Field experiments with tobacco cultivar Yuyan No.12 were carried out to study effects of different nitrogen fertilizer rates on chemical components and 7 harmful components delivery in mainstream smoke.Results showed that different nitrogen fertilizer rates affected content of routine chemical compositions,and had influence on delivery of harmful components in mainstream smoke.Contents of protein,nicotine and total nitrogen increased,while total sugar and reducing sugar decreased with the increase of nitrogen fertilizer rate,while its effect on effect on potassium and chlorine content were not obvious.Nitrogen fertilizer rate had different effects on 7 harmful components in mainstream smoke.Crotonaldehyde decreased while ammonia and N-nitrosamines increased along with the increase of nitrogen fertilizer rate.When treated with 55 kg/hm2 nitrogen fertilizer,conventional chemical composition was coordinate,hazardous index of seven harmful components in mainstream smoke was lowest.%以烤烟豫烟12号为材料,通过田间试验研究不同施氮量对烤烟化学成分和主流烟气中7种有害成分的影响.结果表明,施氮量不同不仅影响烟叶常规化学成分的含量,而且对主流烟气中有害成分的释放量产生了影响;随施氮量增加,烟叶中蛋白质、烟碱和总氮的含量增加,总糖和还原糖含量减少,钾和氯含量影响不明显;主流烟气中7种有害成分随施氮量的增加变化趋势不同,随施氮量增加,巴豆醛的释放量减少,氨和NNK的释放量增加;施氮量在55 kg/hm2时,烟叶常规化学成分协调,主流烟气中7种有害成分的危害性指数最低,烟草质量安全性较高.
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