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应用１５Ｎ研究不同施氮量对烤烟氮素营养的效应。结果表明，每株烤烟施１０ｇ纯氮比施８ｇ，９ｇ和１１ｇ，吸收硝酸钾中的氮素，分别高２８．９９％，１５．７２％和７．７７％；吸收土壤中氮素分别高２８．４１％，９．５８％和２０．０４％；吸收总氮分别高３１．３２％，１０．８１％和２１．０９％。氮素在烤烟各器官中的分布为叶＞茎＞根。每株烤烟施１０ｇ纯氮，比施８ｇ，９ｇ和１１ｇ的单叶重，分别高７．７７％，５．９０和６．４２％；茎围分别高９．２９％，７．１８％和１０．０６％；每株叶面积分别高１９．７２％，１７．２６％和２２．８９％；总干物重分别增加２６．０５％，１１．５５％和１４．０９％。
Effect of Nitrogen Application on Nitrogen Nutrition of Flue - cured Tobacco with 15N Fertilizer. The results showed that the nitrogen content of 10g nitrogen per plant was 28.99%, 15.72% and 7.77% higher than that of 8g, 9g and 11g, respectively. The nitrogen uptake of soil was high 28.41%, 9.58% and 20.04%, respectively. The total nitrogen uptake was 31.32%, 10.81% and 21.09% respectively. The distribution of nitrogen in organs of flue-cured tobacco was leaf> stem> root. Compared with 8g, 9g and 11g single leaf weight, the yield of 10g pure nitrogen per plant was 7.77%, 5.90 and 6.42%, respectively; the stems were 9.29%, 7.18% and 10.06%. The leaf area per plant was 19.72%, 17.26% and 22.89% higher than the control. The total dry weight increased by 26.05%, 11.55% and 14.09% respectively.