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Registro Completo |
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
27/12/2000 |
Data da última atualização: |
27/12/2000 |
Autoria: |
TRANNIN, W. S.; URQUIAGA, S.; GUERRA, J. G. M.; IBIJBJEN, J.; CADISCH, G. |
Título: |
Interspecies competition and N transfer in a tropical grass-legume mixture. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
Biology and Fertility of Soils, Berlin, v. 32, n. 6, p. 441-448, 2000. |
Idioma: |
Inglês |
Conteúdo: |
Competitiveness of Brachiaria decumbens cv. Basilisk and Stylosanthes guianensis cv. Minerão was investigated either without root restriction or by separating their root systems with a fine mesh or a solid barrier in the presence or absence of mycorrhiza ( Glomus clarum ). Nitrogen transfer between the legume and the grass was assessed with the 15N isotope dilution technique using a relatively stable 15N-enriched soil derived from a long-term labelling experiment. During establishment, legume development was severely restricted by competition from the grass in pots without a root barrier. However, as the system became N limited, the legume became dominant due to its access to atmospheric N2 which contributed over 80% of the legume N requirements. S. guianensis was highly mycotrophic and inoculation with mycorrhiza favoured rapid establishment even in the treatments with no root barrier. Only in the presence of root barriers, either a mesh or a complete compartment separation, was the proportion of N derived from N2 fixation positively affected by the presence of the fungus. No significant direct belowground N transfer from legume to grass was observed during the lifetime of the legume suggesting that the legume maintains a highly efficient recycling under N-limited conditions. However, after cutting the shoot at ground leveI, the grass assimilated significant amounts of N de- rived from decaying legume roots. We conclude that the main pathway of belowground N transfer from S. guianensis to associated B. decumbens occurred via de- composing roots rather than via root exudates or direct mycorrhizal hyphae transfer. MenosCompetitiveness of Brachiaria decumbens cv. Basilisk and Stylosanthes guianensis cv. Minerão was investigated either without root restriction or by separating their root systems with a fine mesh or a solid barrier in the presence or absence of mycorrhiza ( Glomus clarum ). Nitrogen transfer between the legume and the grass was assessed with the 15N isotope dilution technique using a relatively stable 15N-enriched soil derived from a long-term labelling experiment. During establishment, legume development was severely restricted by competition from the grass in pots without a root barrier. However, as the system became N limited, the legume became dominant due to its access to atmospheric N2 which contributed over 80% of the legume N requirements. S. guianensis was highly mycotrophic and inoculation with mycorrhiza favoured rapid establishment even in the treatments with no root barrier. Only in the presence of root barriers, either a mesh or a complete compartment separation, was the proportion of N derived from N2 fixation positively affected by the presence of the fungus. No significant direct belowground N transfer from legume to grass was observed during the lifetime of the legume suggesting that the legume maintains a highly efficient recycling under N-limited conditions. However, after cutting the shoot at ground leveI, the grass assimilated significant amounts of N de- rived from decaying legume roots. We conclude that the main pathway of belowground N transfer from ... Mostrar Tudo |
Palavras-Chave: |
Arbuscular mycorrhizae vesicular; Biological nitrogen fixation; BNF; FBN; Fixação biológica de nitrogênio. |
Thesagro: |
Brachiaria Decumbens; Micorriza Vesicular Arbuscular; Stylosanthes Guianensis. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02441naa a2200265 a 4500 001 1597294 005 2000-12-27 008 2000 bl --- 0-- u #d 100 1 $aTRANNIN, W. S. 245 $aInterspecies competition and N transfer in a tropical grass-legume mixture. 260 $c2000 520 $aCompetitiveness of Brachiaria decumbens cv. Basilisk and Stylosanthes guianensis cv. Minerão was investigated either without root restriction or by separating their root systems with a fine mesh or a solid barrier in the presence or absence of mycorrhiza ( Glomus clarum ). Nitrogen transfer between the legume and the grass was assessed with the 15N isotope dilution technique using a relatively stable 15N-enriched soil derived from a long-term labelling experiment. During establishment, legume development was severely restricted by competition from the grass in pots without a root barrier. However, as the system became N limited, the legume became dominant due to its access to atmospheric N2 which contributed over 80% of the legume N requirements. S. guianensis was highly mycotrophic and inoculation with mycorrhiza favoured rapid establishment even in the treatments with no root barrier. Only in the presence of root barriers, either a mesh or a complete compartment separation, was the proportion of N derived from N2 fixation positively affected by the presence of the fungus. No significant direct belowground N transfer from legume to grass was observed during the lifetime of the legume suggesting that the legume maintains a highly efficient recycling under N-limited conditions. However, after cutting the shoot at ground leveI, the grass assimilated significant amounts of N de- rived from decaying legume roots. We conclude that the main pathway of belowground N transfer from S. guianensis to associated B. decumbens occurred via de- composing roots rather than via root exudates or direct mycorrhizal hyphae transfer. 650 $aBrachiaria Decumbens 650 $aMicorriza Vesicular Arbuscular 650 $aStylosanthes Guianensis 653 $aArbuscular mycorrhizae vesicular 653 $aBiological nitrogen fixation 653 $aBNF 653 $aFBN 653 $aFixação biológica de nitrogênio 700 1 $aURQUIAGA, S. 700 1 $aGUERRA, J. G. M. 700 1 $aIBIJBJEN, J. 700 1 $aCADISCH, G. 773 $tBiology and Fertility of Soils, Berlin$gv. 32, n. 6, p. 441-448, 2000.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
Data corrente: |
08/03/2016 |
Data da última atualização: |
08/03/2016 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
B - 2 |
Autoria: |
VINHOLIS, M. de M. B.; TOLEDO, J. C. de; SOUZA FILHO, H. M. de. |
Afiliação: |
MARCELA DE MELLO BRANDAO VINHOLIS, CPPSE; José Carlos de Toledo, UFSCar; Hildo Meirelles de Souza Filho, UFSCar. |
Título: |
Efeito dos mecanismos de redução da assimetria da informação e da incerteza da qualidade na estrutura de governança. |
Ano de publicação: |
2012 |
Fonte/Imprenta: |
Organizações Rurais & Agroindustriais, Lavras, v. 14, n. 3, p. 312-325, 2012 |
Idioma: |
Português |
Palavras-Chave: |
Certificação; Marca; Rastreabilidade; Segurança do alimento. |
Thesagro: |
Qualidade. |
Categoria do assunto: |
D Governo, Leis e Regulamentações |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/140801/1/PROCI-2012.00370.pdf
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Marc: |
LEADER 00658naa a2200193 a 4500 001 2040126 005 2016-03-08 008 2012 bl uuuu u00u1 u #d 100 1 $aVINHOLIS, M. de M. B. 245 $aEfeito dos mecanismos de redução da assimetria da informação e da incerteza da qualidade na estrutura de governança.$h[electronic resource] 260 $c2012 650 $aQualidade 653 $aCertificação 653 $aMarca 653 $aRastreabilidade 653 $aSegurança do alimento 700 1 $aTOLEDO, J. C. de 700 1 $aSOUZA FILHO, H. M. de 773 $tOrganizações Rurais & Agroindustriais, Lavras$gv. 14, n. 3, p. 312-325, 2012
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