Data/hora: 04/06/2024 08:07:24

Biblioteca(s): | Embrapa Cerrados; Embrapa Meio Ambiente; Embrapa Unidades Centrais.
Data corrente: | 14/01/2008
Data da última atualização: | 25/03/2014
Autoria: | PIRES, A. M. M.; MARCHI, G.; MATTIAZZO, M. E.; GUILHERME, L. R. G.
Afiliação: | Adriana Marlene Moreno Pires, Embrapa Meio Ambiente; Giuliano Marchi, Embrapa Cerrados; Maria Emília Mattiazzo, Departamento de Química-ESALQ-USP; Luiz Roberto Guimarães Guilherme, Departamento de Ciência do Solo-UFV.
Título: | Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements.
Ano de publicação: | 2007
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 42, n. 7, p. 917-924, 2007.
Idioma: | Inglês
Conteúdo: | 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.
Palavras-Chave: | availability; biosolid; biossólido; disponibilidade; exsudatos; exudates; metais pesados.
Thesagro: | Ácido Orgânico; Adubo de Esgoto; Exsudato; Lodo Residual; Metal Pesado; Solo.
Thesaurus Nal: | heavy metals.
Categoria do assunto: | --

URL:

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/100088/1/2007AP-026.pdf
http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/41093/1/42n07a02.pdf

Registro original: | Embrapa Meio Ambiente (CNPMA)

Exemplares:

CNPMA - (7157-1) - UPC - AP - -- - Aq5 G2 - PAT 2007 - 2008.00011 - DIS
AI-SEDE - (41093-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS
CPAC - (28081-1) - UPC - AP - -- - CRI7137 -  - CRI7137 - DIS