The highest rates of acidity generation occurred within the first 20 days of incubation.
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Soil pH decreased rapidly by ~ 2–3 units, while titratable actual acidity increased.
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RIS species decreased over time.
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The reactive pool of Fe (III) minerals (e.g. schwertmannite) increased.
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Sites located at lower elevations contained higher initial RIS and generated more acidity.
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The magnitude of acidity generation was less than the theoretical calculations.
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