P2O589.65 ~ 106.88kg/hm2.