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Testing Chemical Criteria for Spodic Horizons on Podzolic Soils in Canada¹

ABSTRACT

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.

¹ Contribution from Land Resource Research Institute, no. 82-72 Ottawa, Ontario; Agriculture Canada Ste. Foy Research Station, Quebec no. 206; and Dep. of Land Resource Science, Univ. of Guelph, Ontario.

² Scientists, Land Resource Research Institute, Ottawa, Ontario.

³ Scientists, Agriculture Canada, Ste. Foy Research Station, Quebec.

⁴ Associate Professor, Dep. of Land Resource Science, Univ. of Guelph, Ontario.

Received for publication December 6, 1982. Accepted for publication April 14, 1983.