Pedosphere 12(2): 185--188, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Alleviation of soil acidity and aluminium phytotoxicityin acid soils by using alkaline-stabilised biosolids
LUO Yong-Ming1 and P. CHRISTIE2
1 Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)
2 Department of Agricultural and Environmental Science, The Queen's University of Belfast, Newforge LaneBelfast, BT9 5PX (UK)
ABSTRACT
      A pot experiment was catried out to study alleviation of soil acidity and Al toxicity by applying analkaline-stabilised sewage sludge product (biosolids) to an acid clay sandy loam (pH 5.7) and a strongly acidsandy loam (pH 4.5). Barley (Hondeum vulgare L. cv. Forrester) was used as a test crop and was grownin the sewage sludge-amended (33.5 t sludge DM ha-1) and unamended soils. The results showed that thealka1ine biosloids increased soil pH from 5.7 to 6.9 for the clay sandy loam and from 4.5 to 6.0 for the sandyloam. The sludge product decreased KCl-extractable Al from 0.1 to 0.0 cmol kg-1 for the former soil and from 4.0 to 0.1 cmol kg-1 for the latter soil. As a result, barley plants grew much better and grain yieldincreased greatly in the amended treatments compared with the unamended controls. These observationsindicate that alkaline-stabilised biosolids can be used as a liming material for remedying Al phytotoxicity instrongly acid soils by increasing soil pH and lowering Al bioavailability.
Key Words:  alkaline biosolids, phytotoxicity, soil acidity, soil remediation
Citation: Luo, Y. M. and Christie, P. 2002. Alleviation of soil acidity and aluminium phytotoxicityin acid soils by using alkaline-stabilised biosolids. Pedosphere. 12(2): 185-188.
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