The effects of different air - curing time on physical characteristics and major chemical components of flue -cured upper tobacco leaves were studied by using the flue - cured tobacco Yunyan97 as experimental material. The results showed that the proper air - curing time can reduced the consumption of tobacco dry matter and the contraction of leaf thickness, also can increased the balance water proportion, reduced the content of nicotine in tobacco leaves, and then can improved the quality of tobacco leaves, However, the content of total sugar, reducing sugar, starch and the two sugar difference was reduced in tobacco leaves along with the increase of air - curing time. The technology of first air - curing 36 hours and then flue - curing into the bam was appropriate.%以烤烟品种云烟97为材料,研究了不同晾制时间对烤烟上部烟叶物理特性及主要化学成分的影响.结果表明:适当的晾制时间可减少烟叶干物质的消耗和叶片厚度收缩,并能提高平衡含水率,降低烟叶烟碱含量,进而提高烟叶质量.但随着晾制时间的延长,烟叶总糖、还原糖、淀粉含量下降和两糖差减少.以晾制36h再入烤房烘烤较适当.
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