Effects of different proportions of organic and inorganic fertilizers on yield and quality of tobacco

To find the best ratio of organic and inorganic fertilizer and the optimal combination model for Changsha Ecological Organic Tobacco，the effects of organic and inorganic fertilizer on yield and quality of flue-cured tobacco were studied. The results showed that the organic fertilizer could improve the quality of tobacco，including the strains plant height，leaf number，leaf area and single leaf weight，make the total sugar content and potassium content increased，and made the nicotine content decreased. Comprehensive comparison and analysis showed that the application of organic fertilizer（ organic fertilizer 50 kg/667 m2 +rapeseeds cake fertilizer 40 kg/667 m2 +biochar 50 kg/667 m2 +humic acid 25 kg/667 m2）and inorganic fertilizer ratio（ flue-cured tobacco special fertilizer 40 kg/667 m2 +promoting fertilize 2 kg/667 m2 +potassium sulfate 15 kg/667m2+potassium nitrate 10 kg/667 m2）was the best， the ratio of organic nitrogen and of inorganic nitrogen wuth 5.2∶4.96 could raise the yield and quality of flue-cured tobacco.