Effect of Malic Acid on the Flue-cured Tobacco Quality

Carbohydrate had a decreasing tendency and the nitrogen had an increasing tendency in tobacco leaf when malic acid was applied.The application of malic acid had few effects on the content of nonvolatile organic acid in leaf,but large effect on the increment of the content and proportion of polypolidy carboxylic acid and decrement of the content and proportion of saturated fatty acid and non-saturated fatty acid.And also the content of malic acid was increased in upper and lower leaf,but few effect was done on oxalate and other polypolidy carboxylic acid.The treatment of malic acid increased the total content of flavor matter,the content of cembratriendiol group,phenylalanine group and browning products in cutters.So the application of malic acid took active effect on the improvement of leaf quality.