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extraction from solid sources of NOM. A newer view of humic substances is that they are not mostly high-molecular-weight macropolymers. Rather, they represent a heterogeneous mixture of relatively small molecular components of the soil organic matter auto-assembled in supramolecular associations and are composed of a variety of compounds of biological origin and synthesized by abiotic and biotic reactions in soil and surface waters. It is the large molecular complexity of the soil humeome that confers to humic matter its bioactivity in, its stability

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