Impact of controlled-release compound fertilizer on flue-cured tobacco leaf antioxidant system

Pot experiments were conducted to study the effects of controlled-release compound fertilizer on antioxidant system of flue-cured tobacco leaves.Comparing with no fertilizer application,results indicated that ordinary compound fertilizer and con-trolled-release compound fertilizer greatly improved the contents of chlorophyll,carotenoids(50～65 days after transplant) and asor-bic acid(AsA),as well as superoxide dismutase(SOD) activity(35～65 days after transplant).This significantly reduced the contents of carotenoids(80 days after transplant) and malondialdehyde(MDA),as well as the production rate of superoxide() anion free radicals.Meanwhile,peroxidase(POD) activity and glutathione(GSH) content improved to some extent.Controlled-release compound fertilizer had greater influence on the physiological properties of flue-cured tobacco leaves than ordinary compound fertilizer.