Effect Of Organic Acid And Organic Matterials Of Different C/N Rates On Growth And Quality Of Flue-cured Tobacco

The paper systematically studied the effects of organic acids and organic materials of different C/N rates on the growth and quality of flue-cured tobacco. The main results were as follows:1. Organic acids could promote the growth of flue-cured tobacco, increase the content of leaves chlorophyll, the activities of nitrate reductase, invertase, amylase of leaves and root activities, reduce the content of MDA in flue-cured tobacco. Organic acids could also increase the accumulation of N, P, K in flue-cured tobacco. But effects of different kind of organic acids were different. The effects of malic acid, citric acid and lactic acid were better than those of benzoic acid and humic acid.2. Flue-cured tobacco could change from N metabolism to C metabolism at timing by use of lactic acid and malic acid combined with humic acid, malic acid and citric acid combined with humic acid could reduce the content of nicotine, increase the contents of total sugar and reducing sugar in tobacco leaves, and reduce the content of starch in topping leaves. But the effects of citric acid and benzoic acid combined with humic acid were better than CK and humic acid applied, respectively.3. Oleic acid was superior to palmitic acid , stearic acid in declining content of chlorophyl and the activity of nitrate reductase, increasing the activity of invertase and amylase. Oleic acid could increase P content of tobacco leaves and reduce chloridion and nicotine content, oleic acid treatment was better than other treatments in coordination of chemical composition, this was in favor of promoting the quality of tobacco leaves. Oleic acid could accelerate the tobacco leaves growing yellow and the leaves of oleic acid treatment was rich in oil by appearances.4. The organic materials of C/N 20-40 could not only increase the area of leaves and...