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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
16/02/2000 |
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Data da última atualização: |
16/02/2000 |
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Autoria: |
WESTERHOF, R.; BUURMAN, P.; GRIETHUYSEN, C. van; AYARZA, M. A.; VILELA, L.; ZECH, W. |
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Título: |
Aggregation studied by laser diffraction in relation to plowing and liming in the Cerrado region in Brazil. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v.90, p.277-290, 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
In the Cerrado savanna region in Brazil, the effects of different land use on Oxisol aggregation were studied, using laser diffraction grain size analyses. The topsoil of plowed systems had significantly lower amount of macroaggrehates (2000-194 um) and a significantly higher amount of soil in the microaggregate size and and primary particle fraction (<76 um) compared to pastures and the native Cerrado. In plowed systems low in soil organic carbon (SOC), lime had a negative effect on aggregate stability. Lime addition had no effect on topsoil aggregation in land use systems that were not plowed regularly and generally had SOC content. For all the studied topsoils, pHKCl was positively correlated with the amount of clay dispersed after 3 h of shaking in water. SOC did not influence clay dispersion in the range of soils studied. In continuous cropping systems in the Cerrado region, with a combination of mechanical stress and low SOC, liming will cause an increase in small aggregates and primary particles and hence contribuite to a destabilization of the soil structure. |
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Palavras-Chave: |
Ploughing. |
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Thesagro: |
Aradura; Calagem; Cerrado; Estrutura do Solo; Matéria Orgânica. |
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Thesaurus NAL: |
liming; organic matter; soil structure. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01860naa a2200289 a 4500
001 1555057
005 2000-02-16
008 1999 bl --- 0-- u #d
100 1 $aWESTERHOF, R.
245 $aAggregation studied by laser diffraction in relation to plowing and liming in the Cerrado region in Brazil.
260 $c1999
520 $aIn the Cerrado savanna region in Brazil, the effects of different land use on Oxisol aggregation were studied, using laser diffraction grain size analyses. The topsoil of plowed systems had significantly lower amount of macroaggrehates (2000-194 um) and a significantly higher amount of soil in the microaggregate size and and primary particle fraction (<76 um) compared to pastures and the native Cerrado. In plowed systems low in soil organic carbon (SOC), lime had a negative effect on aggregate stability. Lime addition had no effect on topsoil aggregation in land use systems that were not plowed regularly and generally had SOC content. For all the studied topsoils, pHKCl was positively correlated with the amount of clay dispersed after 3 h of shaking in water. SOC did not influence clay dispersion in the range of soils studied. In continuous cropping systems in the Cerrado region, with a combination of mechanical stress and low SOC, liming will cause an increase in small aggregates and primary particles and hence contribuite to a destabilization of the soil structure.
650 $aliming
650 $aorganic matter
650 $asoil structure
650 $aAradura
650 $aCalagem
650 $aCerrado
650 $aEstrutura do Solo
650 $aMatéria Orgânica
653 $aPloughing
700 1 $aBUURMAN, P.
700 1 $aGRIETHUYSEN, C. van
700 1 $aAYARZA, M. A.
700 1 $aVILELA, L.
700 1 $aZECH, W.
773 $tGeoderma, Amsterdam$gv.90, p.277-290, 1999.
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