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根据肥料效应函数法，采用三因素天水平回归设计的配方施肥研究表明，在灰棕紫泥土上每生产1000Kg豇豆需吸收N5．32Kg，P2O51．44Kg，K2O3．35Kg。据差减法计算，豇豆吸收N的46．8％、P2O5的21．7％、K2O的28％来自于土壤，其余养分则由施肥及根瘤菌作用补充。在配肥模式中，灰棕紫泥土壤氮∶磷∶钾施肥比例为1∶2∶2，黄色石灰土施肥比例为1∶2．5∶2，而单施氨、磷、钾肥，每公顷分别达到N45kg，P2O567．5kg，K2O60Kg后，豇豆产量明显下降。表明氮、磷、钾的用量都应控制在一定范围内。
According to the fertilizer effect function method, the formula fertilization study using the three-factor day horizontal regression design showed that N5.32Kg, P2O51.44Kg and K2O3.35Kg should be absorbed by every 1000kg of cowpea grown in gray-purple soil. According to the subtractive subtraction method, cowpea absorbs 46.8% of N, 21.7% of P2O5 and 28% of K2O from the soil, while the rest nutrients are supplemented by fertilization and rhizobia. In the fertilization mode, the ratios of N: P: K fertilization in the soil were up to 1: 2: 2 in the gray-purple soil, while that in the yellow limestone soil was 1: 2.5: 2, while the ammonia-, Respectively, reached N45kg, P2O567.5kg, K2O60Kg, cowpea production decreased significantly. That the amount of nitrogen, phosphorus and potassium should be controlled within a certain range.