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ABSTRACT
Neutralization of soil Al to a minimum value is one approach to liming acid soils. The objective of this study was to determine which chloride extracting solution removed the quantity of soil Al that readily reacts with limestone and reduces the Al saturation to < 15%. Soils were incubated for 8 weeks after being limed at rates needed to neutralize the Al removed by KCl, LaCl3, and CuCl2. Six soils with a range in organic matter contents were used. When the Al extracted by KCl was used to predict the lime rate, soils containing organic matter had a large amount of residual KCl-extractable Al and a soil pH below 5.0. The lime rate predicted by the Al removed with LaCl3 reduced the residual Al to < 15% Al saturation for all soils. If residual Al is the criterion for evaluating limed soil, then LaCl3 is the best extracting solution. The LaCl3 not only removes the same amount of Al as KCl from the clay fraction of the soil, but also removes organically bound Al that influences the soil solution Al.
1 Journal Series no. 8526 of the North Carolina Agricultural Research Service, Raleigh, NC 27650.
2 Former Research Assistant and Professor, respectively, Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27650.
Received for publication January 10, 1982. Accepted for publication March 31, 1983.
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