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采取种植４年５料作物不同肥水配合田间定位试验田块的土样，研究不同肥水条件对土壤供氮能力的影响。结果表明，施用氮肥能明显地提高土壤０～６０ｃｍ的ＮＯ－３－Ｎ、可矿化氮、有机质和全氮含量；这些测定值与施氮量间达到或接近显著相关。施肥对ＮＨ＋４－Ｎ含量影响不大；灌水对土壤矿质氮、有机质和全氮含量无显著影响，但有利于土壤有机氮的矿化。
Soil samples with 4 fields of 5 different fertilizers and 4 plots of field fertilizer were used to study the effects of different fertilizer and water conditions on soil nitrogen supply. The results showed that application of nitrogen fertilizer could significantly increase the contents of NO-3-N, mineralizable nitrogen, organic matter and total nitrogen in the soil from 0 to 60 cm. These measured values reached or approached a significant correlation with the nitrogen application rate. Fertilization has little effect on NH + 4-N content. Irrigation has no significant effect on mineral N, organic matter and total N, but is beneficial to the mineralization of soil organic N.