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用差减法在保证Ｎ 素供应的条件下，研究大田生产中不同养分元素供应与否对烟株生长及烟叶产质量的影响。试验结果表明：－ Ｋ 处理使烟叶中的单叶重比ＦＡ 明显降低；－ Ｍｇ 、－ Ｋ 处理使烟株旺长期的单株叶面积明显减少；－ Ｐ 处理的抗病性较差，３ 种病害的病指均为最高；－ Ｋ、－ Ｚｎ 、－ Ｓ 处理对烟株的抗病性均有不良影响；－ Ｋ 处理的产量较低；－ Ｂ、－ Ｋ 对上等烟的比例影响较大，比ＦＡ 处理的下降９ ．２ ％ ～９ ．７ ％ ；－ Ｂ、－ Ｍｇ 处理的总糖、烟碱含量较低而－ Ｂ 的总Ｎ 含量较高；－ Ｐ、－ Ｓ、－ Ｋ 处理的总糖含量较高，总Ｎ 量较低；－ Ｐ、－ Ｂ 处理对烟叶的香气和吸味有较大影响。
Using the subtractive method to ensure the availability of N supplies, we studied the effects of different nutrient supply in the field on the growth of tobacco and the quality of tobacco. The results showed that: - K treatment reduced the single leaf weight more than FA in tobacco leaves; - Mg and - K treatments significantly reduced the leaf area per plant in tobacco plants; - The resistance of P treatment was poor, The pathogeny index of the disease was the highest. - K, - Zn and - S treatments had adverse effects on the disease resistance of tobacco plants; - The yield of K treatment was lower; Large, a decrease of 9% over the FA treatment. 2% ~ 9. 7%; - The total sugar, nicotine content of B and - Mg treatment was low while - the total N content of B was higher; - The total sugar content of P, - S, - K treatment was higher and the total N content was lower; - P, - B treatment on tobacco aroma and smoke absorption have a greater impact.