Effects of Different Organic Acids on Growth and Physiological Metabolism of Flue-cured Tobacco

The pot trial was conducted to systematically study the effects of different organic acids on the growth and physiological metabolism of flue-cured tobacco.The main results were as follows: In early and mid growing stages,the three organic acids(malic acid,oleic acid and FA) could obviously promote the growth and development of flue-cured tobacco and increase the activities of nitrate reductase and invertase in tobacco leaves,which was in favor of N metabolism.In later growing period,malic acid and oleic acid could obviously decrease the content of leaf chlorophyll,the activities of nitrate reductase and the content of the free amino-acids of tobacco leaves,while FA could remarkably promote the content of carotenoid and decrease the activitie of invertase in tobacco leaves,which was in favor of C metabolism.