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| Registros recuperados : 44 | |
| Registros recuperados : 44 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Unidades Centrais. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
25/07/1998 |
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Data da última atualização: |
25/07/1998 |
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Autoria: |
HUTTON, E. M. |
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Afiliação: |
CPAC. |
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Título: |
Breeding and selecting leucaena for acid tropical soils. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.19, s/n, p. 263-274 jun. 1984. |
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Idioma: |
Inglês |
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Conteúdo: |
In tropical South America 55% of the area (820 million ha), including 68% of Brazil (573 million ha) comprise very acid oxisols and ultisols of pH 5 or less. Tropical Africa and Asia also have substantial areas of these acid soils. Special problems are posed by very acid soils for the growth of legumes, including N2-fixing trees like leucaena. the properties of oxisols, especially of their subsoils, have been considered as a basis for selection and breeding of leucaena lines adapted to these conditions. Perhaps the principles discussed apply also to other N2 - fixing trees. In view of the low pH, the very low exchangeable calcium and high percentage aluminium saturation in the subsoils of oxisols /ultisols), pertinent aspects of plant nutrition were reviewed. The constraints imposed on plant growth by these Ca and Al levels were given particular attention. Because of the importance of Ca in root growth, its immobility in plants and its neutralizing effect on Al, ways of increasing downward migration of Ca into the subsoil were considered. The effect of Ca on nodulation was briefly discussed. |
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Palavras-Chave: |
Fixacao de N2; N2 fixation. |
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Thesagro: |
Nodulação; Rhizobium. |
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Thesaurus NAL: |
nodulation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01603naa a2200181 a 4500
001 1104901
005 1998-07-25
008 1984 bl uuuu u00u1 u #d
100 1 $aHUTTON, E. M.
245 $aBreeding and selecting leucaena for acid tropical soils.
260 $c1984
520 $aIn tropical South America 55% of the area (820 million ha), including 68% of Brazil (573 million ha) comprise very acid oxisols and ultisols of pH 5 or less. Tropical Africa and Asia also have substantial areas of these acid soils. Special problems are posed by very acid soils for the growth of legumes, including N2-fixing trees like leucaena. the properties of oxisols, especially of their subsoils, have been considered as a basis for selection and breeding of leucaena lines adapted to these conditions. Perhaps the principles discussed apply also to other N2 - fixing trees. In view of the low pH, the very low exchangeable calcium and high percentage aluminium saturation in the subsoils of oxisols /ultisols), pertinent aspects of plant nutrition were reviewed. The constraints imposed on plant growth by these Ca and Al levels were given particular attention. Because of the importance of Ca in root growth, its immobility in plants and its neutralizing effect on Al, ways of increasing downward migration of Ca into the subsoil were considered. The effect of Ca on nodulation was briefly discussed.
650 $anodulation
650 $aNodulação
650 $aRhizobium
653 $aFixacao de N2
653 $aN2 fixation
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.19, s/n, p. 263-274 jun. 1984.
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