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| 150. |  | AGUIAR, R. A.; SILVEIRA, P. M. da; MOREIRA, J. A. A.; WANDER, A. E. Análise econômica da utilização de plantas de cobertura do solo e doses de nitrogênio na produtividade de milho grão. In: CONGRESSO DE PESQUISA, ENSINO E EXTENSÃO, 4., 2007, Goiânia. Ciência, educação e compromisso social: anais... Goiânia: Universidade Federal de Goiás, 2007. 1 CD-ROM.| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 151. | | PRADO, T. do S.; BRANDÃO, R. S.; LOBO JUNIOR, M.; SILVEIRA, P. M. da. Distribuição de Fusarium spp., Trichoderma spp. e Rhizoctonia solani no perfil do solo cultivado com feijoeiro comum em plantio direto e convencional. In: CONGRESSO NACIONAL DE PESQUISA DE FEIJÃO, 9., 2008, Campinas. Ciência e tecnologia na cadeia produtiva do feijão. Campinas: Instituto Agronômico, 2008. 1 CD-ROM. (IAC. Documentos, 85).| Biblioteca(s): Embrapa Arroz e Feijão. |
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| Registros recuperados : 360 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
08/12/2011 |
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Data da última atualização: |
30/03/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
RODRIGUES, C.; OLIVEIRA, V. A. de; SILVEIRA, P. M. da; SANTOS, G. G. |
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Afiliação: |
CRISTIANE RODRIGUES, Solocria Laboratório Agropecuária, Goiânia-GO; VIRLEI ÁLVARO DE OLIVEIRA, IBGE; PEDRO MARQUES DA SILVEIRA, CNPAF; GLENIO GUIMARÃES SANTOS, UNIVERSIDADE FEDERAL DO PIAUÍ. |
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Título: |
Chemical dispersants and pre-treatments to determine clay in soils with different mineralogy. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 35, n. 5, p. 1589-1596, set./out. 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
Knowledge of the soil physical properties, including the clay content, is of utmost importance for agriculture. The behavior of apparently similar soils can differ in intrinsic characteristics determined by different formation processes and nature of the parent material. The purpose of this study was to assess the efficacy of separate or combined pre-treatments, dispersion methods and chemical dispersant agents to determine clay in some soil classes, selected according to their mineralogy. Two Brazilian Oxisols, two Alfisols and one Mollisol with contrasting mineralogy were selected. Different treatments were applied: chemical substances as dispersants (lithium hydroxide, sodium hydroxide, and hexametaphosphate); pre-treatment with dithionite, ammonium oxalate, and hydrogen peroxide to eliminate organic matter; and coarse sand as abrasive and ultrasound, to test their mechanical action. The conclusion was drawn that different treatments must be applied to determine clay, in view of the soil mineralogy. Lithium hydroxide was not efficient to disperse low-CEC electropositive soils and very efficient in dispersing high-CEC electronegative soils. The use of coarse sand as an abrasive increased the clay content of all soils and in all treatments in which dispersion occurred, with or without the use of chemical dispersants. The efficiency of coarse sand is not the same for all soil classes. |
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Palavras-Chave: |
Agentes químicos; Partículas do solo. |
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Thesagro: |
Argila; Classificação do solo; Perfil do solo. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/49716/1/a13v35n5.pdf
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Marc: |
LEADER 02106naa a2200217 a 4500
001 1909025
005 2012-03-30
008 2011 bl uuuu u00u1 u #d
100 1 $aRODRIGUES, C.
245 $aChemical dispersants and pre-treatments to determine clay in soils with different mineralogy.$h[electronic resource]
260 $c2011
520 $aKnowledge of the soil physical properties, including the clay content, is of utmost importance for agriculture. The behavior of apparently similar soils can differ in intrinsic characteristics determined by different formation processes and nature of the parent material. The purpose of this study was to assess the efficacy of separate or combined pre-treatments, dispersion methods and chemical dispersant agents to determine clay in some soil classes, selected according to their mineralogy. Two Brazilian Oxisols, two Alfisols and one Mollisol with contrasting mineralogy were selected. Different treatments were applied: chemical substances as dispersants (lithium hydroxide, sodium hydroxide, and hexametaphosphate); pre-treatment with dithionite, ammonium oxalate, and hydrogen peroxide to eliminate organic matter; and coarse sand as abrasive and ultrasound, to test their mechanical action. The conclusion was drawn that different treatments must be applied to determine clay, in view of the soil mineralogy. Lithium hydroxide was not efficient to disperse low-CEC electropositive soils and very efficient in dispersing high-CEC electronegative soils. The use of coarse sand as an abrasive increased the clay content of all soils and in all treatments in which dispersion occurred, with or without the use of chemical dispersants. The efficiency of coarse sand is not the same for all soil classes.
650 $aArgila
650 $aClassificação do solo
650 $aPerfil do solo
653 $aAgentes químicos
653 $aPartículas do solo
700 1 $aOLIVEIRA, V. A. de
700 1 $aSILVEIRA, P. M. da
700 1 $aSANTOS, G. G.
773 $tRevista Brasileira de Ciência do Solo, Viçosa, MG$gv. 35, n. 5, p. 1589-1596, set./out. 2011.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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