Abstract:

The chemical constituents of different varieties of flue-cured tobacco in Weifang were detected by near infrared spectroscopy, the differences of chemical constituents were analyzed, and evaluated by principal component analysis and cluster analysis. The results showed that except for Zhongchuan 208, the contents of total sugar, reducing sugar and potassium-chloride ratio of other varieties were in the appropriate range. The nicotine content of Yunyan 301 was suitable, and the nicotine content of other varieties was not in the suitable range. The contents of total nitrogen, potassium, chlorine and protein of all varieties were suitable, the sugar-nicotine ratio were higher than 15.00, and the starch content of Zhongyan 101 and NC55 was suitable. The comprehensive scores of the principal components from high to low were Zhongchuan 208, Zhongyan 100, NC55, Zhongyan Texiang 301, Zhongyan 101 and Yunyan 301. After clustering, varieties were divided into three categories, the first category was Zhongchuan 208, NC55 and Zhongyan 100, which had the characteristics of high sugar, high chlorine, low nicotine, high sugar-nicotine ratio and low potassium-chlorine ratio, the second category was Zhongyan Texiang 301 and Zhongyan 101, and the third category was Yunyan 301, which had the characteristics of low sugar, low chlorine, high nicotine, low sugar-nicotine ratio and high potassium-chlorine ratio.

Key words: Weifang tobacco area, varieties, chemical composition, evaluation, flue-cured tobacco