Changes in exchangeable cations and exchange capacity of soil consequent on oxidation of its organic matter

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Abstract
1. Loss of ignition at 450°C. and the organic carbon content of some shale soils are positively correlated (r = +0·99).2. Base exchange capacities and exchangeable cations were determined on soils, treated and untreated with hydrogen peroxide solution.3. Oxidizing the organic matter lessened the exchange capacities of all samples; the exchange capacity of the organic matter varied from 67·5 to 97·0 m-equiv./1OO g. dry material.