The fructose content increased remarkably in root system, whose increase tendency is same as nicotine content in root system.

根系中果糖含量增加比较显著，且与根系中烟碱含量的增加趋势相同。

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Straw returned to field could increase nicotine content in upper leaves while decrease that in lower and middle leaves.

稻草还田提高产量、中上等烟、均价，从而提高产值和净效益。

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The N, B and Nicotine content in tobacco leaves drop significantly in the order of top leaves, middle leaves and bottom leaves, while K, Fe and Reducing Sugar increase significantly in the same order;

氮、硼、烟碱含量从上部烟叶到下部烟叶显著地依次降低，而钾、铁、还原糖则从上部烟叶到下部烟叶显著地依次升高；

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