采用二次饱和 D—最优设计,试验研究了施氮量与留叶数对烤烟产量、效益及烟叶化学成分含量的影响。结果表明:亩施氮量3.50～5.73kg、单株留叶数16～18片,烟叶亩产量可达150～200kg,亩产值400元以上,烟碱含量2.5%～3.0%,还原糖含量15%～17%。主因素效应以施氮量对产量、产值、还原糖的影响最大,留叶数次之,二因素对烟碱的主效应大小相近。 Using the second-order saturation D-optimal design, the effects of nitrogen application rate and leaf number on the yield and benefit of flue-cured tobacco and the chemical composition of tobacco leaves were studied. The results showed that the amount of nitrogen per mu was 3.50 ~ 5.73kg, the number of leave per plant was 16 ~ 18, the yield per mu of tobacco reached 150 ~ 200kg, the yield per mu was 400 yuan, the nicotine content was 2.5% ~ 3.0%, the content of reducing sugar % ~ 17%. The main effect of nitrogen fertilizer on the yield, output value, the largest impact on reducing sugar, leaves several times, two factors on the nicotine’s main effects are similar in size.