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中、上等烟叶量和烟叶化学成分是反映烤烟品质的二个主要的方面．打顶时期和单株留叶数是影响烤烟品质的主要农艺因素．现蕾和现蕾前打顶留２０叶，中、上等烟叶率稳定在８０％左右；现蕾和现蕾前打顶，增施氮肥提高中、上等烟叶量．烟叶中烟碱和糖的含量可变性较大，全氮、钾等含量可变性较小．打顶早、留叶数较少时．烟碱和全氮含量较高；留叶较多时增施氮肥，有使烟碱含量增高趋势．含糖量以现蕾打顶处理的较高，与施氮量、密度不呈相关趋势．早打顶、较少留叶可提高烟叶含钾量．本试验条件下．Ｎ（９０）水平现蕾留２０叶打顶为烤烟优质丰产优化组合．
Middle and upper leaf tobacco quality and chemical composition of tobacco leaves reflect the quality of the two main aspects. The top agronomic factors that affect the quality of flue-cured tobacco during the topping period and the number of leave leaves per plant. Before budding and budding topping to leave 20 leaves, medium and superior tobacco leaf rate stabilized at about 80%; budding and budding before the top, increasing nitrogen fertilizer to improve, the amount of superior tobacco. Tobacco leaf nicotine and sugar content variability greater, total nitrogen, potassium and other content less variability. Topping early, when leaves a few less. Nicotine and total nitrogen content is higher; leaves more nitrogen fertilizer application, the nicotine content increased trend. Sugar content in the budding topping treatment is higher, and nitrogen rate, density is not related trends. Early topping, leaves less leaves can increase the potassium content of tobacco. Under the experimental conditions. N (90) level budding leave 20 leaves topping for the flue-cured tobacco high-yield and optimized combination.