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Registro Completo |
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Biblioteca(s): |
Embrapa Amapá; Embrapa Florestas. |
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Data corrente: |
14/02/2002 |
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Data da última atualização: |
04/08/2014 |
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Autoria: |
OLIVEIRA, M. A. J. de; BOVI, M. L. A.; MACHADO, E. C.; GOMES, M. M. de A.; HABERMANN, G.; RODRIGUES, J. D. |
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Título: |
Fotossintese, condutancia estomatica e transpiracao em pupunheira sob deficiencia hidrica. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Scientia Agricola, Piracicaba, v. 59, n. 1, p. 59-63, jan./mar. 2002. |
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Idioma: |
Português |
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Conteúdo: |
Resultados de pesquisa envolvendo aspectos fisiologicos da pupunheira (Bactris gasipaes Kunth), fruteira nativa da America Tropical, sao escassos. Procurando completar essa lacuna, um experimento sob deficiencia hidrica foi conduzido em casa de vegetacao, durante um periodo de 13 dias, utilizando plantas de 12 meses de idade. O objetivo principal foi avaliar as respostas da pupunheira a deficiencia hidrica. As variaveis observadas foram: taxa de assimilicao de CO2, transpiracao, condutancia estomatica e potencial de agua das folhas. As coletas dos dados foram realizdas diariamente em laboratorio e sob fluxo de 1200 um-2S-1. Os resultados foram submetidos a analise de varianca e de regressao. Verificou-se decrescimo no potencial de agua da folha e nas trocas gasosas quando a irrigacao foi interrompida por mais de seis dias. Valores minimos foram obtidos no decimo dia, com reducao de 92% da fotossintese liquida, 87% da condutancia estomatica e 70% da transpiracao. O menor potencial de agua nas folhas (-1,9 MPa) foi tambem observado nesse periodo. Houve recuperacao total de todas as variaveis dois dias apois reirrigacao, com excecao da que a queda na fotossintese, indicam a existencia de mecanismos de aclimatacao em pupunheira, no sentido de diminuir as perdas de agua, quando sob condicao de estresse hidrico moderado. |
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Palavras-Chave: |
Water deficit. |
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Thesagro: |
Bactris Gasipaes; Deficiência Hídrica; Fotossíntese; Pupunha. |
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Thesaurus Nal: |
photosynthesis. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02073naa a2200253 a 4500
001 1280891
005 2014-08-04
008 2002 bl uuuu u00u1 u #d
100 1 $aOLIVEIRA, M. A. J. de
245 $aFotossintese, condutancia estomatica e transpiracao em pupunheira sob deficiencia hidrica.
260 $c2002
520 $aResultados de pesquisa envolvendo aspectos fisiologicos da pupunheira (Bactris gasipaes Kunth), fruteira nativa da America Tropical, sao escassos. Procurando completar essa lacuna, um experimento sob deficiencia hidrica foi conduzido em casa de vegetacao, durante um periodo de 13 dias, utilizando plantas de 12 meses de idade. O objetivo principal foi avaliar as respostas da pupunheira a deficiencia hidrica. As variaveis observadas foram: taxa de assimilicao de CO2, transpiracao, condutancia estomatica e potencial de agua das folhas. As coletas dos dados foram realizdas diariamente em laboratorio e sob fluxo de 1200 um-2S-1. Os resultados foram submetidos a analise de varianca e de regressao. Verificou-se decrescimo no potencial de agua da folha e nas trocas gasosas quando a irrigacao foi interrompida por mais de seis dias. Valores minimos foram obtidos no decimo dia, com reducao de 92% da fotossintese liquida, 87% da condutancia estomatica e 70% da transpiracao. O menor potencial de agua nas folhas (-1,9 MPa) foi tambem observado nesse periodo. Houve recuperacao total de todas as variaveis dois dias apois reirrigacao, com excecao da que a queda na fotossintese, indicam a existencia de mecanismos de aclimatacao em pupunheira, no sentido de diminuir as perdas de agua, quando sob condicao de estresse hidrico moderado.
650 $aphotosynthesis
650 $aBactris Gasipaes
650 $aDeficiência Hídrica
650 $aFotossíntese
650 $aPupunha
653 $aWater deficit
700 1 $aBOVI, M. L. A.
