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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
05/09/1996 |
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Data da última atualização: |
06/02/2019 |
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Autoria: |
LILIENFEIN, J.; FREIBAUER, A.; NEUFELDT, H.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; RESCK, D. V. S.; ZECH, W. |
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Título: |
Influence of land-use on the distribution of water stable aggregates and P status of sandy and clayey cerrado oxisols, Brazil. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: SIMPOSIO SOBRE O CERRADO, 8.; INTERNATIONAL SYMPOSIUM ON TROPICAL SAVANNAS, 1., 1996, Brasilia, DF. Biodiversidade e producao sustentavel de alimentos e fibras nos Cerrados: anais... Planaltina: EMBRAPA-CPAC, 1996. |
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Páginas: |
p.323-328. |
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Idioma: |
Inglês |
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Conteúdo: |
Aggregate fractionation and a modified Hedley P fractionation were used to study the effects of land-use (conventional tillage and pasture in comparison to savanna) on bulk soil and macroaggregate fractions of a sandy and a clayey Cerrado Oxisol of Brazil. The size distribution of water-stable aggregates under native Cerrado savanna is similar in the sandy and clayey soil. The large macroaggregate fraction (2-8 mm) is depleted under crop by 75% and 30% in the sandy and the clayey soil, respectively. Large macroaggregates are enriched in organic P relative to bulk soil only in the sandy Oxisol. In the clayey soil total P concentrations are three times higher than in the sandy soil. In both soils the most important P fractions are stable Fe associated inorganic P and organic P in savanna and pasture, but Al associated inorganic P form crops.Tthe absolute concentrations of organic P are higher for crop than for savanna and pasture soils, but the proportion of organic P to plant available P is reduced. After ten years of conventional tillage, aggregation and P status of the clayey Oxisol do not indicate strong degradation as small differences were encountered between the management systems. For the sandy crop a soil organic matter conserving management system is recomended to reduce aggregate disruption and depledtion of formerly protected P fractions. |
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Palavras-Chave: |
BIBJICACPAC; Brasil. |
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Thesagro: |
Cerrado; Fósforo; Fração do Solo; Latossolo; Manejo do Solo; Pastagem; Solo Arenoso; Solo Argiloso; Uso da Terra. |
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Thesaurus Nal: |
Brazil; clay soils; Ferralsols; land use; pastures; phosphorus; sandy soils; soil management. |
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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/192136/1/ID08787-CRI4014-web.pdf
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Marc: |
LEADER 02691naa a2200445 a 4500
001 1551864
005 2019-02-06
008 1996 bl uuuu u00u1 u #d
100 1 $aLILIENFEIN, J.
245 $aInfluence of land-use on the distribution of water stable aggregates and P status of sandy and clayey cerrado oxisols, Brazil.
260 $c1996
300 $ap.323-328.
520 $aAggregate fractionation and a modified Hedley P fractionation were used to study the effects of land-use (conventional tillage and pasture in comparison to savanna) on bulk soil and macroaggregate fractions of a sandy and a clayey Cerrado Oxisol of Brazil. The size distribution of water-stable aggregates under native Cerrado savanna is similar in the sandy and clayey soil. The large macroaggregate fraction (2-8 mm) is depleted under crop by 75% and 30% in the sandy and the clayey soil, respectively. Large macroaggregates are enriched in organic P relative to bulk soil only in the sandy Oxisol. In the clayey soil total P concentrations are three times higher than in the sandy soil. In both soils the most important P fractions are stable Fe associated inorganic P and organic P in savanna and pasture, but Al associated inorganic P form crops.Tthe absolute concentrations of organic P are higher for crop than for savanna and pasture soils, but the proportion of organic P to plant available P is reduced. After ten years of conventional tillage, aggregation and P status of the clayey Oxisol do not indicate strong degradation as small differences were encountered between the management systems. For the sandy crop a soil organic matter conserving management system is recomended to reduce aggregate disruption and depledtion of formerly protected P fractions.
650 $aBrazil
650 $aclay soils
650 $aFerralsols
650 $aland use
650 $apastures
650 $aphosphorus
650 $asandy soils
650 $asoil management
650 $aCerrado
650 $aFósforo
650 $aFração do Solo
650 $aLatossolo
650 $aManejo do Solo
650 $aPastagem
650 $aSolo Arenoso
650 $aSolo Argiloso
650 $aUso da Terra
653 $aBIBJICACPAC
653 $aBrasil
700 1 $aFREIBAUER, A.
700 1 $aNEUFELDT, H.
700 1 $aWESTERHOF, R.
700 1 $aAYARZA, M. A.
700 1 $aSILVA, J. E. da
700 1 $aRESCK, D. V. S.
700 1 $aZECH, W.
773 $tIn: SIMPOSIO SOBRE O CERRADO, 8.; INTERNATIONAL SYMPOSIUM ON TROPICAL SAVANNAS, 1., 1996, Brasilia, DF. Biodiversidade e producao sustentavel de alimentos e fibras nos Cerrados: anais... Planaltina: EMBRAPA-CPAC, 1996.
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Registro original: |
Embrapa Cerrados (CPAC) |
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