Abstract: In order to explore the adaptability of flue-cured tobacco variety Yunyan 87 to threshing intensity and redrying intensity, the experiment was conducted with the middle C3F and upper B2F tobacco leaves of Yunyan 87 as materials, and five threshing intensities and five redrying intensities were set to study their effects on the percentage of large and medium slices, stalk content and sensory quality of tobacco leaves after threshing and redrying. The results showed that with the increasing of threshing intensity, the stalk-containing rate of the middle leaves showed an overall upward trend, and the upper-leaf stalk rate showed an overall trend of first increasing and then decreasing. The highest and lowest stem content of middle leaves were 1.53% and 1.43% respectively, and the highest and lowest stem content of upper leaves were 1.06% and 0.83% respectively; the content of thick stalks in the middle and upper leaves did not change much. With the increasing of threshing intensity in the middle leaves, the ratio of large pieces, fragments and broken pieces decreased, the rate of medium and small pieces showed an overall increasing trend, and the rate of large and medium pieces did not change much. With the increasing of the threshing intensity of the upper leaves, the large and medium flake rates first increased and then decreased, and the medium flake rate, the small flake rate, the fragment rate and the powder rate showed a trend of first decreasing and then increasing. With the decreasing of the re-baking intensity, the strength of the middle leaves was the highest at the intensity 2; the transparency and the thick feeling showed a decreasing trend; the smoothness, longness, softness and roundness were all the best at the intensity 3. The strength, transparency and thickness of the upper leaves decreased with the reduction of the redrying intensity; the smoothness, longness, softness and roundness were all the best at intensity 3. To sum up, high-strength threshing could effectively reduce the rate of large leaves in the middle leaves, increase the rate of medium leaves, reduce the rate of fragments and powders, and help control the structural indicators of tobacco leaves; the intensity of 2 could satisfy standard requirements for both the large and medium rates of upper leaves. Redrying intensity 3 had the smallest loss of aroma, which was beneficial to reduce miscellaneous air, and the overall sensory quality was better.

Key words: Yunyan 87, threshing and redrying, sensory evaluation