700 1 $aMACHADO, E. C.
700 1 $aGOMES, M. M. de A.
700 1 $aHABERMANN, G.
700 1 $aRODRIGUES, J. D.
773 $tScientia Agricola, Piracicaba$gv. 59, n. 1, p. 59-63, jan./mar. 2002.
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Registro original: |
Embrapa Florestas (CNPF) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
08/01/2024 |
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Data da última atualização: |
08/01/2024 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
OLIVEIRA, P. P. A.; PASQUINI NETO, R.; PÁDUA, G. S.; C. JUNIOR, L. H.; VECHI, R.; FURTADO, A. J.; SILVA, G. V.; LOBO, A. A.; ABDALLA FILHO, A. L.; PEDROSO, A. de F.; RODRIGUES, P. H. M. |
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Afiliação: |
PATRICIA PERONDI ANCHAO OLIVEIRA, CPPSE; ROLANDO PASQUINI NETO, University of São Paulo; G. S PÁDUA; L. H. C. JUNIOR; R. VECHI; A. J. FURTADO, University of São Paulo; G. V. SILVA, University of São Paulo; A. A. LOBO, University of São Paulo; A. L. ABDALLA-FILHO, University of São Paulo; ANDRE DE FARIA PEDROSO, CPPSE; P. H. M. RODRIGUES, University of São Paulo. |
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Título: |
Performance of finishing Nellore beef steers in intensively managed pastures and silvopastoral systems in Southeast of Brazil . |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
In: INTERNATIONAL GRASSLAND CONGRESS, 25., 2023, Kentucky. Grassland for Soil, Animal, & Human Health. Proceedings... Kentucky: Curran Associates, 2023. |
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Páginas: |
p. 1279-1282. |
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Idioma: |
Inglês |
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Conteúdo: |
This study evaluated the average daily weight gain (ADG), stocking rates, and live weight gain per hectare (LWG) in different intensified animal production systems. The experiment was carried out from September 2020 to September 2021 at Embrapa Southeast Livestock, São Carlos, SP, Brazil. Thirty Nellore steers (285+21 kg of live weight and 12+13 months old) were randomly distributed into five treatments, with two replicates: 1) intensively managed and irrigated Megathyrsus maximus cv. Tanzânia pasture overseeded in the dry season with Avena by=antina and Lolium multiflorum (IHS); 2) intensively managed rainfed M. maximus cv. Tanzânia pasture (RHS); 3) intensively managed rainfed pasture with a mix of Urochloa decumbens cv. Basilisk and U. brizantha cv. Marandu (RMS); 4) intensively managed silvopastoral system with U. decumbens cv. Basilisk and Brazilian native trees (312 trees ha) (LFS); and 5) extensively managed degraded pasture of U. brizantha cv. Marandu and U. decumbens cv. Basilisk (DP). Data were submitted to analysis of variance considering treatments and seasons as fixed effects, and the interaction between treatmentxseason was tested. Means were compared by the Fisher test at 5% using the PROC MIXED of SAS. For all parameters, significant interaction was found (P<.0001). In general, higher ADG, stocking rate and LWG values were found for IHS (0.82 kg d, 6.03 AU ha' and 459.9 kg ha™, respectively), while the lowest values were found for DP (0.33 kg d'); for LFS (1.16 AU ha™); and for LFS and DP (71.0 and 68.9 kg ha™, respectively). It is important to consider that for LFS the competition for natural resources between the system components (pasture and trees) together with low temperatures and soil moisture during the autumn and winter seasons may explain the unexpected low performances. Overall, our results showed that more intensified systems allowed better animal performances when compared to DP. MenosThis study evaluated the average daily weight gain (ADG), stocking rates, and live weight gain per hectare (LWG) in different intensified animal production systems. The experiment was carried out from September 2020 to September 2021 at Embrapa Southeast Livestock, São Carlos, SP, Brazil. Thirty Nellore steers (285+21 kg of live weight and 12+13 months old) were randomly distributed into five treatments, with two replicates: 1) intensively managed and irrigated Megathyrsus maximus cv. Tanzânia pasture overseeded