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11. | | FARIA, S. M. DE; SPRENT, J. I. Legume nodule development, a evolutionary hypothesis. In: INTERNATIONAL LEGUME CONFERENCE, 3, Kew, 1992. Abstracts... Kew : Royal Botanie Gardens, 1992. p.9., v., p.-, 1992. Biblioteca(s): Embrapa Agrobiologia. |
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Registros recuperados : 373 | |
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Registro Completo
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
10/06/1999 |
Data da última atualização: |
10/06/1999 |
Autoria: |
FRANCO, A. A.; FARIA, S. M. de. |
Título: |
The contribution of N2-fixing tree legumes to land reclamation and sustainability in the tropics. |
Ano de publicação: |
1997 |
Fonte/Imprenta: |
Soil Biology and Biochemistry, Oxford, v. 29, n. 5/6, p. 897-903, 1997. |
Idioma: |
Inglês |
Conteúdo: |
Biodiversity, nutrient cycling and energy flux are the bases for sustainability of any system. Among the essential nutrients for plant growth, N is the most expensive and energy-consuming, and potentially is an environmental pollutant. Mixed crops with N2-fixing trees (NFTs) have been thought to maintain biodiversity and sustainability of systems in the tropics. However, most of the empirical knowledge and scientific research done with NFTs have taken for granted that all legume species nodulate and fix N under field conditions without inoculation or without supplementing phosphorus, the most common limiting essential nutrient for legumes in the tropics. In the last few years, surveys on nodulation of legume tree species and selection of highly efficient rhizobial strains for legume trees have received more attention. More than 600 species have been observed for their nodulation status in Brazil and from their nodules approximately 2400 rhizobial strains have been isolated. From 44 legume species with potential uses in the different agrosystems, efficient N2-fixing rhizobia have been selected and are available for inoculant production. New species of rhizobia or Bradyrhizobia have been described and large collections of isolates are being developed. Useful legume tree species may contribute around 12 tons of dry litter and 190 kg of N ha-1 y-1 to renovate degraded soil. These studies have prompted use of nodulated and mycorrhizal legume trees to revegetate poor or depleted soils with the goal of restoring their fertility. Experiments with native and introduced legume tree species have been successful in revegetating exposed subsoil, open mining areas and acidic residues from bauxite mining without addition of organic soil. However, supplements of rock phosphate, gypsum, micronutrients and potassium are required. MenosBiodiversity, nutrient cycling and energy flux are the bases for sustainability of any system. Among the essential nutrients for plant growth, N is the most expensive and energy-consuming, and potentially is an environmental pollutant. Mixed crops with N2-fixing trees (NFTs) have been thought to maintain biodiversity and sustainability of systems in the tropics. However, most of the empirical knowledge and scientific research done with NFTs have taken for granted that all legume species nodulate and fix N under field conditions without inoculation or without supplementing phosphorus, the most common limiting essential nutrient for legumes in the tropics. In the last few years, surveys on nodulation of legume tree species and selection of highly efficient rhizobial strains for legume trees have received more attention. More than 600 species have been observed for their nodulation status in Brazil and from their nodules approximately 2400 rhizobial strains have been isolated. From 44 legume species with potential uses in the different agrosystems, efficient N2-fixing rhizobia have been selected and are available for inoculant production. New species of rhizobia or Bradyrhizobia have been described and large collections of isolates are being developed. Useful legume tree species may contribute around 12 tons of dry litter and 190 kg of N ha-1 y-1 to renovate degraded soil. These studies have prompted use of nodulated and mycorrhizal legume trees to revegetate poor or depleted s... Mostrar Tudo |
Palavras-Chave: |
BNF; FBN; Fixacao biologica de nitrogenio; Nitrogen fixing bacteria; Root nodulation; Sustainability; Tropical soils\t\t. |
Thesagro: |
Agricultura Sustentável; Árvore; Leguminosa; Leguminosae; Micorriza; Nodulação; Solo Tropical. |
Thesaurus NAL: |
mycorrhizae; trees. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02748naa a2200325 a 4500 001 1621093 005 1999-06-10 008 1997 bl uuuu u00u1 u #d 100 1 $aFRANCO, A. A. 245 $aThe contribution of N2-fixing tree legumes to land reclamation and sustainability in the tropics. 260 $c1997 520 $aBiodiversity, nutrient cycling and energy flux are the bases for sustainability of any system. Among the essential nutrients for plant growth, N is the most expensive and energy-consuming, and potentially is an environmental pollutant. Mixed crops with N2-fixing trees (NFTs) have been thought to maintain biodiversity and sustainability of systems in the tropics. However, most of the empirical knowledge and scientific research done with NFTs have taken for granted that all legume species nodulate and fix N under field conditions without inoculation or without supplementing phosphorus, the most common limiting essential nutrient for legumes in the tropics. In the last few years, surveys on nodulation of legume tree species and selection of highly efficient rhizobial strains for legume trees have received more attention. More than 600 species have been observed for their nodulation status in Brazil and from their nodules approximately 2400 rhizobial strains have been isolated. From 44 legume species with potential uses in the different agrosystems, efficient N2-fixing rhizobia have been selected and are available for inoculant production. New species of rhizobia or Bradyrhizobia have been described and large collections of isolates are being developed. Useful legume tree species may contribute around 12 tons of dry litter and 190 kg of N ha-1 y-1 to renovate degraded soil. These studies have prompted use of nodulated and mycorrhizal legume trees to revegetate poor or depleted soils with the goal of restoring their fertility. Experiments with native and introduced legume tree species have been successful in revegetating exposed subsoil, open mining areas and acidic residues from bauxite mining without addition of organic soil. However, supplements of rock phosphate, gypsum, micronutrients and potassium are required. 650 $amycorrhizae 650 $atrees 650 $aAgricultura Sustentável 650 $aÁrvore 650 $aLeguminosa 650 $aLeguminosae 650 $aMicorriza 650 $aNodulação 650 $aSolo Tropical 653 $aBNF 653 $aFBN 653 $aFixacao biologica de nitrogenio 653 $aNitrogen fixing bacteria 653 $aRoot nodulation 653 $aSustainability 653 $aTropical soils\t\t 700 1 $aFARIA, S. M. de 773 $tSoil Biology and Biochemistry, Oxford$gv. 29, n. 5/6, p. 897-903, 1997.
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