Abstract: In order to explore the stability and annual change trend of the chemical composition of flue-cured tobacco in Hubei province tobacco area, five representative villages were selected from 2010 to 2018 for fixed tobacco planting. The flue-cured tobacco variety K326 and unified cultivation technology measures were adopted for tobacco production. C3F tobacco samples were collected from each pilot after the end of each year for analysis of the conventional chemical composition and the change trend was analyzed. The results showed that the content of the main chemical components of the tobacco leaves in Hubei province was in a suitable range, and the content of various chemical components in the tobacco leaves in different regions fluctuated with the change of the year, and the content of the same chemical components in the same year was different in different regions. Among them, the nicotine content fluctuated greatly, followed by sugar content, while the fluctuation of potassium content and total nitrogen content was relatively small.

Key words: tobacco area of Hubei province, flue-cured tobacco, chemical component, change