The effects of different boron supply methods on the content of potassium, nicotine, total sugar and reducing sugar in leaf of flue-cured tobacco were studied under field condition. The results showed that foliage spray of borax could improve the content of total sugar, nicotine in leaf of cured tobacco; spray only on one part of flue-cured tobacco was most helpful for improving potassium content in leaf. Leaf potassium content in treatment of spraying borax on upper leaf were higher than that in other treatments, which showed that foliage spray with borax on upper leaf could promote the absorption, transportation and accumulation of potassium of the upper leaf.%通过大田试验,研究了不同施硼方式对初烤烟叶内在化学成分钾、烟碱、总糖、还原糖含量的影响.结果表明,硼肥的施用能提高烟叶的钾、总糖、烟碱的含量,且只对一个部位施用硼肥对提高该部位烟叶钾含量最为明显;P1处理上部叶钾含量较CK、P0、P2、P3、P4分别提高33.33%、32.35%、5.88%、4.65%和17.65%,说明P1处理可以增加上部叶对钾的吸收、运输及积累.
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