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施肥是对烟株生长及烟叶品质影响较大的一个栽培因子，随施肥量的增加，烟株的株型发生变化由塔型→筒型→倒塔型；烟株养分积累不平衡，总糖含量降低，总氮和烟碱含量增加。试验表明，优质烤烟在云南烟区的适宜施肥量为纯氮８ ～１０ｋｇ／ 亩（ Ｋ３２６ 品种） ，株型为筒型，株高９０ ～１００ｃｍ ，叶片长度为６０ ～８０ｃｍ ，田间最大叶面积系数为３ ．０ ～３ ．５ ，最大采烤叶面积系数为３ ．５ 左右，大田生长期为１１５ ～１２０ 天，田间叶面积系数的变化符合Ｓ 型曲线方程。
Fertilization is a cultivation factor that has a great effect on tobacco plant growth and tobacco quality. With the increase of fertilizer application, plant type changes from tower type to tube type to inverted tower type. The accumulation of tobacco plant nutrients is unbalanced, The content decreased, total nitrogen and nicotine content increased. The experiment showed that the suitable fertilization amount of high quality flue-cured tobacco in Yunnan tobacco area was 8 ~ 10kg / mu (K326) of pure nitrogen, the plant type was tube type, plant height 90 ~ 100cm, leaf length 60 ~ 80cm, 3 0 ~ 3. 5, the maximum roasted leaf area coefficient of 3. 5 or so, field growth period of 115 to 120 days, field leaf area coefficient changes in line with the S-curve equation.