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采用１５Ｎ示踪方法，研究了麦田土壤水分条件对肥料氮（１５Ｎ）的吸收、淋溶和损失的影响规律。结果表明，土壤供水条件在一定范围内（１８０～３６０ｍｍ有效水），氮素的损失与施肥量成正比；其氮素利用率与施肥量成反比关系。低肥处理的氮素利用率均高于高肥处理水平的氮素利用率。其中Ｆ２处理氮素利用率变幅为１７９～３０５％。
The effect of soil moisture on the absorption, leaching and loss of fertilizer nitrogen (15N) was studied by 15N tracing method. The results showed that the soil water supply was within a certain range (180 ~ 360mm effective water), and the nitrogen loss was proportional to the amount of fertilizer applied. The nitrogen use efficiency was inversely proportional to the amount of fertilizer application. The nitrogen use efficiency of low fertilizer treatment was higher than that of high fertilizer treatment. Among them, the nitrogen utilization rate of F2 treatment ranged from 179 to 305%.