烤烟烟叶pH值的对比分析

测定了210个复烤烟叶样品的pH值,并分析了不同年份、产区、部位、等级和颜色烤烟烟叶pH值的差异。结果表明:①不同产区烤烟烟叶pH值集中在4.8～5.4范围内,且pH值变异系数不大;②烤烟烟叶pH值随着自然陈化时间的增加而逐渐减小,2002和2003年烟叶pH值与2001、2000和1999年烟叶pH值差异极显著;③2000、2002和2003年不同产区烟叶pH值差异均显著或极显著;④1999、2000和2001年不同部位、不同等级烟叶pH值差异不显著,而2002和2003年差异极显著;⑤1999和2000年桔黄和柠檬黄烟叶pH值差异不显著,而2001、2002和2003年差异显著,总体来看,柠檬黄烟叶pH值大于桔黄烟叶。

Contrastive Analysis of pH Values of Flue-cured Tobacco Leaves

The pH values of 210 redried flue-cured tobacco samples were determined and the difference of pH values between tobacco leaves of different crop years, growing areas, stalk positions, grades and colors was analyzed. The result showed that: 1) the pH values of samples from different growing areas ranged between 4.8 and 5.4, with small variation coefficients; 2) the pH values of tobacco leaf decreased with the progress of aging, and the pH values of leaves cropped in years 2002 and 2003 differed extremely significantly with those of leaves cropped in 2001, 2000 and 1999; 3) the pH values of 2000, 2002 and 2003 leaves from different growing areas differed significantly or extremely significantly; 4) the pH values of 1999, 2000 and 2001 leaves from different stalk positions or of different grades did not show significant difference, while those of 2002 and 2003 leaves did; 5) the pH values of 2001, 2002 and 2003 leaves of different colors differed significantly, while those of 1999 and 2000 leaves did not; generally, the pH value of lemon leaves was higher than that of orange leaves.