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What is exchange acidity?

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Anonymous

9y ago
Updated: 4/14/2022

Exchangeable acidity is a measure of the amount of a soil's cation exchange capacity (CEC) that is occupied by acidic cations.

By acidic cations, soil scientists generally mean H+ and Al3+, but it can also include Fe and Mn cations. Aluminum and iron cations will combine with OH- ions and take it out of solution, forming an insoluble compound.

Exchangeable acidity is typically reported as a percentage of CEC, or in milliequivalents/100 g of soil.

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Abbie Hyatt

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3y ago

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