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Distribution of Silica, Sesquioxides, and Clay in Quebec Podzolic Soils and Their Effects on Subsoil Cementation¹

ABSTRACT

Three soil profiles containing two types of brittle horizons were extracted using citrate-hicarbonate-dithionite (CBD), a modified CBD, and NaOH procedures. The modified CBD method with a low soil-solution ratio was the most effective extractant for Fe, Al, and, especially, Si. Increases in extractable Si could be associated with the presence of a fragipan-duripan intergrade horizon, but a similar relationship was not observed with a well-expressed fragipan.

¹ Contribution no. 215, Agriculture Canada, Station de Recherches, Sainte-Foy.

² Research Scientists, Agriculture Canada, 2560, boul. Hochelaga, Sainte-Foy (Québec), G1V 2J3; and Maître de Recherches, INRA, Station de Mondésir, Clermont-Ferrand Cedex 63039, France.

Received for publication November 18, 1982. Accepted for publication March 18, 1983.