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| 62. |  | FREITAS, L. M. M. de; LOBATO, E.; SOARES, W. V. Experimentos de calagem, e adubação em solos sob vegetação de cerrado do Distrito Federal. Pesquisa Agropecuária Brasileira, Rio de Janeiro, v. 6, p. 81-89, 1971. (Agronomia, 4). Título em inglês: Lime fertilizer experiments on Cerrado vegetation in the Federal District.
A partir do v. 3(1968) é constituída de duas partes: Série Agronomia e Série Veterinária, publicadas também separadamente.| Biblioteca(s): Embrapa Unidades Centrais. |
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| Registros recuperados : 178 | |
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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
|
Biblioteca(s): |
Embrapa Cerrados. |
|
Data corrente: |
07/12/1998 |
|
Data da última atualização: |
07/12/1998 |
|
Autoria: |
RITCHEY, K. D.; SOUZA, D. M. G.; LOBATO, E.; CORREA, O. |
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Título: |
Calcium leaching to increase rooting depth in a Brazilian Savannah Oxisol. |
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Ano de publicação: |
1980 |
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Fonte/Imprenta: |
Agronomy Journal, Madison, v.72, p.40-44, 1980. |
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Idioma: |
Inglês |
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Conteúdo: |
Root growth in subsoils of Oxisols is often precluded because the roots of many are sensitive to soil acidity. This increases plant stress during dry periods when available soil water in the limed surface layers in exhausted. The low soil CEC and high rainfall in Central Brasil suggest that soluble calcium salts might leach below the plow layer and reduce soil acidity. To test this possibility, soil columns, simulating field profiles, were constructed in the laboratory and various Ca salts were mixed in the 0 to 15-cm layer. Addition of 1,200 mm water to 2,000 kg/ha Ca added as CaCl2 CaSO4, and CaCO3 caused Ca movement to 180, 75, and 25 cm, respectively. Calcium sulfate decreased Al saturation and increased soil pH at depth. Several field experiments were sampled to determine the effect of previous treatments on the movement of Ca + Mg. Three to four years after application of gypsum, in ordinary superphosphate, subsoil pH and Ca + Mg status were increased, and Al saturation decreased at depths as great as 75 to 90 cm. Zea mays L. roots growing in the improved subsoil environment were able to take up water and wisthstand droughts. |
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Palavras-Chave: |
Maize. |
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Thesagro: |
Calagem; Cálcio; Cerrado; Gesso; Milho; Oxisol; Solo; Zea Mays. |
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Thesaurus NAL: |
calcium; Ferralsols; gypsum; liming; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01906naa a2200325 a 4500
001 1544219
005 1998-12-07
008 1980 bl --- 0-- u #d
100 1 $aRITCHEY, K. D.
245 $aCalcium leaching to increase rooting depth in a Brazilian Savannah Oxisol.
260 $c1980
520 $aRoot growth in subsoils of Oxisols is often precluded because the roots of many are sensitive to soil acidity. This increases plant stress during dry periods when available soil water in the limed surface layers in exhausted. The low soil CEC and high rainfall in Central Brasil suggest that soluble calcium salts might leach below the plow layer and reduce soil acidity. To test this possibility, soil columns, simulating field profiles, were constructed in the laboratory and various Ca salts were mixed in the 0 to 15-cm layer. Addition of 1,200 mm water to 2,000 kg/ha Ca added as CaCl2 CaSO4, and CaCO3 caused Ca movement to 180, 75, and 25 cm, respectively. Calcium sulfate decreased Al saturation and increased soil pH at depth. Several field experiments were sampled to determine the effect of previous treatments on the movement of Ca + Mg. Three to four years after application of gypsum, in ordinary superphosphate, subsoil pH and Ca + Mg status were increased, and Al saturation decreased at depths as great as 75 to 90 cm. Zea mays L. roots growing in the improved subsoil environment were able to take up water and wisthstand droughts.
650 $acalcium
650 $aFerralsols
650 $agypsum
650 $aliming
650 $asoil
650 $aCalagem
650 $aCálcio
650 $aCerrado
650 $aGesso
650 $aMilho
650 $aOxisol
650 $aSolo
650 $aZea Mays
653 $aMaize
700 1 $aSOUZA, D. M. G.
700 1 $aLOBATO, E.
700 1 $aCORREA, O.
773 $tAgronomy Journal, Madison$gv.72, p.40-44, 1980.
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