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本研究结果表明，随氮素用量的增加，烤烟地上部的生长速度、茎粗、叶面积指数均增加，但各个时期变化程度不尽相同；除团棵期外，其余各期均随氮用量增加，硝酸还原酶活力有提高趋势，特别在旺长期，这一趋势更明显，因此可通过测定硝酸还原酶活力探知氮素水平；随氮素用量增加，叶绿素含量均增加，但到生长中后期以施６０ｋｇ／ｈｍ２纯氮处理叶绿素含量适中，能正常落黄成熟；施６０ｋｇ／ｈｍ２纯氮处理几种化学成分比值优于其它处理，内在品质颇佳；施６０ｋｇ／ｈｍ２纯氮素处理产量适中，产值最高，９０ｋｇ／ｈｍ２纯氮处理次之。
The results showed that the growth rate, stem diameter and leaf area index of above-ground parts of flue-cured tobacco increased with the increase of the amount of nitrogen, but the changes varied with time. The nitrate reductase activity tends to increase. Especially in the long-term, this trend is more obvious. Therefore, the nitrogen level can be detected by measuring the nitrate reductase activity. With the increase of the nitrogen dosage, the chlorophyll content increases, but in the late growth period The treatment with 60 kg / hm2 of pure nitrogen had moderate chlorophyll content, and could fall off yellow normally. The ratio of several chemical components of 60 kg / hm2 of pure nitrogen was better than other treatments, and the intrinsic quality was good. , The highest output value, followed by 90kg / hm2 pure nitrogen treatment.