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Cation Exchange Capacity and Exchangeable Aluminum in Natal Oxisols¹

ABSTRACT

Positive charges in acid soils reduce CEC at low electrolyte concentration probably by double layer interaction. The resultant net ECE (determined by washing soil free of salt with water) is the effective CEC under field conditions and the difference between net CEC and exchangeable bases is accordingly a convenient measure of exchangeable Al. A reaction scheme is proposed which relates the large pool of nonexchangeable Al (extractable with 1N NH₄OA_c-pH4) in these soils to the relatively small amounts of exchangeable Al; this reaction scheme is governed primarily by net CEC and exchangeable bases rather than by pH.

¹ Contribution from the Departments of Soil Science, Cedara College of Agriculture and University of Natal, Pietermaritzburg, S. Africa. Supported in part by the Department of Agricultural Technical Services of the Republic of S. Africa.

² Research Soil Scientist and Senior Lecturer, respectively.

Received for publication June 6, 1970. Accepted for publication September 18, 1970.