Abstract:

The method of principal component analysis was used to comprehensively evaluate the quality of flue-cured tobacco. It provided scientific basis for accurately evaluating the quality characteristics of upper flue-cured tobacco leaves in Shandong Province. A total of 105 B2F grade tobacco samples from 10 main tobacco planting counties in Shandong Province in 2020 and 2021 were selected as materials. Standardization and principal component analysis methods were applied to classify physical and chemical composition indicators, and the quality of upper flue-cured tobacco leaves in tobacco planting counties. There were significant positive correlations between single leaf weight and leaf length and width, leaf density and leaf thickness, total sugar and reducing sugar, nicotine and nitrogen, and the principal component eigenvectors were consistent, which could be classified as one type of indicator. According to the evaluation results of physical properties, the upper flue-cured tobacco leaves in Shandong production area could be divided into three categories. Based on the evaluation results of chemical composition, the upper flue-cured tobacco leaves in Shandong production area could be divided into two categories. Based on the comprehensive evaluation results of physical properties and chemical composition, the upper tobacco in Shandong production area could be divided into four categories. Yiyuan, Wulian, Linqu were in a class, Lanling, Yishui, Juxian, Laiwu were in a class, Zichuan and Huangdao were in a class, Zhucheng alone was a class.

Key words: Shandong tobacco planting area, quality evaluation of tobacco leaves, upper flue-cured tobacco leaves, principal component analysis, physical characteristics, chemical composition