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Registro Completo |
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
02/12/2014 |
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Data da última atualização: |
02/12/2014 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
TEIXEIRA, A. H. de C.; HERNANDEZ, F. B. T.; ANDRADE, R. G.; LEIVAS, J. F.; BOLFE, E. L. |
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Afiliação: |
ANTONIO HERIBERTO DE C TEIXEIRA, CNPM; FERNANDO B. T. HERNANDEZ, UNESP; RICARDO GUIMARAES ANDRADE, CNPM; JANICE FREITAS LEIVAS, CNPM; EDSON LUIS BOLFE, CNPM. |
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Título: |
Energy balance with Landsat images in irrigated central pivots with corn crop in the São Paulo State, Brazil. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Proceedings of SPIE, v. 9239, p. 92390O-1 - 92390O-10, 2014. |
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ISBN: |
0277-786X |
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DOI: |
10.1117/12.2067090 |
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Idioma: |
Português |
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Notas: |
Presented at the 16th Remote Sensing for Agriculture, Ecosystems, and Hydrology. |
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Conteúdo: |
The energy balance (EB) components were quantified in a commercial farm with corn crop, irrigated by central pivots, in the Northwestern side of São Paulo state, Southeast Brazil. The SAFER (Simple Algorithm For Evapotranspiration Retrieving) was applied to retrieve the latent heat flux (λE), considering six pivots, covering irrigated areas from 74 to 108 ha. With λE quantified and considering soil heat flux (G) as a fraction of net radiation (Rn), the sensible heat flux (H) was acquired as a residual in the energy balance equation. Seven Landsat satellite images, covering all corn crop stages from 23 April 2010 to 29 August 2010, allowed relating the energy balance components according to the accumulated degree-days (DDac) from the planting to harvest dates. The average Rn values ranging from 5.2 to 7.2 MJ m-2 day-1, represented 30 to 45% of global solar radiation (RG). Considering the variation of the energy balance components along the corn crop growing seasons, the average ranges for λE, H and G were respectively 0.0 to 6.4 MJ m-2 day-1, -1.5 to 6.7 MJ m-2 day-1 and 0.1 to 0.6 MJ m-2 day-1. The fraction of the available energy (Rn - G) used as λE was from 0.0 to 1.3 indicated a good irrigation management, insuring that the water deficit could not be the reason of any yield reduction. Although Rn did not reflected well the crop stages, its partition strongly depended on these stages. λE higher than Rn and the negative H/Rn, happened sometimes along the corn growing seasons. This occurred after the vegetative growth and before the harvest times, indicating heat advection from the surrounding areas to the irrigation pivots, which represented an additional energy source for the evaporative process. The models applied here with only the visible and infrared bands of the Landsat sensor are very useful for the energy balance analyses, considering the size of the corn crop irrigation pivots in Southeast Brazil, when subsidizing a rational irrigation water application in corn crop. MenosThe energy balance (EB) components were quantified in a commercial farm with corn crop, irrigated by central pivots, in the Northwestern side of São Paulo state, Southeast Brazil. The SAFER (Simple Algorithm For Evapotranspiration Retrieving) was applied to retrieve the latent heat flux (λE), considering six pivots, covering irrigated areas from 74 to 108 ha. With λE quantified and considering soil heat flux (G) as a fraction of net radiation (Rn), the sensible heat flux (H) was acquired as a residual in the energy balance equation. Seven Landsat satellite images, covering all corn crop stages from 23 April 2010 to 29 August 2010, allowed relating the energy balance components according to the accumulated degree-days (DDac) from the planting to harvest dates. The average Rn values ranging from 5.2 to 7.2 MJ m-2 day-1, represented 30 to 45% of global solar radiation (RG). Considering the variation of the energy balance components along the corn crop growing seasons, the average ranges for λE, H and G were respectively 0.0 to 6.4 MJ m-2 day-1, -1.5 to 6.7 MJ m-2 day-1 and 0.1 to 0.6 MJ m-2 day-1. The fraction of the available energy (Rn - G) used as λE was from 0.0 to 1.3 indicated a good irrigation management, insuring that the water deficit could not be the reason of any yield reduction. Although Rn did not reflected well the crop stages, its partition strongly depended on these stages. λE higher than Rn and the negative H/Rn, happened sometimes alon... Mostrar Tudo |
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Palavras-Chave: |
Latent heat flux; Net radiation; Sensible heat flux; Soil heat flux. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/112782/1/4200.pdf
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Marc: |
LEADER 02880naa a2200253 a 4500
001 2001276
005 2014-12-02
008 2014 bl uuuu u00u1 u #d
022 $a0277-786X
024 7 $a10.1117/12.2067090$2DOI
100 1 $aTEIXEIRA, A. H. de C.
