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Some Chemical Characteristics of the Organic Matter Extracted from the O and B2 Horizons of a Gray Wooded Soil¹

ABSTRACT

Organic matter extracted from the O and B2 horizons of a Gray Wooded soil was characterized by ultimate and functional group analyses and by infrared spectroscopy. The analytical data were compared with those obtained by the use of the same methods on Podzol O and Bh organic matter.

The experimental data indicated that Gray Wooded humic and fulvic acids were chemically similar to Podzol humic and fulvic acids except that Gray Wooded organic matter contained more phenolic hydroxyl groups. In analogy with Podzols, approximately 70% of the organic matter extracted from the Gray Wooded O horizon was humic acid, while 90% of the extract from the B2 horizon consisted of fulvic acid.

Gray Wooded organic matter was difficult to extract and purify because of intimate association with clay and possibly other inorganic constituents.

¹ Contribution No. 83, of the Soil Research Institute, Research Branch, Canada Department of Agriculture, Ottawa, Ont. The authors are grateful to J. S. Clark for providing the soil samples and to G. F. Morris for ultimate analyses.

² Research Officer and Post-doctoral Fellow of the N.R.C. of Canada, respectively.

Received for publication August 9, 1963. Accepted for publication October 17, 1963.