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    Extraction and charaterization of humus with reference to clay-associated humus

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    http://hdl.handle.net/10217/80856
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    Extraction and charaterization of humus with reference to clay-associated humus (437.7Kb)
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    Abstract
    An extraction-fractionation method was developed with which it is possible to isolate 60–67% of the humus of Chernozemic and Luvisolic soils. Two humic acid fractions were obtained: (1) a conventional alkali-pyrophosphate extractable HA-A; (2) a clay-associated HA-B fraction isolated after ultrasonic dispersion, in water, of the residue of the alkali-pyrophosphate extraction. As compared to the HA-A, the HA-B fractions had lower C contents but greater N contents, narrower C:H ratios, higher molecular weights, and less resistance to hydrolysis in 6 N HCl. It was concluded that the HA-B is a weakly ...
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    Author(s)
    Anderson, D. W.; Paul, E. A.; St. Arnaud, R. J.

    Date Issued
    1974-08
    Format
    born digital; articles
    Collections
    • Faculty Publications - Department of Soil & Crop Sciences
    • Faculty Publications - Natural Resource Ecology Laboratory (NREL)
    • Paul (Eldor A.) Collection - Department of Soil & Crop Sciences
    • Paul (Eldor A.) Collection - Natural Resource Ecology Laboratory (NREL)

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