Grouping of oriental tobacco of Krumovgrad and Basma (Greek) ecotypes from different regions and micro regions of Haskovo and Djebel tobacco growing area by important chemical indicators
Violeta Nikolova, Radka Bozhinova, Nikolay Nikolov, Yovko Dyulgerski
Abstract: In a study conducted in 2018, the chemical composition (nicotine, reducing sugars, nicotine/reducing sugars ratio, total nitrogen, ash and potassium) of oriental tobacco of two ecotypes from different regions and micro regions of Haskovo and Djebel growing area was investigated. Hierarchical cluster analysis was used to organize the tobacco with similar values of the measured chemical indicators into groups. The samples of Krumovgrad ecotype from the different micro regions of Haskovo and Djebel production area are grouped into three clusters. A separate cluster is formed by the samples from Strandzhevo (Krumovgrad region), Djebel (Djebel region), Patitsa (Kardzhali region), Stambolovo (Haskovo-Harmanli region), Buk (Krumovgrad region) and Krumovgrad (Krumovgrad region), which have a more balanced chemical composition. The main indicators that have the greatest influence on the division of tobaccos of Krumovgrad ecotype from the different microregions into clusters are the nicotine/reducing sugars ratio and the nicotine, reducing sugars, total nitrogen and ash content, united in the first factor, explaining 67.49% of the total variance of the variables. Regarding the chemical composition of tobacco of Basma (Greek) ecotype, from different micro regions of the Haskovo production area, three clusters are also formed. The first of them includes samples from the micro regions Chorbadzhiysko (Momchilgrad region) and Buk (Krumovgrad region), which have a higher nicotine content and a lower reducing sugars/nicotine ratio, and in this case it is an indication of a better balance in smoking properties. A significant proportion (55.32%) of the variance was explained by first factor, which correlates strongly with nicotine, total nitrogen and ash content, as well as the reducing sugars/nicotine ratio. The results obtained can be used in evaluating the quality of tobaccos as a raw material for smoking products, in view of their optimal usability in blending.
Keywords: chemical composition; cluster analysis; grouping; micro regions; oriental tobacco; principal component analysis
Citation: Nikolova, V., Bozhinova, R., Nikolov, N., & Dyulgerski, Y. (2025). Grouping of oriental tobacco of Krumovgrad and Basma (Greek) ecotypes from different regions and micro regions of Haskovo and Djebel tobacco growing area by important chemical indicators. Bulgarian Journal of Soil Science Agrochemisty and Ecology, 59(2), 3-15 (Bg).
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| Date published: 2025-06-25
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