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通过节能温室利用稳定性同位素１５~Ｎ示踪方法，对氮素化肥（硫铵）不同施用量与芹菜对其氮素利用率的关系和氮素化肥（硫铵）不同施用量对芹菜产量的影响进行了探讨。结果表明：氮素化肥施用量与氮素利用率呈直线负相关关系，与芹菜产量呈二次曲线关系。都达到极显著水平。在该试验条件和土壤肥力情况下，所得出的氮素肥料效应方程模拟的硫铵最佳施用量约为８５ｋｇ／亩，取得芹菜最高产量。为实际生产确定氮素化肥的施用量，提供参考依据。
Through the energy-saving greenhouse using stable isotope 15 ~ N tracing method, the relationship between different application rates of nitrogenous fertilizer (ammonium sulfate) and the nitrogen utilization rate of celery and nitrogen fertilizer (ammonium sulfate) Impact is discussed. The results showed that there was a linear negative correlation between N application rate and nitrogen utilization rate and a quadratic curve relationship with the yield of celery. Have reached a very significant level. Under the condition of experiment and soil fertility, the optimal application rate of ammonium sulfate was about 85kg / mu and the highest yield of celery was obtained. For the actual production to determine the amount of nitrogen fertilizer application, provide a reference.