Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/46465
Title: UV-visible Spectroscopy as a New Tool to Predict the Bioactivity of Humic Fragments Induced by Citric/ Oxalic Acids on Eucalyptus Nutrition and Growth
Keywords: HA supramolecular structure
Humic acid fragmentation
Bioactivity prediction
Dry matter - Production
Espectroscopia no ultravioleta visível
Eucalipto - Crescimento
Eucalipto - Nutrição
Ácido cítrico
Ácido oxálico
Ácido húmico
Matéria seca - Produção
Issue Date: Nov-2020
Publisher: Taylor & Francis Online
Citation: MORAIS, E.; SILVA, C. A.; MALUF, H. J. G. M. UV-visible Spectroscopy as a New Tool to Predict the Bioactivity of Humic Fragments Induced by Citric/ Oxalic Acids on Eucalyptus Nutrition and Growth. Communications in Soil Science and Plant Analysis, London, v. 51, n. 22, p. 2830-2845, 2020. DOI: https://doi.org/10.1080/00103624.2020.1849266.
Abstract: Citric (CA) and oxalic (OA) acids are able to change the humic acid (HA) supramolecular structure, affecting HA effects on plants. This study aimed to evaluate the effect of CA and OA on HA supramolecular structure changes, and how these changes influence the eucalyptus growth and nutrition. HA was combined or not with CA and OA, as follows: HA+CA+OA; HA+CA; HA+OA; HA; CA+OA; CA, OA and control (no HA, CA, and OA). Seedlings were grown in a nutrient solution for 45 days. It was determined the dry matter production, the nutrients contained in the nutrient solution, and their accumulation by eucalyptus. Changes in the HA supramolecular structure were evaluated through the UV-visible light absorbance ratios. Use of HA+OA increased the E4/E6 and A254/A204 ratio, and reduced the E2/E3 ratio over the exclusive use of HA, increasing the reactivity and reducing the aromaticity over intact HA. HA fragmented by OA increased the dry matter production and nutrients accumulated by eucalyptus. CA was not effective in changing the HA supramolecular structure, as well as in improving eucalyptus growth. The HA bioactivity on eucalyptus growth induced by CA and/or OA can be inferred from a new index relates to A254/A204 and E4/E6 absorbance ratio.
URI: https://doi.org/10.1080/00103624.2020.1849266
http://repositorio.ufla.br/jspui/handle/1/46465
Appears in Collections:DCA - Artigos publicados em periódicos

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