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This article in SSSAJ

  1. Vol. 41 No. 1, p. 148-149
    Received: July 29, 1976
    Accepted: Sept 29, 1976

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Determination of Inorganic Phosphorus in Oxalate Extracts of Soils1

  1. L. B. Owens,
  2. D. W. Nelson and
  3. L. E. Sommers2



A simple and rapid procedure for the determination of inorganic phosphorus in acid ammonium oxalate extracts of soils was developed by modifying the ascorbic acid-molybdenum blue colorimetric method. The oxalate interference in the determination of P was overcome by addition of excess ammonium molybdate. A molar ratio of molybdate to oxalate, in the final solution, of 2.51:1 was required in order to eliminate the oxalate interference.

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