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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).
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PMID:[Distribution characters of sulfur in flue-cured tobacco leaf and available sulfur in soil in hunan tobacco-growing areas]. 1826 Apr 56

A total of 559 flue-cured tobacco samples with 3 grades (B2F, C3F and X2F) were collected from the main tobacco-growing areas in Hunan Province, and their sulfur contents were determined to study the regional characteristics of the sulfur contents and their quantitative correlations with the evaluation indices of smoking quality. The results showed that the sulfur content in the flue-cured tobacco was 0.100%-2.106% , with a mean of 0.884%. The samples with sulfur content above 0.7% accounted for 71.56% of the total. The sulfur content decreased gradually from the high sulfur content area of Central Hunan to South Hunan and Northwest Hunan. With increasing sulfur content in tobacco leaf, the aroma quality, aftertaste, combustibility and ash color went to bad, offensive odor and irritation property increased, and aroma taste, eat-taste and total smoking quality score fell down. Under the influence of applying larger amount sulfate potassium and of sulfur-type acid precipitation, the sulfur content in tobacco leaf was somewhat higher in partial areas of Hunan Province, and gave negative impact on tobacco quality, being one of key factors limiting the improvement of tobacco quality and ought to be attached enough importance in tobacco production.
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PMID:[Regional characteristics of sulfur contents in flue-cured tobacco in Hunan Province and their influence to smoking quality]. 1833 66