Pedosphere 21(3): 302--308, 2011
ISSN 1002-0160/CN 32-1315/P
©2011 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Amendment of acid soils with crop residues and biochars |
| YUAN Jin-Hua1,2, XU Ren-Kou1, WANG Ning1 and LI Jiu-Yu1 |
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);
2 Graduate University of Chinese Academy of Sciences, Beijing 100049 (China) |
| ABSTRACT |
| The liming potential of some crop residues and their biochars on an acid Ultisol were investigated using incubation experiments. Rice hulls showed greater liming potential than rice hull biochar, while soybean and pea straws had less liming potential than their biochars. Due to their higher alkalinity, biochars from legume materials increased soil pH much compared to biochars from non-legume materials. The alkalinity of biochars was a key factor affecting their liming potential, and the greater alkalinity of biochars led to greater reductions in soil acidity. The incorporation of biochars decreased soil exchangeable acidity and increased soil exchangeable base cations and base saturation, thus improving soil fertility. |
| Key Words: alkalinity, exchangeable base cations, inorganic N, liming potential, soil acidity |
| Citation: Yuan, J. H., Xu, R. K., Wang, N. and Li, J. Y. 2011. Amendment of acid soils with crop residues and biochars. Pedosphere. 21(3): 302-308. |
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