Resumo

HUELVA LOPEZ, Rafael et al. Chemical and chemistry-physical properties of derived structurals of humics acid obtained of vermicompost. Biological activity. Rev Cie Téc Agr [online]. 2013, vol.22, n.2, pp. 56-60. ISSN 2071-0054.

The chemical modification of the húmic acids (AH) can be used as a tool to understand their chemical structure, which is very complex. New results show that exists a relationship among their functions and chemical properties modified with changes in the biological activity that they manifest on the growth of the plants. Presently work chemical reactions of acetilatión, metilatión and amonificatión were used to modify the structure of those AH obtained of vermicompost of bovine manure, those that were evaluated by their content of C, coefficient E4/E6 and their acidity. In the derivatizaded and the AH not derivatizated the structural changes were analyzed by the Infrared Espectroscopy of Diffuse Reflactancy with Fourrier Transformed method (DRIFT) and through their spectra the hidrofobicity indexes (IH) and of condensation (IC) of the molecules. The results show important changes in all the studied indicators showed differences in dependence of agent's used. The results found in the bioassays for Indol Acetic Acid (AIA) showed increments in the equivalent content of the biorregulator in order to derivatizaded and higher activity that AH not derivatizated.

Palavras-chave : : humic substances; humic acids; derivatizatión; indol acetic acid.

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