| On the basis of nine tobacco cultivars in Mudanjiang ecological conditions. The flue-cured tobacco genotypes leaves of the appearance quality, physical properties, chemical components, neutral aroma constituent, sensory quality and economic characters of different flue-cured tobacco were analyzed; Similarity analysis of different flue-cured tobacco genotypes leaves from Mudanjiang and high-quality tobacco leaves of Zimbabwei, And the establishment of a quality evaluation model of comprehensive evaluation of different flue-cured tobacco. The results was followed:1.The appearance quality of different flue-cured tobacco genotypes were different. Y8303 and CF202 of good appearance quality of flue-cured tobacco , color orange, glossy leaves strong ,good oil and more loose structure; Wendell, Jiyan 9 and 9625 appearance quality tobacco were relatively poor.2. Physical characteristics of different flue-cured tobacco genotypes were analyzed, the results show that the lower leaves of Longjiang 911, NC89, 9625 and Jiyan 9 better physical characteristics, Wendell, LJ237 and CF202 relatively poor; middle leaves Longjiang 911, LJ237, and 9625 better physical characteristics, 7581 less the physical characteristics; upper leaves, Longjiang 911, Jiyan 9 and 9625 better physical characteristics, NC89 and 7581 poor physical characteristics.Physical characteristics of cluster analysis showed that, CF202 and 9625 of the physical characteristics were closer. this type of tobacco leaves thin leaf, leaf specific weight light, resistance to tension and balance the moisture content was low; Longjiang 911, 7581, Wendell and Jiyan 9 of the physical characteristics were more close, the coordination of this type of leaf length to width ratio of leaf material, leaf specific weight heavy, balance the moisture content was higher. NC89, LJ237 and Y8303 physical characteristics were closer, this type of tobacco filling power was high, stems ratio were higher.3. Tchemical composition of different flue-cured tobacco genotypes were analyzed, the results show that the lower leaves, NC89, 7581 and 9625 of the chemical composition was more coordination, Longjiang 911 and Jiyan 9 less; middle leaves, LJ237, 9625, Y8303, and NC89 of the chemical composition more compatible, Jiyan 9 worst; upper leaves, Longjiang 911 and 7581 of the chemical composition of the more coordination, NC89, Jiyan 9, 9625 and Wendell lower scores. different parts compared, the upper leaves >middle leaves >the lower leaves.Chemical composition of the cluster analysis showed that, LJ237 and 7581 were closer to the chemical composition, this type of leaf reducing sugar, potassium and chlorine content suitable, chemical components of most coordination; CF202, NC89, Longjiang 911 and Y8303 of the chemical composition were close, this type of total nitrogen and chlorine content were higher, low starch content; Jiyan 9, 9625 and Wendell was closer to the chemical composition, these relatively poor chemical composition of tobacco leaves.4.Contents of aroma constituents of different flue-cured tobacco genotypes were analyzed,the results showed that there were significant difference among different tobacco genotypes,and there were difference among different parts of the same tobacco genotypes. Comprehensive analysis, contents of aroma constituents of CF202, NC89, Y8303, and Wendell were good in Mudanjiang ecological conditions, other tobacco species were poor.Aroma constituents of different flue-cured tobacco genotypes of cluster analysis showed that aroma constituents of Wendell, Y8303, Longjiang 911, NC89 and CF202 were close, this type of leaf carotenoids, Browning reaction, neophytadiene and total content of aromatic constituents were high; Aroma constituents of Jiyan 9, 9625, and LJ237 were close, the content of aroma constituents of cembratriendid of this type tobacco was higher.5. Economic characteristics of different flue-cured tobacco was analyzed. The results show that the higher yield of 9625 and 7581, NC89 the lowest yield. The highest average price in 9625, Longjiang 911, NC89 lowest average price. The proportion of superior tobacco on the Jiyan9 was highest, Longjiang 911 and LJ237 lowest .6.Sensory quality of different flue-cured tobacco was analyzed.The results showed that the lower leaves, overall sensory quality of 9625,7581,Y8303 and CF202 was good,Jiyan 9 and NC89 relatively poor;middle leaves, overall sensory quality of Wendell,9625 and 7581 was good, Longjiang 911, Jiyan 9 and LJ237 relatively poor;upper leaves, overall sensory quality of Y8303, Longjiang 911 and 9625 was good, NC89 and Jiyan 9 relatively poor.Sensory quality of cluster analysis showed that sensory quality of 9625,7581, and Y8303 was close, and the relatively good smoking quality; Wendell and CF202 in smoking quality was closer, and smoking quality second; sensory quality of Longjiang 911, NC89, Jiyan 9 and LJ237 was close, and the relatively poor quality of sensory smoking.7. The similarity analysis of chemical components between flue-cured tobacco leaves and Zimbabwei leaves, the results showed that lower leaves, NC89, LJ237, and 9625 with the lower leaves of flue-cured tobacco in Zimbabwe was most similar to the chemical composition; middle leaf, LJ237 and Zimbabwe chemical composition of flue-cured tobacco was most similar; upper leaves, Longjiang 911, NC89 and 7581 and the Zimbabwe Tobacco chemistry components was most similar.The similarity analysis of aroma constituents between flue-cured tobacco leaves and Zimbabwei leaves, the results showed that the upper leaves, CF202 and NC89 with Zimbabwe was most similar; middle leaves, NC89, Wendell, and Y8303 with Zimbabwe was most similar.8.Using quantitative methods the quality of flue-cured tobacco was evaluated. The results showed that the integrated quality index of nine flue-cured tobacco genotypes from high to low was Y8303,9625,CF202, 7581, LJ237, Longjiang 911, Wendell, NC89, Jiyan 9.Comprehensive quality of Y8303, CF202, NC89, Longjiang 911 and LJ237 was relatively close, the appearance quality of this type was better, chemical components of better coordination; 9625 alone as a class, this type of physical characteristics and sensory quality was good, comprehensive quality high; Wendell and 7581 are closer to the comprehensive quality. This type of leaf tobacco each quality target index was in the intermediate quantity in 4 types; Jiyan 9 alone as a class, the comprehensive quality of this type was worst.
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