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A procedure developed for determining organic phosphorus in soils consisted of successive extractions with concentrated HCl and 0.5 N NaOH at room temperature, and 0.5 N NaOH at 90° C. The difference in content of inorganic and total phosphorus in the combined extracts was taken as total organic phosphorus in the soil. In a group of soils, values obtained by the proposed method were higher than those by other methods. Tests indicated that the higher values resulted from the greater accuracy of the proposed method.

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