Testing Chemical Criteria for Spodic Horizons on Podzolic Soils in Canada
1983
McKeague, J. A. | Wang, C. | Coen, G. M. | DeKimpe, C. R. | Laverdiere, M. R. | Evans, L. J. | Kloosterman, B. | Green, A. J.
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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