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This article in SSSAJ

  1. Vol. 47 No. 5, p. 1052-1054
    Received: Dec 6, 1982



Testing Chemical Criteria for Spodic Horizons on Podzolic Soils in Canada1

  1. J. A. McKeague2,
  2. C. Wang2,
  3. G. M. Coen2,
  4. C. R. DeKimpe3,
  5. M. R. Laverdiere3,
  6. L. J. Evans4,
  7. B. Kloosterman2 and
  8. A. J. Green2



Application of chemical criteria of the spodic horizon to 220 Podzolic pedons from Canada excluded 157 of them from Spodosols. Failure of approximately 60% to meet the required ratio (0.2) of pyrophosphate-extractable (Fe + Al) to clay was the principal factor. The requirement that at least one-half of the dithionite-citrate extractable (Fe + Al) be extractable by pyrophosphate was not met by approximately 40% of the Podzolic pedons. Modified chemical criteria for the spodic horizons are proposed.

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