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采用回归设计，经１９９２～１９９４年三年田间试验，探讨了宁夏干旱区井灌春小麦的平衡施肥，提出了不同肥力水平土壤的氮磷肥最佳用量及比例，初步确定了平衡施肥的有关参数。
By regression design, the balanced fertilization of well-spring wheat in Ningxia arid area was discussed in the field experiment of 1992 to 1994 three years. The optimum dosage and proportion of nitrogen and phosphorus fertilizer in different soil fertility levels were put forward, and the relevant parameters of balanced fertilization were preliminarily determined.