[Distribution characters of sulfur in flue-cured tobacco leaf and available sulfur in soil in hunan tobacco-growing areas].

Through field survey and laboratory analysis, this paper studied the distribution characters and interrelationships of sulfur in flue-cured tobacco leaf and available sulfur in soil in Hunan tobacco-growing areas of China. The results indicated that in Hunan tobacco-growing areas, the sulfur content in flue-cured tobacco leaf was relatively high as compared with other tobacco-growing areas in China, which ranged from 0.34% to 1.49%, with the mean of (0.81 +/- 0.26)%. 39.29% of the leaf samples had a sulfur content of < 0.70%, and the sulfur content in different grades of flue-cured tobacco leaves was B2F > C3F > X2F. The available sulfur content in soil was rich, which ranged from 2.20 to 217.60 mg x kg(-1), with the mean of (37.16 +/- 27.59) mg x kg(-1). Among the soil samples collected, 22.58% of them were considered as lack of sulfur ( < or =16.0 mg x kg(-1)), 26.08% had an available sulfur content exceeding 50.0 mg x kg(-1), and 51.34% could satisfy the sulfur demand of high quality tobacco. The available sulfur content in different types of soil was in the order of duck feces mud > yellow mud field > red yellow mud > blue mud field > sand mud field > yellow ash soil > yellow soil. There was a very significant positive correlation between the contents of sulfur in flue-cured tobacco leaf and available sulfur in soil (r = 0.469, P < 0.01).