试验以云烟87品种为材料,按上、中、下三个部位分别设计了4个不同的烟叶采收标准,研究成熟度对烟叶外观质量及内在化学成分含量的影响,以期为各部位烟叶的合理采收时间提供参考。结果表明:上部烟叶以顶1叶为判断依据,当叶片微显黄色、茎叶角度小于直角、叶片稍弯曲时可以采收;中部烟叶则以叶片黄多绿少、叶面有黄泡、主脉变白、部分支脉变白、茸毛脱落、叶下垂和采收时发脆为标准进行采收;下部烟叶当叶色稍褪、茸毛部分脱落、叶脉呈绿色时进行采收。 In the experiment, Yunyan 87 was used as material, and four different tobacco harvesting standards were designed according to the three parts of upper, middle and lower parts to study the effect of maturity on the appearance quality and internal chemical composition of tobacco leaves. Reasonable collection time for reference. The results showed that the upper leaves were judged by the top 1 leaf. When the leaves were slightly yellowish and the stems and leaves angle was less than the right angle, the leaves could be harvested when they were slightly bent. The middle leaves had yellow and green leaves less, The veins became whitish, part of the veins became white, the vellus hair fell off, the leaves sagged and harvested as a standard for harvesting. The lower part of the leaf had faded slightly when the leaf color faded away, and the veins became green when the veins were green.