Pedosphere 15(3): 281--285, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Transformation Efficiency of sulfur for a mulberry leaf-silkworm cocoon system in the lower-middle reaches of the Yangtze River, China |
ZHAO Yan-Wen 1,2, HU Zheng-Yi2, CAO Zhi-Hong2, J. D. BEATON3, A. M. HENDERSON3, M. X. FAN4 and XU Cheng-Kai2 |
1 College of Agriculture, Nanjing Agri. Univ., Key Lab. of Crop Growth Regulation, Ministry of Agri., Nanjing 210095 (China). E-mail:ywzhao@njau.edu.cn;
2 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);
3 Fernz SulFer Works Inc., P.O. Box 9, Irricana, AB. TOM 1B0 (Canada);
4 The Sulphur Institute, Washington, DC 20036 (USA) |
| ABSTRACT |
| Cocoon samples were collected from fifty-two mulberry gardens with high, intermediate, and low silkworm cocoon productivities in the lower-middle reaches of the Yangtze River in the six China's provinces of Jiangsu, Jiangxi, Anhui, Fujian, Hunan, and Hubei to determine the transformation efficiency of S from mulberry leaves to silkworm cocoons, and to evaluate the sulfur cycle (uptake and output) in the mulberry leaf-silkworm cocoon system with typical mulberry gardens in the lower-middle reaches of the Yangtze River in China. The transformation efficiency of sulfur (TES) from mulberry leaves into silkworm cocoons in the high-productivity mulberry gardens was significantly lower (P < 0.05) than that in the low-productivity gardens. For the high-productivity mulberry gardens the TES from mulberry leaves into the cocoon shells was significantly higher (P < 0.05) than that for low-yield mulberry gardens. Producing 1 kg dry cocoon in mulberry gardens required uptake of about 20 g S, however 1 kg of dry cocoon only removed about 4 g S. Therefore, recycling of these organic wastes with silkworm cultivation was important for sulfur balances. |
| Key Words: mulberry leaves, silkworm cocoon, sulfur, transformation efficiency |
| Citation: Zhao, Y. W., Hu, Z. Y., Cao, Z. H., Beaton, J. D., Henderson, A. M., Fan, M. X. and Xu, C. K. 2005. Transformation Efficiency of sulfur for a mulberry leaf-silkworm cocoon system in the lower-middle reaches of the Yangtze River, China. Pedosphere. 15(3): 281-285. |
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