Studies on the more soluble complexes of soil organic matter

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Abstract
The fulvic extract of soil organic matter from heather raw humus, gardener''s turf soil, sphagnum-cottongrass peat, and pine raw humus, was adsorbed on animal charcoal at pH 2.5-3. The clear filtrate constituted fraction A. Elution with 90% acetone gave fraction B, with dist. water fraction C, and with 0.5 [image] NaOH fraction D. Fraction A contained the simple degradation products; fraction B, phenolic glycosides and a trace of carbohydrates; fraction C, a pure polyuronic acid; and fraction D, the larger part of the N of the extracts. Fraction D did not contain protein but consisted of nitrogenous acid complexes.

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