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Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
08/12/2011 |
Data da última atualização: |
30/03/2012 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
RODRIGUES, C.; OLIVEIRA, V. A. de; SILVEIRA, P. M. da; SANTOS, G. G. |
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. |
Título: |
Chemical dispersants and pre-treatments to determine clay in soils with different mineralogy. |
Ano de publicação: |
2011 |
Fonte/Imprenta: |
Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 35, n. 5, p. 1589-1596, set./out. 2011. |
Idioma: |
Inglês |
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. |
Palavras-Chave: |
Agentes químicos; Partículas do solo. |
Thesagro: |
Argila; Classificação do solo; Perfil do solo. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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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Embrapa Arroz e Feijão (CNPAF) |
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
Data corrente: |
30/01/2020 |
Data da última atualização: |
30/01/2020 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
LEHMANN, J.; SILVA JUNIOR, J. P. da; RONDON, M.; CRAVO, M. D. S.; GREENWOOD, J.; NEHLS, T.; STEINER, C.; GLASER, B. |
Afiliação: |
JOSE PEREIRA DA SILVA JUNIOR, CPAA; MANOEL DA SILVA CRAVO, CPATU. |
Título: |
Slash-and-char: a feasible alternative for soil fertility management in the Central Amazon? |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
In: WORLD CONGRESS OF SOIL SCIENCE, 17., 2002, Bangkok, Thailand. Proceedings... [S.l.: s.n.], 2002. |
Volume: |
v. 2. |
Páginas: |
p. 439. |
Série: |
(WCSS. Symposium, 13). |
Idioma: |
Inglês |
Notas: |
Paper n. 449. |
Palavras-Chave: |
Ciclagem de nutriente. |
Thesagro: |
Cultivo Migratório; Fertilidade do Solo; Manejo do Solo. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/209970/1/17-th-wcss-bangkok-thailand-2002-abstracts-vol-ii-p439.pdf
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Marc: |
LEADER 00853nam a2200265 a 4500 001 2119633 005 2020-01-30 008 2002 bl uuuu u00u1 u #d 100 1 $aLEHMANN, J. 245 $aSlash-and-char$ba feasible alternative for soil fertility management in the Central Amazon?$h[electronic resource] 260 $aIn: WORLD CONGRESS OF SOIL SCIENCE, 17., 2002, Bangkok, Thailand. Proceedings... [S.l.: s.n.]$c2002 300 $ap. 439. v. 2. 490 $a(WCSS. Symposium, 13).$vv. 2. 500 $aPaper n. 449. 650 $aCultivo Migratório 650 $aFertilidade do Solo 650 $aManejo do Solo 653 $aCiclagem de nutriente 700 1 $aSILVA JUNIOR, J. P. da 700 1 $aRONDON, M. 700 1 $aCRAVO, M. D. S. 700 1 $aGREENWOOD, J. 700 1 $aNEHLS, T. 700 1 $aSTEINER, C. 700 1 $aGLASER, B.
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