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大田中设置盆栽试验，采用15N示踪法对不同施氮水平烤烟的氮素吸收、肥料氮素的利用和土壤AN值进行研究。试验结果表明：烤烟全生育期吸收的氮素主要来自于土壤可利用氮。随着氮肥用量的增加，烤烟对肥料氮的吸收量增加、对土壤氮的吸收量减少，同时土壤对肥料氮素的固定和氮肥损失量增加。AN值有随氮素用量的增加而逐渐减少的趋势，但以处理4（氮素67．5kg／hm2）最低。肥料中氮索利用率以处理4最高，达到52．3％。
Pot experiments were set up in the field. Nitrogen absorption, fertilizer nitrogen utilization and soil AN values of flue-cured tobacco with different nitrogen levels were studied by 15N tracing method. The results showed that the nitrogen absorbed during the whole growing period of flue-cured tobacco came mainly from available nitrogen in soil. With the increase of nitrogen application, the uptake of fertilizer nitrogen by flue-cured tobacco increased, the amount of nitrogen uptake decreased, while the fixation of nitrogen to fertilizer and the loss of nitrogen fertilizer increased. The AN value tended to decrease with the increase of nitrogen application, but it was the lowest with treatment 4 (nitrogen 67.5kg / hm2). Nitrogen fertilizer fertilizer utilization rate to the highest 4, reaching 52.3%.