Humic fractions of organic wastes |
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Authors: | R Riffaldi |
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Institution: | Institute of Agricultural Chemistry, University of Viterbo, via Riello, 01100 Viterbo Italy;Institute of Agricultural Chemistry, University of Pisa, via S. Michele degli Scalzi 2, 56100 Pisa Italy |
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Abstract: | The distribution and composition of humic and fulvic acids have been investigated in the following organic wastes: straw, farmyard manure, sewage sludge, poultry manure, municipal refuse compost and pig slurry. Of the total organic carbon, the proportion present as humic carbon varied from about 13% in the compost to 50% in the pig slurry; the humic compounds extracted are characterized by a variable chemical composition. As compared to the natural humic substances from soil organic matter, these compounds show a lower content of acidic functional groups, lower E4/E6 and C/H ratios and can be classified as young forms of humic substances. |
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