| 【Objective】In order to understand the quality characteristics of tobacco leaves from new tobacco growing
areas in Yunnan and improve the industrial usability of tobacco leaves, the characteristics of main chemical components
in flue-cured tobacco leaves were analyzed.【Method】288 samples of the upper, middle and lower tobacco leaves (B2F,
C3F, X2F) during 2011-2018 were collected from Guangnan, Jingdong and Shuangjiang. The main chemical components in
tobacco leaves were determined and their relationships with cigarette smoking quality were studied.【Result】The chlorine
contents in all the upper, middle and lower tobacco leaves during 2011-2018 collected from Guangnan, Jingdong and
Shuangjiang were relatively low in general. The reducing sugar contents in 41.92% of the middle leaves were higher than
26%, and the nicotine contents in 33.33% of the upper leaves were higher than 3.5%. Higher nicotine contents in the upper
leaves and higher reducing sugar contents in the middle leaves were the main factors influencing the chemical componentcoordination of tobacco leaves from the 3 tobacco planting counties of new tobacco growing areas. The contents of potassium and
chlorine in tobacco leaves during 2011-2018 were relatively stable in the 3 tobacco planting counties. However, the contents
total sugar of reducing sugar in middle and upper leaves showed an increasing trend since 2013, and the biggest increase was
up to 16.02%. The contents of nicotine and total nitrogen showed a downward trend since 2013, and the biggest decrease was
22.07%. The grey correlation analysis indicated that the contents of total nitrogen and reducing sugar were the main chemical
component indicators influencing the total scores of smoking quality.【Conclusion】There were significant differences in the
characteristics of main chemical components in tobacco leaves from 3 tobacco planting areas of Yunnan. It is recommended that
total nitrogen contents of tobacco leaves in Shuangjiang should be appropriately raised and reducing sugar contents be reduced,
while the coordination of chemical components of tobacco leaves in Guangnan can be improved by controlling the contents
nitrogen and nicotine . |
