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本文用１５Ｎ示踪法研究了不同条件下芹菜对氮素的吸收利用与硝酸盐积累的变化。结果表明：芹菜的产量、总氮量、硝酸盐、ＮＯ３含量、硝酸还原酶活性（ＮＲＡ）均随施氨量的增加而增加；施用硝酸铵比施等氨量的硫铵、碳铵，使芹菜产量、总氨量、ＮＯ３－、ＮＲＡ明显增加；在等量氨肥的基础上，增施有机肥使芹菜ＮＯ３－含量增加，增施钾肥使芹菜ＮＯ３－含量下降。采收期芹菜体内累积的硝酸盐主要来自土壤。
In this paper, 15N tracing method was used to study the changes of nitrogen absorption and utilization and nitrate accumulation of celery under different conditions. The results showed that the yield, total nitrogen content, nitrate content, nitrate nitrogen content and nitrate reductase activity (NRA) of celery increased with the increase of ammonia application rate. The ammonium sulfate and ammonium bicarbonate Celery production, total ammonia, NO3-, NRA increased significantly; on the basis of the same amount of ammonia fertilizer, organic fertilizer increased celery NO3- content, increased potassium fertilizer celery NO3- content decreased. The harvested nitrate in the harvested celery comes mainly from the soil.