Abstract: In order to explore the influence of soil on the characteristic quality of tobacco leaves in Nanping city tobacco growing area, K326 flue-cured tobacco leaves and tobacco planting soil in Nanping main tobacco producing area were used as materials to determine the content of soil organic matter, available nutrients, mineral elements and smoking indexes of tobacco samples, and their correlation was analyzed. The results showed that there were some differences in the content of soil components in different tobacco growing areas. On the whole, soil acidity and alkalinity were suitable, but chlorine content was generally low, soil organic matter content was medium to rich, soil total nitrogen level was low, magnesium content was rich in exchangeable cations, calcium content was low, phosphorus content was rich, potassium content was low. The overall aroma quality of tobacco leaf was good, permeability was prominent, aroma content was sufficient. The flue gas concentration was slightly higher, the fineness was better, the impurities were slightly lower, the irritation was smaller, and the aftertaste was cleaner. The permeability of flue-cured tobacco was negatively correlated with soil pH, positively correlated with soil organic matter, and positively correlated with soil alkali-hydrolyzed nitrogen, exchangeable calcium and available potassium.

Key words: flue-cured tobacco, Nanping city, soil nutrient, correlation