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RESEARCH ARTICLE

The partition of basic exchangeable cations

BM Tucker

Australian Journal of Soil Research 13(1) 77 - 89
Published: 1975

Abstract

The sets of basic exchangeable cations in soil samples can be divided into subsets by changing the conditions under which their displacement takes place. Using a large cation (cholinium) in a nonaqueous solvent (alcohol), primary subsets of exchangeable calcium, magnesium and sodium are displaced. When ammonium ion in an aqueous solvent is used after this primary displacement, a conditionally exchangeable subset is obtained. Potassium is almost completely conditionally exchangeable in the soils studied. The conditional subsets may be further divided depending on whether the condition of using a smaller displacing cation (NH4+) or of having water present is met first. The concept of partition by exchange conditions is distinct from a partition based on exchange constants (under unchanged conditions) to which the epithets easily and difficultly exchangeable are appropriate.

https://doi.org/10.1071/SR9750077

© CSIRO 1975

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