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CitationPujola, M.; Saña, J. Effect of organic fertilizers on functional groups of humic acids in soil. A: International Humic Substances Society (IHSS). International Meeting. "6th International Meeting of the International Humic Substances Society: Humic substances in the global environment and implications on human health". Monopoli (Bari): Elsevier, 1992, p. 695-700.
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