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在冀北高原张北县的草甸栗钙土上，采用15N质量平衡法和微气象学技术，对春小麦中氮肥的去向，以及氨挥发进行了田间原位观测。试验中的氮肥用量为N4.83kg／亩，1／3作基肥、2／3作追肥。基肥随播种施入，追肥于拔节期撤施，随即灌水。结果表明，小麦回收、土壤残留和损失的肥料氮各占施入氮量的37.8％-48.3％、33．80—40．4％和14．30-25．4％。其中，尿素作基肥与作追肥的处理之间，其氮素的去向无明显的差异，但是，小麦对追施的碳铵的回收率比尿素的低约10％，而损失则高7.5％。作追肥施用的尿素和碳铁的氨挥发分别只占施入氮量的1％和5％。此外，试验结果还表明，小麦吸收的氮素中来自肥料氮的比例不足1／3，而以土壤来源氮为主。
On the meadow chestnut soil in Zhangbei County of North Hebei Plateau, 15N mass balance and micrometeorology techniques were used to observe the fate of nitrogen and the ammonia volatilization in spring wheat. The amount of nitrogen fertilizer used in the experiment was N4.83kg / mu, 1/3 for basal fertilizer and 2/3 for topdressing. Base fertilizer applied with sowing, topdressing the top dressing withdrawal, then irrigation. The results showed that the amount of nitrogen fertilizer, wheat residue, soil residue and loss of fertilizer accounted for 37.8% -48.3%, 33.80-40.4% and 14.30-25.4% of the nitrogen content. Among them, there was no obvious difference in the direction of nitrogen between basal fertilizer and top dressing. However, the recoveries of topdressing ammonium bicarbonate were about 10% lower than that of urea while the loss was 7.5% higher. Ammonia volatilization of urea and carbon and iron for top dressing only accounted for 1% and 5% of nitrogen applied. In addition, the test results also show that wheat nitrogen from the fertilizer nitrogen from the proportion of less than 1/3, while the soil-based nitrogen.