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Modern Concepts of the Genesis of Podzols¹

ABSTRACT

The major processes suggested in the literature for the formation of Podzols have been reviewed. Theories on the formation of negatively charged humus-protected sols and of metal-organic coordination complexes, including chelates, and on the immobilization of the sesquioxides and organic matter in the B by microbial activity, sorption and oxidation have been presented. It is concluded that, while the theories of complex formation and possibly chelation appear reasonable, more factual information is required on the constitution of the reacting organic substances and on the precipitation mechanism involved.

¹ Contribution from the Field Husbandry Division, Experimental Farms Service and the Chemistry Division, Science Service, Canada Department of Agriculture, Ottawa. Contribution No. 382, Chemistry Division. Presented before Div. V, Soil Science Society of America, Nov. 18, 1957, at Atlanta, Ga.

² Principal Pedologist, Experimental Farms Service, and Chemist, Science Service, respectively.

Received for publication December 19, 1957. Accepted for publication February 7, 1958.