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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agricultura Digital. Para informações adicionais entre em contato com cnptia.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
16/02/2009 |
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Data da última atualização: |
15/01/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
RIGHI, E. Z.; ANGELOCCI, L. R.; MARIN, F. R. |
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Afiliação: |
EVANDRO ZANINI RIGHI, PUC-PR; LUIZ ROBERTO ANGELOCCI, Esalq/USP; FABIO RICARDO MARIN, CNPTIA. |
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Título: |
Energy balance of a young drip-irrigated coffee crop in southeast Brazil: an analysis of errors and reliability of measurements by the Bowen ratio method. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Revista Brasileira de Agrometeorologia, Piracicaba, v. 15, n. 3, p. 267-279, 2007. |
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Idioma: |
Inglês |
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Conteúdo: |
The energy balance of a young (one to two year-old), drip irrigated coffee crop in hedgerows configuration was determined using the energy balance-Bowen ratio (EBBR) method, during two periods in the wet season [October?Dezember/2002 (P1) and February?March/2003 (P2)] and two in the dry season [May?July/2003 (P3) and August?September/2003 (P4)], in Piracicaba, São Paulo State, Brazil. An analysis of errors affecting the estimates of latent and sensible heat fluxes was performed. Emphasis was given on determining the reliability of the assumption that Kh=Kw in the EBBR method, in view of the possibility of occurrence of sensible heat advection (regional and or within-row) and on the effect of errors of measurements of the air temperature and vapor pressure through the use of thermocouple psychrometers. The psychrometric errors had a more prevalent effect in the dry periods when the humidity gradients were lower than during the humid periods, leading to a larger discarding of measurement during P3 and P4. In the wet periods, it was deduced that the assumption of Kh=Kw did not introduce a large effect on the estimates of the heat fluxes, but during the dry periods this similarity could not be assumed as a function of advective fluxes. The soil surface water conditions were the main factor that determined the energy partitioning. The latent heat flux represented more than 80% of the available energy (Rn?G) in the wet season, decreasing to 78% in P3 and 64% in P4, the dry periods. However, values obtained during P4 were affected by problems on management of the coffee crop. Weeds growing in the inter-rows affected the energy partitioning mostly during periods with low rainfall. The effect of coffee growth and the weeds on the latent heat flux was masked by the soil humidity inside each studied period. In the early dry period, the effect of inter-row weeds on the latent heat flux was important, because they could have extracted water from deep depths in the soil. MenosThe energy balance of a young (one to two year-old), drip irrigated coffee crop in hedgerows configuration was determined using the energy balance-Bowen ratio (EBBR) method, during two periods in the wet season [October?Dezember/2002 (P1) and February?March/2003 (P2)] and two in the dry season [May?July/2003 (P3) and August?September/2003 (P4)], in Piracicaba, São Paulo State, Brazil. An analysis of errors affecting the estimates of latent and sensible heat fluxes was performed. Emphasis was given on determining the reliability of the assumption that Kh=Kw in the EBBR method, in view of the possibility of occurrence of sensible heat advection (regional and or within-row) and on the effect of errors of measurements of the air temperature and vapor pressure through the use of thermocouple psychrometers. The psychrometric errors had a more prevalent effect in the dry periods when the humidity gradients were lower than during the humid periods, leading to a larger discarding of measurement during P3 and P4. In the wet periods, it was deduced that the assumption of Kh=Kw did not introduce a large effect on the estimates of the heat fluxes, but during the dry periods this similarity could not be assumed as a function of advective fluxes. The soil surface water conditions were the main factor that determined the energy partitioning. The latent heat flux represented more than 80% of the available energy (Rn?G) in the wet season, decreasing to 78% in P3 and 64% in P4, the dry periods... Mostrar Tudo |
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Palavras-Chave: |
Advecção; Calor sensível; Erros de medidas; Fluxo de energia latente; Psicrometria; Psychrometry. |
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Thesagro: |
Balanço de energia; Café; Clima; Irrigação. |
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Thesaurus Nal: |
advection. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02861naa a2200277 a 4500
001 1024586
005 2020-01-15
008 2007 bl uuuu u00u1 u #d
100 1 $aRIGHI, E. Z.
