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| 18. |  | COCHRANE, T. T.; SANCHEZ, L. G.; AZEVEDO, L. G. de; PORRAS, J. A.; GARVER, C. L. Land in tropical America: guide to climate, landscapes, and soils for agronomists in Amazonia, the Andean Peidmont, Central Brazil in Orinoco. La tierra en America Tropical. A terra na America Tropical. Cali: CIAT/EMBRAPA-CPAC, 1985. 3v. il.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 19. | | COCHRANE, T. T.; SANCHEZ, L. G.; AZEVEDO, L. G. de; PORRAS, J. A.; GARVER, C. L. Land in tropical america: a guide to climate, landscapes, and soils for agronomists in Amazonia, the Andean Piedmont, Central Brazil and Orinoco. Cali: CIAT / Planaltina: EMBRAPA-CPAC, 1985. 3v., 2pt. Contem um mapa.| Biblioteca(s): Embrapa Hortaliças. |
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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. |
|
Data corrente: |
05/02/1997 |
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Data da última atualização: |
05/02/1997 |
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Autoria: |
COCHRANE, T. T. |
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Título: |
Chemical properties of native savanna and forest soils in central Brazil. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
Soil Science Society of America Journal, v.53, p.139-141, 1989. |
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Idioma: |
Inglês |
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Conteúdo: |
Recent research of the well-drained cerrados (savanna) soils of Brazil suggests that poor root growth associated with inferior crop production is often caused by subsoil Ca deficiency rather than Al toxicity. The present study was conducted to re-examine this hypothesis and to compare native soil vegetation patterns. Horizon samples from 48 representative soils of the Geo-Economic region of Brasilia, an area covering 22-million hectares of central Brazil, were analyzed for NH4NO3 exchangeable cations, and cation and anion exchange capacity. Thirty eight of these soils were found under cerrados and 10 under the minor inclusions of native forests scattered throughout the predominantly savanna landscape. Calcium deficient soil conditions were only found in cerrados, although cerrados also occurred on high Ca soils. The Ca/Mg rations were significantly higher in the forest vs. cerrados soils. Low Ca/K ratios and high anion exchange capacity/cation exchange capacity AEC/CEC ratios were common in cerrados soils. The Mg/K ratios were satisfactory in most of the soils. It is concluded that the Ca/Mg ratios of the cerrados soils should be examined in an agricultural context. |
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Palavras-Chave: |
Brasil; Brasil central; Central Brazil; Chemical properties; Chemicophysical properties; Forest; Indigenous organisms; Native savanna; Planta nativa; Propriedade quimica; Savana nativa. |
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Thesagro: |
Cerrado; Floresta; Propriedade Físico-Química; Solo Florestal. |
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Thesaurus NAL: |
Brazil; forest soils. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02074naa a2200325 a 4500
001 1552347
005 1997-02-05
008 1989 bl --- 0-- u #d
100 1 $aCOCHRANE, T. T.
245 $aChemical properties of native savanna and forest soils in central Brazil.
260 $c1989
520 $aRecent research of the well-drained cerrados (savanna) soils of Brazil suggests that poor root growth associated with inferior crop production is often caused by subsoil Ca deficiency rather than Al toxicity. The present study was conducted to re-examine this hypothesis and to compare native soil vegetation patterns. Horizon samples from 48 representative soils of the Geo-Economic region of Brasilia, an area covering 22-million hectares of central Brazil, were analyzed for NH4NO3 exchangeable cations, and cation and anion exchange capacity. Thirty eight of these soils were found under cerrados and 10 under the minor inclusions of native forests scattered throughout the predominantly savanna landscape. Calcium deficient soil conditions were only found in cerrados, although cerrados also occurred on high Ca soils. The Ca/Mg rations were significantly higher in the forest vs. cerrados soils. Low Ca/K ratios and high anion exchange capacity/cation exchange capacity AEC/CEC ratios were common in cerrados soils. The Mg/K ratios were satisfactory in most of the soils. It is concluded that the Ca/Mg ratios of the cerrados soils should be examined in an agricultural context.
650 $aBrazil
650 $aforest soils
650 $aCerrado
650 $aFloresta
650 $aPropriedade Físico-Química
650 $aSolo Florestal
653 $aBrasil
653 $aBrasil central
653 $aCentral Brazil
653 $aChemical properties
653 $aChemicophysical properties
653 $aForest
653 $aIndigenous organisms
653 $aNative savanna
653 $aPlanta nativa
653 $aPropriedade quimica
653 $aSavana nativa
773 $tSoil Science Society of America Journal$gv.53, p.139-141, 1989.
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