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Tobacco curing is a complex combination of parallel physical and biochemical processes in green tobacco leaves. The aim of this study is to find the effect of the yellowing stage in the curing process on the change of basic chemical values of nicotine and sugars in Bulgarian varieties and newly selected lines oriental tobacco in the Plovdiv and Macedonia tobacco regions. The study is carried out in Tobacco and Tobacco Products Institute, Markovo. Line 27, Line 94, Line 275, Harmanli 134, Kozarsko 339, Plovdiv 7, Plovdiv 187, Plovdiv 380, Dupnitsa 160 and Dupnitsa 733 were investigated, harvest 2016. Еach tobacco sample was divided into two groups - yellowed for 48 hours and dried without yellowing. Reducing the nicotine content in tobacco during sun-curing is proven for all studied varieties with exception of Plovdiv 7. The increasing of quantity of soluble sugars in tobacco is high for all studied varieties from both tobacco regions.

The Effects of During Sun-Cured Period on the Some Chemical Composition Changes of Oriental Tobacco