In order to explore the effects of different types of potassium fertilizer and application period on the yield and quality of upper leaves of tobacco in Changsha tobacco area and improve the industrial availability of upper leaves.In this study,Yunyan 87,the main local cultivate,was used as the experimental material.Through field test,5 treatments were set up in random block arrangement,and 3 replicates were performed.The results showed that different types and application periods of potassium fertilizer had certain effects on the agronomic traits of tobacco plants.T1 treatment was superior to other treatments in terms of plant height,leaf number and leaf area.Different types and application periods of potassium fertilizer could promote the appearance quality of flue-cured tobacco,and there was no significant difference between T1 and T4 treatment.Different types and application periods of potassium fertilizer could improve the chemical composition and coordination of tobacco after roasting,and could improve potassium and reduce alkali to a certain extent,among which T1 treatment had the highest content of total sugar and reducing sugar,and its coordination was better than other treatments.Different types and application periods of potassium fertilizer had great influence on the sensory quality of tobacco after roasting.The total score of sensory evaluation of T1 treatment was the highest,and the aroma quality,aroma quantity,fineness and aftertaste were higher than those of the control group.The economic properties of flue-cured tobacco were improved by different types of potassium fertilizer and application period.T1 treatment significantly improved the economic properties of flue-cured tobacco and could increase the income of tobacco farmers to the greatest extent.In summary,different types and application periods of potassium fertilizer could affect the field growth of tobacco plants and the tobacco production quality after the upper leaves were roasted.The improvement of tobacco leaves by applying potassium fulvic acid in various aspects was better than that of liquid potassium fertilizer,and the effect of applying potassium fulvic acid in seedling stage(T1 treatment)was the best.
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