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Provedor de dados:  PAB
País:  Brazil
Título:  Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements
Autores:  Pires,Adriana Marlene Moreno
Mattiazzo,Maria Emília
Guilherme,Luiz Roberto Guimarães
Data:  2007-07-01
Ano:  2007
Palavras-chave:  Biosolid
Heavy metals
Resumo:  The aim of this work was to quantify low molecular weight organic acids in the rhizosphere of plants grown in a sewage sludge-treated media, and to assess the correlation between the release of the acids and the concentrations of trace-elements in the shoots of the plants. The species utilized in the experiment were cultivated in sand and sewage sludge-treated sand. The acetic, citric, lactic, and oxalic acids, were identified and quantified by high performance liquid chromatography in samples collected from a hydroponics system. Averages obtained from each treatment, concentration of trace elements in shoots and concentration of organic acids in the rhizosphere, were compared by Tukey test, at 5% of probability. Linear correlation analysis was applied to verify an association between the concentrations of organic acids and of trace elements. The average composition of organic acids for all plants was: 43.2, 31.1, 20.4 and 5.3% for acetic, citric, lactic, and oxalic acids, respectively. All organic acids evaluated, except for the citric acid, showed a close statistical agreement with the concentrations of Cd, Cu, Ni, and Zn found in the shoots. There is a positive relationship between organic acids present in the rhizosphere and trace element phytoavailability.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira
Relação:  10.1590/S0100-204X2007000700002
Formato:  text/html
Fonte:  Pesquisa Agropecuária Brasileira v.42 n.7 2007
Direitos:  info:eu-repo/semantics/openAccess

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