Changes in the composition and properties of humic acids under the influence of microorganisms |
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| Authors: | I V Chistyakov S Ya Trofimov L V Lysak A A Stepanov |
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| Institution: | 14142. Department of Soil Science, Moscow State University, Moscow, 119991, Russia
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| Abstract: | By gel filtration on Sephadex G-50 and G-75, we investigated the changes in the composition and ratio of the molecular fractions of humic acids under the influence of native soil microbial complexes. The highest degree of decomposition of the initial humic acid was observed when ammonium nitrate was used as a source of additional energy in the mineral nutrient medium without a yeast extract. The appearance of a low molecular fraction of organic substances on chromatograms may be associated with the synthesis by bacteria of simple organic substances on the medium with humic acids as a single source of carbon. |
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