Influence of Potash Fertilizer Types and Application Proportion on Flue-cured Tobacco Yield and Quality

A field experiment was conducted to investigate the effect of combining application of various potassium (K) fertilizers on yield and quality of flue-cured tobacco. The results showed that it was not favorable to flue-cured tobacco growth when only potassium sulphate or potassium fulvic acid was applied. When the application proportion of potash fertilizer types between potassium sulphate and potassium fulvic acid was 3:7, flue-cured tobacco development was the best. The application proportion of potash fertilizer types between potassium sulphate and potassium fulvic acid which had the highest yield, output value and single leaf weight was 3:7, but the agronomic characters declined with the potassium sulphate application proportion increase. Potassum fulvic acid applying could improve appearance quality of tobacco leaves after curing, but there was no significant effect when the potassium fulvic acid application proportion was less than or equal to 5:5. The application proportion of potash fertilizer types between potassium sulphate and potassumfulvic acid which had the best appearance quality was 3:7. Cured leaves with the application proportion of potash fertilizer types between potassium sulphate and potassumfulvic acid was equal to 3:7 had the highest potassium content. For smoking quality, cured leaves applied with only potassium fulvic acid were better.