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Base exchange equilibria in soil profiles

Published online by Cambridge University Press:  27 March 2009

R. L. Mitchell
R. L. Mitchell
Affiliation:
Macaulay Institute for Soil Research, Aberdeen
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Extract

1. The conditions governing base exchange equilibria in soil profiles are discussed.

2. Exchangeable cation contents of six profiles are reported, the results including figures for Ca, Sr, Mg, Na, K, H and exchange capacity, as well as clay content and pH value.

3. It is shown that cation displacement occurs as a result of the downward movement of hydrogen ions from the surface layers, and a layer of minimal basic cation content exists at about 30 cm. depth.

4. Below this depth the basic cation content increases once again, but the base exchange capacity follows the clay content fairly closely.

5. Calcium and strontium are displaced (and readsorbed) at similar rates, in accordance with their exchange constants, although there is about 400 times as much calcium as strontium present. The behaviour of the other cations also appears to be in accordance with theoretical demands.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 27 , Issue 4 , October 1937 , pp. 557 - 568
Copyright
Copyright © Cambridge University Press 1937

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References

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