Effects of N Application on Growth and Formation of Yield and Quality of Flue-cured Tobacco

[Objective] The research aimed to verify the appropriate N application and yield and quality of flue-cured tobacco K326 in Fuzhou.[Method]Taken K326 as test variety,105,120,135,150 and 165 kg/hm2 nitrogen fertilizer were applied in the Tobacco Science Park of Yihuang in Fuzhou City in 2013.[Result]With the increase of N application,the biological yield of flue-cured tobacco K326 increased,the economic characters and the output of tobacco leaves increased frist and then decreased. More N used extended the field growth period,reduced leaf number,increased leaf area,lowered the carbohydrates and K2 O in leaves significantly,while increased the content of total nitrogen and alkaloid significantly.[Conclusion]N application of 135 kg / hm2 resulted in proper yield,highest production value,good balance of chemical compositions,and better quality of appearance and smoking.