Regional Diversity Analysis of Grade B2F Flue-Cured Tobacco Surface Color

Wang Gaili; Yu Jianjun; Zheng Xianbin; Wei Chunyang; Li Yue; Hu Jianjun; Zhen Huanju

doi:10.14083/j.issn.1001-4942.2017.04.004

Abstract：In order to reveal the regional disparities of surface color of grade B2F flue-cured tobacco, the grade B2F flue-cured tobacco leaves from 14 provinces in 2015 were used as experimental materials.Using the methods of multiple comparison and system clustering, the surface color of tobacco leaves was quantitatively analyzed.The results showed that: (1) the spatial distribution features of flue-cured tobacco surface color were brightness (L*) as 47.72～60.29, red degree (a*) as 15.61～18.89, yellow degree (b*) as 39.00～50.62, color saturation (C*) as 42.41～53.76.(2) There were strong regional differences in leaf surface color of grade B2F flue-cured tobacco.The brightness (L*) of tobacco leaves from the upper-middle reaches of Yangtze River was significantly higher than that from the Southeast and the Southwest areas, and that from the Southeast area was significantly lower than that from the other four areas.The red degrees (a*) of tobacco leaves from the Southwest area was significantly higher than that of the Southeast,the Huanghuai and the North areas.The yellow degree (b*) and color saturation (C*) of leaves from the upper-middle reaches of Yangtze River were significantly higher than those from the Southeast,the Huanghuai and the North areas.(3) The characteristics of grade B2F tobacco leaf surface color could be classified into four types, and showed stronger regional diversity.The first type was mainly centralized in the Huanghuai and the North areas showing weaker red degree.The second type was centralized in the Southeast area showing lower brightness, yellow degree and saturation.The third type was centralized in the Southwest area and Chongqing region showing the most obvious red degree.The fourth type was centralized in Liangshan Prefecture of Sichuan Province and part of the Southwest area showing higher brightness, yellow degree and saturation.