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通过田间试验研究了春小麦、冬小麦、春玉米和夏玉米四种作物氮、磷施用量。结果表明，随作物和地区不同.各种作物氮肥最适施用量变异很大，其中，冬小麦氮肥最适施用量为100～155.4kghm2，春小麦为158.7～187.8kghm2，夏玉米为121～228kghm-2。而磷肥最适施用量变化不大，仅春小麦略有差异，为71.9～94.4kghm-2。该研究结果为通过快速营养诊断的方法指导作物追肥提供了依据。
Field experiments were conducted to study the application rates of nitrogen and phosphorus for four crops of spring wheat, winter wheat, spring maize and summer maize. The results showed that the optimum application rates of nitrogen fertilizers vary greatly with crops and regions. Among them, the optimum nitrogen application rates for winter wheat were 100 ~ 155.4kghm2, 158.7 ~ 187.8kghm2 for spring wheat and 121 ~ 228kghm-2 for summer maize . However, the optimum amount of phosphate fertilizer changed little, only spring wheat slightly difference, 71.9 ~ 94.4kghm-2. The results of this study provide the basis for guiding crop top dressing through the method of rapid nutrition diagnosis.