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用不同剂量的氮离子注入ＮＣ８９烟草种子，研究其对种子萌发和苗期生长发育的影响。结果表明，离子注入不同剂量对烟草种子萌发和苗期生长有不同的作用。在２０～１２０次范围内可提高种子前期萌发，促进子叶平展和胚根生长，提高幼苗生理活性，增加干物质积累，其中以８０次最佳；对烟苗叶片长、宽、茎粗的增长及干物质积累都有促进作用，与对照比较都达到显著水平，有些达到极显著水平；对烟苗出叶速率、根长、根幅、侧根数的影响，多数处理有促进作用，其中表现较好的处理有１６０次，４０次，８０次。
NC89 tobacco seeds were infused with different doses of nitrogen ions to study their effects on seed germination and seedling growth and development. The results showed that different doses of ion implantation had different effects on tobacco seed germination and seedling growth. In the range of 20 ~ 120 times, seed germination could be enhanced, the cotyledon development and radicle growth could be promoted, the seedling physiological activity and dry matter accumulation increased, of which 80 times were the best; And dry matter accumulation all had significant effects compared with the control, some of which reached the extremely significant level. The effects of most treatments on the leaf emergence rate, root length, root length and lateral root number of tobacco seedlings were promoted, Good deal with 160 times, 40 times, 80 times.