Effects of combined application with different ratios of organic fertilizers on photosynthesis,yield and quality of flue-cured tobacco

In this experiment,different fertilizer treatments were applied on flue-cured tobacco planted in paddy soil to study the effects of combined application of inorganic and organic fertilizers on the photosynthesis,yield and quality of flue-cured tobacco.The results showed that 30% of organic-N fertilizer in total N application was very suitable for improving photosynthesis of tobacco,making nitrogen metabolism weak at the later stage,increasing C / N rate and improving carbon-nitrogen metabolism.Moreover,the yield of flue-cured tobacco was increased by 8.1% compared to the chemical fer-tilizer treatment;the total sugar,reducing sugar,nicotine,protein and other main chemical components tended to coordinate in a range of high-quality content in flue-cured tobacco.However,when the application of organic fertilizer was in excess,it would had adverse influences on the yield and quality of flue-cured tobacco.