| Autor: |
PENG Yufu, LI Junying, GUO Weimin, JIA Shiwei, ZHANG Yaoxu, ZHOU Hanping, XU Qiang |
| Zdroj: |
Tobacco Science & Technology; 2024, Vol. 57 Issue 9, p48-58, 11p |
| Abstrakt: |
To clarify the relationships between physicochemical properties of freshly harvested tobacco leaves and the quality of flue-cured tobacco leaves, the harvest maturity test coupled with different nutrient conditions was conducted in the field. The differences in the physicochemical properties of fresh leaves and their correlations with appearance and major chemical compositions of the cured leaves were analyzed. Regression prediction models of chemical compositions in the flue-cured leaves were established based on physicochemical indexes of the fresh leaves. The results showed that: 1) The physicochemical properties of the fresh leaves with different maturity degrees were different, and the rules of middle and upper leaves were basically the same. The nitrogen and moisture contents (mass fractions) in unripe fresh leaves were relatively higher, while their starch contents were lower. There was little difference in the physicochemical properties between mature and ripe fresh leaves. 2) Within the scope of this study, the curing loss rate of the fresh leaves increased and the oiliness of the flue-cured leaves decreased with the increase of total nitrogen and nicotine contents in the fresh leaves, while the curing loss rate of the fresh leaves decreased and the oiliness of the flue-cured leaves increased with the increase of starch content in the fresh leaves. 3) The coefficients of determination of the established regression prediction model based on total nitrogen content in the fresh leaves for reducing sugar and total nitrogen contents in the flue-cured leaves were 0.629 and 0.579, respectively; and that of the regression prediction model based on starch content in the fresh leaves for reducing sugar content in the flue-cured leaves was 0.632. 4) The total nitrogen content in the fresh leaves could be used to accurately predict the total nitrogen content in the flue-cured leaves with the average relative error less than 7%. Based on the starch and total nitrogen contents in the fresh leaves, the prediction model for reducing sugar content and sugar-nicotine ratio of the flue-cured leaves could be established with the average relative errors less than 14% and 18%, respectively. The physicochemical properties of the fresh tobacco leaves were closely related to the quality of the flue-cured tobacco leaves, the total nitrogen and starch contents in the fresh leaves can be used to predict the total nitrogen and reducing sugar contents and sugar-nicotine ratio of the flue-cured leaves. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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