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在甘肃定西半干旱地区采用氮磷二因素重复D-饱和设计进行田间试验。89个试验结果表明,每公斤N增产小麦7.49公斤,豌豆1.54公斤,马铃薯(折主粮)8.83公斤,胡麻3.89公斤,谷子3.25公斤;每公斤P_2O_5增产小麦5.59公斤,豌豆6.06公斤,马铃薯(折主粮)7.32公斤,谷子2.54公斤。六种主要作物9个综合效应方程为本区配方施肥提供了宏观决策依据。结合当地自然条件和经济可能,建议春小麦亩施N4～6公斤,P_2O_52～3公斤;豌豆施N1.5～2公斤,P_2O_52～3公斤;胡麻施N_3～5公斤,P_2O_51.5～2.5公斤;马铃薯施N5～8公斤,P_2O_52～3公斤,谷子施N_2～3公斤,P_2O_52～3公斤;扁豆施N0.5～1公斤,P_2O_51～2公斤。
A field experiment was conducted in the semi-arid area of Dingxi of Gansu by repeated D-saturation design of nitrogen and phosphorus. The results of 89 experiments showed that 7.49 kilograms of wheat, 1.54 kilograms of peas, 8.83 kilograms of potato (staple food), 3.89 kilograms of flax and 3.25 kilograms of millet per kilogram of N were increased; 5.59 kilograms of wheat per kilogram of P 2 O 5, 6.06 kilograms of peas, ) 7.32 kg, millet 2.54 kg. Nine comprehensive effects equations of six major crops provide the basis for macro-decision-making for formula fertilization in this area. According to the local natural conditions and economic feasibility, it is suggested that N 4 ~ 6 kg and P_2O ~ 52 ~ 3 kg of spring wheat are applied in spring wheat; N1.5 ~ 2 kg and P_2O_52 ~ 3 kg are used for peas and N_3 ~ 5 kg and P_2O_51.5 ~ Potato N5 ~ 8 kg, P_2O_52 ~ 3 kg, millet applied N_2 ~ 3 kg, P_2O_52 ~ 3 kg; lentils N0.5 ~ 1 kg, P_2O_51 ~ 2 kg.