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This article in SSSAJ

  1. Vol. 33 No. 4, p. 635-637
    Received: Feb 14, 1969
    Accepted: Apr 14, 1969

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Primary and Secondary Origin of “Nonextractable” Soil Inorganic Phosphorus1

  1. J. K. Syers,
  2. J. D. H. Williams,
  3. E. H. Tyner and
  4. T. W. Walker2



“Nonextractable” soil inorganic phosphorus can have both a primary and a secondary origin. Apatite included within other minerals and phosphorus distributed throughout mineral lattices constitute the primary sources. “Nonextractable” secondary phosphorus accumulates during soil development and is associated with hydrated sesquioxides.

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