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Amendment of Acid Soils with Crop Residues and Biochars

作者：

Jin Yuan;Runsheng Xu;Ning Wang;Jiu-yu L

单位：

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China;State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);Graduate University of Chinese Academy of Sciences, Beijing 100049 (China)

关键词：

biochars;liming;potential;alkalinity;increased;soi

摘要：

The liming potential of some crop residues and their biochars on an acid Ultisol was 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

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Amendment of Acid Soils with Crop Residues and Biochars

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