in the dry season with Avena by=antina and Lolium multiflorum (IHS); 2) intensively managed rainfed M. maximus cv. Tanzânia pasture (RHS); 3) intensively managed rainfed pasture with a mix of Urochloa decumbens cv. Basilisk and U. brizantha cv. Marandu (RMS); 4) intensively managed silvopastoral system with U. decumbens cv. Basilisk and Brazilian native trees (312 trees ha) (LFS); and 5) extensively managed degraded pasture of U. brizantha cv. Marandu and U. decumbens cv. Basilisk (DP). Data were submitted to analysis of variance considering treatments and seasons as fixed effects, and the interaction between treatmentxseason was tested. Means were compared by the Fisher test at 5% using the PROC MIXED of SAS. For all parameters, significant interaction was found (P<.0001). In general, higher ADG, stocking rate and LWG values were found for IHS (0.82 kg d, 6.03 AU ha' and 459.9 kg ha™, respectively), while the lowest values were found for DP (0.33 kg d'); for LFS (1.... Mostrar Tudo |
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Palavras-Chave: |
Grazing systems; Intensification; Sustainability. |
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Thesaurus NAL: |
Animal performance; Stocking rate. |
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Categoria do assunto: |
A Sistemas de Cultivo |
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Marc: |
LEADER 02969nam a2200301 a 4500
001 2160512
005 2024-01-08
008 2023 bl uuuu u00u1 u #d
100 1 $aOLIVEIRA, P. P. A.
245 $aPerformance of finishing Nellore beef steers in intensively managed pastures and silvopastoral systems in Southeast of Brazil .$h[electronic resource]
260 $aIn: INTERNATIONAL GRASSLAND CONGRESS, 25., 2023, Kentucky. Grassland for Soil, Animal, & Human Health. Proceedings... Kentucky: Curran Associates$c2023
300 $ap. 1279-1282.
520 $aThis study evaluated the average daily weight gain (ADG), stocking rates, and live weight gain per hectare (LWG) in different intensified animal production systems. The experiment was carried out from September 2020 to September 2021 at Embrapa Southeast Livestock, São Carlos, SP, Brazil. Thirty Nellore steers (285+21 kg of live weight and 12+13 months old) were randomly distributed into five treatments, with two replicates: 1) intensively managed and irrigated Megathyrsus maximus cv. Tanzânia pasture overseeded in the dry season with Avena by=antina and Lolium multiflorum (IHS); 2) intensively managed rainfed M. maximus cv. Tanzânia pasture (RHS); 3) intensively managed rainfed pasture with a mix of Urochloa decumbens cv. Basilisk and U. brizantha cv. Marandu (RMS); 4) intensively managed silvopastoral system with U. decumbens cv. Basilisk and Brazilian native trees (312 trees ha) (LFS); and 5) extensively managed degraded pasture of U. brizantha cv. Marandu and U. decumbens cv. Basilisk (DP). Data were submitted to analysis of variance considering treatments and seasons as fixed effects, and the interaction between treatmentxseason was tested. Means were compared by the Fisher test at 5% using the PROC MIXED of SAS. For all parameters, significant interaction was found (P<.0001). In general, higher ADG, stocking rate and LWG values were found for IHS (0.82 kg d, 6.03 AU ha' and 459.9 kg ha™, respectively), while the lowest values were found for DP (0.33 kg d'); for LFS (1.16 AU ha™); and for LFS and DP (71.0 and 68.9 kg ha™, respectively). It is important to consider that for LFS the competition for natural resources between the system components (pasture and trees) together with low temperatures and soil moisture during the autumn and winter seasons may explain the unexpected low performances. Overall, our results showed that more intensified systems allowed better animal performances when compared to DP.
650 $aAnimal performance
650 $aStocking rate
653 $aGrazing systems
653 $aIntensification
653 $aSustainability
700 1 $aPASQUINI NETO, R.
700 1 $aPÁDUA, G. S.
700 1 $aC. JUNIOR, L. H.
700 1 $aVECHI, R.
700 1 $aFURTADO, A. J.
700 1 $aSILVA, G. V.
700 1 $aLOBO, A. A.
700 1 $aABDALLA FILHO, A. L.
700 1 $aPEDROSO, A. de F.
700 1 $aRODRIGUES, P. H. M.
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