245 $aEnergy balance of a young drip-irrigated coffee crop in southeast Brazil$ban analysis of errors and reliability of measurements by the Bowen ratio method.$h[electronic resource]
260 $c2007
520 $aThe energy balance of a young (one to two year-old), drip irrigated coffee crop in hedgerows configuration was determined using the energy balance-Bowen ratio (EBBR) method, during two periods in the wet season [October?Dezember/2002 (P1) and February?March/2003 (P2)] and two in the dry season [May?July/2003 (P3) and August?September/2003 (P4)], in Piracicaba, São Paulo State, Brazil. An analysis of errors affecting the estimates of latent and sensible heat fluxes was performed. Emphasis was given on determining the reliability of the assumption that Kh=Kw in the EBBR method, in view of the possibility of occurrence of sensible heat advection (regional and or within-row) and on the effect of errors of measurements of the air temperature and vapor pressure through the use of thermocouple psychrometers. The psychrometric errors had a more prevalent effect in the dry periods when the humidity gradients were lower than during the humid periods, leading to a larger discarding of measurement during P3 and P4. In the wet periods, it was deduced that the assumption of Kh=Kw did not introduce a large effect on the estimates of the heat fluxes, but during the dry periods this similarity could not be assumed as a function of advective fluxes. The soil surface water conditions were the main factor that determined the energy partitioning. The latent heat flux represented more than 80% of the available energy (Rn?G) in the wet season, decreasing to 78% in P3 and 64% in P4, the dry periods. However, values obtained during P4 were affected by problems on management of the coffee crop. Weeds growing in the inter-rows affected the energy partitioning mostly during periods with low rainfall. The effect of coffee growth and the weeds on the latent heat flux was masked by the soil humidity inside each studied period. In the early dry period, the effect of inter-row weeds on the latent heat flux was important, because they could have extracted water from deep depths in the soil.
650 $aadvection
650 $aBalanço de energia
650 $aCafé
650 $aClima
650 $aIrrigação
653 $aAdvecção
653 $aCalor sensível
653 $aErros de medidas
653 $aFluxo de energia latente
653 $aPsicrometria
653 $aPsychrometry
700 1 $aANGELOCCI, L. R.
700 1 $aMARIN, F. R.
773 $tRevista Brasileira de Agrometeorologia, Piracicaba$gv. 15, n. 3, p. 267-279, 2007.
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Embrapa Agricultura Digital (CNPTIA) |
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| Registros recuperados : 11 | |
| 1. |  | DUARTE, J. O. Situação da cultura do sorgo no Brasil. In: EMBRAPA. Centro de Nacional de Pesquisa de Milho e Sorgo. Relatório técnico anual do Centro Nacional de Pesquisa de Milho e Sorgo: período 1992-1993. Sete Lagoas, 1994. v. 6, p. 13-14.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 5. | | DUARTE, J. O.; MONTEIRO, J. A.; MIRANDA, J. E.; VIANA, A. C. Comparação de custos de produção de silagens de milho, sorgo e capim elefante, o caso de Sete Lagoas-MG. In: CONGRESSO NACIONAL DE MILHO E SORGO, 21., 1996, Londrina. Resumos... Londrina: IAPAR, 1996. p. 333.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 7. | | VIANA, A. C.; FERREIRA, J. J.; MIRANDA, J. E. C.; VALENTE, J. O.; DUARTE, J. O.; HORTA, M. L. Efeito de silagens de diferentes cultivares de milho, de sorgo e de capim elefante no desempenho de novilhos confinados. In: CONGRESSO NACIONAL DE MILHO E SORGO, 20., 1994, Goiânia. Centro-Oeste: cinturão do milho e do sorgo no Brasil: resumos. Sete Lagoas: ABMS, 1994. p. 193.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 9. | | AMARAL, T. A.; ANDRADE, C. L. T.; DUARTE, J. O.; GARCIA, J. C.; GARCIA Y GARCIA, A.; SILVA, D. F.; ALBERNAZ, W. M.; HOOGENBOOM, G. Nitrogen management strategies for smallholder maize production systems: yield and profitability variability. International Journal of Plant Production, v. 9, n. 1, p. 75-98, 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 10. | | CAPALBO, D. M. F.; SIMON, M. F.; NODARI, R. O.; VALLE, S.; SANTOS, R. F. dos; CORADIN, L.; DUARTE, J. O.; MIRANDA, J. E.; DIAS, E. P. F.; QUYEN, L. Q.; UNDERWOOD, E.; NELSON, K. C. Consideration of problem formulation and option assessment for Bt cotton in Brazil. In: HILBECK, A.; ANDOW, D. A. FONTES, E. M. G. Methodologies for assessing Bt cotton in Brazil. In: KAPUSCINSKI, A. R.; SCHEI, P. J. Environmmental risk assessment of genetically modified organisms. WALLINGFORD: CABI PUBLISHING, 2006. v. 2, P. 67-92.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 11. | | SCHAFFERT, R. E.; ALBUQUERQUE, P. E. P.; DUARTE, J. O.; GARCIA, J. C.; GOMIDE, R. L.; GUIMARAES, C. T.; MAGALHAES, P. C.; MAGALHAES, J. V.; QUEIROZ, V. A. V. Phenotyping sorghum for adaptation to drought. In: MONNEVEUX, P.; RIBAUT, J.-M. (Ed.). Drought phenotyping in crops: from theory to practice. Mexico, DF: CGIAR: CIMMYT, 2011. pt. 2, p. 287-299.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| Registros recuperados : 11 | |
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