Extraction and charaterization of humus with reference to clay-associated humus
| dc.contributor.author | Anderson, D. W., author | |
| dc.contributor.author | Paul, E. A., author | |
| dc.contributor.author | St. Arnaud, R. J., author | |
| dc.contributor.author | Agricultural Institute of Canada, publisher | |
| dc.date.accessioned | 2007-01-03T06:06:39Z | |
| dc.date.available | 2007-01-03T06:06:39Z | |
| dc.date.issued | 1974-08 | |
| dc.description.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 humified, potentially labile humic constituent stabilized by adsorption to clay. Spectral measurements on low-ash (< 2 %) humic acids showed a positive correlation between extinction coefficient at 280 nm (E280) and C:H ratio, and negative correlations between E280 and percent of hydrolyzable C and N. The E4:E6 ratio was related to molecular weight, as determined by agar gel filtration, increasing with decrease in molecular weight. | |
| dc.format.medium | born digital | |
| dc.format.medium | articles | |
| dc.identifier.bibliographicCitation | Anderson, D. W., E. A. Paul, and R. J. St. Arnaud, Extraction and Charaterization of Humus with Reference to Clay-Associated Humus. Canadian Journal of Soil Science 54, no. 3 (August 1974): 317-323. https://dx.doi.org/10.4141/cjss74-041. | |
| dc.identifier.doi | https://dx.doi.org/10.4141/cjss74-041 | |
| dc.identifier.uri | http://hdl.handle.net/10217/80856 | |
| dc.language | English | |
| dc.language.iso | eng | |
| dc.publisher | Colorado State University. Libraries | |
| dc.relation.ispartof | Faculty Publications | |
| dc.rights | ©1974 Agricultural Institute of Canada. | |
| dc.rights | Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. | |
| dc.subject | organic heteropolymers | |
| dc.subject | soil organic matter | |
| dc.subject | extraction-fractionation method | |
| dc.subject | humus | |
| dc.title | Extraction and charaterization of humus with reference to clay-associated humus | |
| dc.type | Text |
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