The Research On Regional Characteristic Of Physical Characteristics Of Flue-Cured Tobacco From Xiangxi

Xiangxi Tujia and Miao Autonomous Prefecture locates in the Wuling mountainous area of the east side of the Yunnan-Guizhou Plateau and northwest of Hunan Province, which is in subtropical humid monsoon climate zone. It is an important producing area of high-quality flue-cured tobacco in Hunan Province. Physical properties of tobacco leaf is an important index of tobacco leaf quality and machining performance, has important influence to the quality and cigarette product style in the process of manufacturing,cost and other economic indicators. In this study, we analyzed physical properties of leaf length, leaf width, length with leaf width proportion,weight per leaf, stem ratio, thickness of leaf,weight per unit leaf area and balance water ratio of three main flue-cured tobacco ranks produced in 7 counties of Xiangxi. We also compared respective the differences of physical properties of flue-cured tobacco characteristics at different positions, different cultivars, different soil types, different counties and towns. Moreover, we compared difference and similarity of evaluation indexes of physical properties of flue-cured tobacco in Xiangxi with other main producing-areas of flue-cured tobacco from other regions. The research results are as following:(1)The general physics properties of flue-cured tobacco is thin thickness of leaf, structure of osteoporosis, strong hygroscopicity and large stem ratio. So, filling is wonderful and strong hygroscopicity of flue-cured tobacco, conducive to flavored charging.(2)The leaf length of flue-cured tobacco leaves shows significant difference among different positions, but the difference among cultivars, soil types, and altitudes were no-significant. In B2F grade,the longest of leaf length is established at Baojing, but the shortest at Huayuan; in C3F grade, the longest one is found at Fenghuang, the shortest at Baojing; in X2F grade, the longest leaf length is at Baojing, the shortest at Yongshun.(3)The leaf width of flue-cured tobacco leaves shows significant difference among different positions, but the difference among cultivars, soil types and altitudes were no-significant. In B2F grade,the most wide of leaf width is from Baojing, the narrowest one from Yongshun;in C3F grade, the most wide of leaves is from Baojing, but of which at Luxi is narrowest;in X2F grade, themost wide is showed at Guzhang county, the narrowest at Baojing county.(4)The length with leaf width proportion of flue-cured tobacco leaves shows significant difference among different positions, but the difference among cultivars, soil types and altitudes were no-significant. The biggest of length with leaf width proportion of B2Fgrade is from Baojing, the minimum one from Yongshun. In C3F grade, the leaves produced at Baojing county shows the biggest, but of which atHuayuan county is minimum. In X2Fgrade, the biggest is showed at Guzhang, the minimum at Baojing county.(5)The weight per leaf of flue-cured tobacco leaves shows significant difference among different positions, but the difference among cultivars, soil types and altitudes were no-significant. The biggest of weight per leaf of B2F rank is from Fenghuang county, the minimum one from Baojing county. In C3F grade, the leaves produced at Longshan shows the biggest, but of which at Baojing is minimum. In X2Fgrade, the biggest is showed at Baojing, the minimum at Huayuan. The spatial distribution has increasing trend from southeast to northwest.(6) The positions and soil types significant affect the stem ratio of flue-cured tobacco leaves, while cultivars and altitudes do not. Of B2F rank,the highest of the stem ratio is established at Baojing, but the lowest at Yongshun; in C3F grade, the highest one is found at Fenghuang, the lowest at Huayuan. In X2Fgrade, the highest the stem ratio is at Fenghuang, the shortest at Huayuan county. The spatial distribution has descending trend from southeast to northwest.(7) The positions and soil types significant affect the thickness of leaf of flue-cured tobacco leaves, while cultivars and altitudes do not. Of B2F rank,the highest of the thickness of leaf is established at Yongshun county, but the lowest at Baojing county; in C3Fgrade, the highest one is found at Huayuan county, the lowest at Baojing county. In X2F grade, the highest the thickness of leaf is at Baojing county, the shortest at Fenghuang county. The spatial distribution shows the east and west high and central low tendency.(8)The differense of weight per unit leaf area of flue-cured tobacco leaves among different positions and soil types were significant, while cultivars and altitudes do not.In B2F grade,the highest of the weight per unit leaf area is established at Yongshun county, but the lowest at Baojing county; in C3Fgrade, the highest one is found at Huayuan county, the lowest at Baojing county. However, the highest the weight per unit leaf area of X2F rank is at Baojing county, the shortest at Fenghuang county. The spatial distribution shows the east and west high and central low tendency.(9)The balance water ratio of flue-cured tobacco leaves shows significant difference among different positions, but the difference among cultivars, soil types and altitudes were no-significant. The highest of balance water ratio of B2F and C3F rank is from Longshan county, the lowest one from Luxi county. Of X2F rank, the highest is showed at Yongshun county, the lowest at Luxi county. The spatial distribution has increasing trend from southeast to northwest.(10) Compared with flue-cured tobacco leaves of Zimbabwe and Brazil, weight per leaf, stem ratio, thickness of leaf and weight per unit leaf area has bigger difference,and no difference in balance water ratio.And Xuchang of Henan, Qianxinan of Guizhou difference is small, and Chenzhou of Hunan, Qujing and Dali of Yunnan difference is relatively large.