| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements
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| Autores: |
Pires,Adriana Marlene Moreno
Marchi,Giuliano
Mattiazzo,Maria Emília
Guilherme,Luiz Roberto Guimarães
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| Data: |
2007-07-01
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| Ano: |
2007
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| Palavras-chave: |
Biosolid
Exudates
Heavy metals
Availability
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| 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000700002
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/S0100-204X2007000700002
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.42 n.7 2007
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| Direitos: |
info:eu-repo/semantics/openAccess
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