245 $aEnergy balance with Landsat images in irrigated central pivots with corn crop in the São Paulo State, Brazil.$h[electronic resource]
260 $c2014
500 $aPresented at the 16th Remote Sensing for Agriculture, Ecosystems, and Hydrology.
520 $aThe energy balance (EB) components were quantified in a commercial farm with corn crop, irrigated by central pivots, in the Northwestern side of São Paulo state, Southeast Brazil. The SAFER (Simple Algorithm For Evapotranspiration Retrieving) was applied to retrieve the latent heat flux (λE), considering six pivots, covering irrigated areas from 74 to 108 ha. With λE quantified and considering soil heat flux (G) as a fraction of net radiation (Rn), the sensible heat flux (H) was acquired as a residual in the energy balance equation. Seven Landsat satellite images, covering all corn crop stages from 23 April 2010 to 29 August 2010, allowed relating the energy balance components according to the accumulated degree-days (DDac) from the planting to harvest dates. The average Rn values ranging from 5.2 to 7.2 MJ m-2 day-1, represented 30 to 45% of global solar radiation (RG). Considering the variation of the energy balance components along the corn crop growing seasons, the average ranges for λE, H and G were respectively 0.0 to 6.4 MJ m-2 day-1, -1.5 to 6.7 MJ m-2 day-1 and 0.1 to 0.6 MJ m-2 day-1. The fraction of the available energy (Rn - G) used as λE was from 0.0 to 1.3 indicated a good irrigation management, insuring that the water deficit could not be the reason of any yield reduction. Although Rn did not reflected well the crop stages, its partition strongly depended on these stages. λE higher than Rn and the negative H/Rn, happened sometimes along the corn growing seasons. This occurred after the vegetative growth and before the harvest times, indicating heat advection from the surrounding areas to the irrigation pivots, which represented an additional energy source for the evaporative process. The models applied here with only the visible and infrared bands of the Landsat sensor are very useful for the energy balance analyses, considering the size of the corn crop irrigation pivots in Southeast Brazil, when subsidizing a rational irrigation water application in corn crop.
653 $aLatent heat flux
653 $aNet radiation
653 $aSensible heat flux
653 $aSoil heat flux
700 1 $aHERNANDEZ, F. B. T.
700 1 $aANDRADE, R. G.
700 1 $aLEIVAS, J. F.
700 1 $aBOLFE, E. L.
773 $tProceedings of SPIE$gv. 9239, p. 92390O-1 - 92390O-10, 2014.
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Registro original: |
Embrapa Territorial (CNPM) |
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Biblioteca |
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Registro |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Trigo. Para informações adicionais entre em contato com cnpt.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
28/04/2008 |
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Data da última atualização: |
28/04/2008 |
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Tipo da produção científica: |
Artigo de Divulgação na Mídia |
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Circulação/Nível: |
-- - -- |
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Autoria: |
TEIXEIRA, M. C. C. |
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Afiliação: |
Mauro César Celaro Teixeira, Embrapa Trigo. |
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Título: |
Efeito de estresse na cultura de milho. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Agrolink, 2007. |
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Idioma: |
Português |
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Notas: |
Também publicado: Portal do Agronegócio, Viçosa, 23 jan. 2007. Disponível em . ; Zoonews, 25 jan. 2007. Disponível em . |
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Conteúdo: |
Disponível em . |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00568naa a2200133 a 4500
001 1841283
005 2008-04-28
008 2007 bl --- 0-- u #d
100 1 $aTEIXEIRA, M. C. C.
245 $aEfeito de estresse na cultura de milho.
260 $c2007
500 $aTambém publicado: Portal do Agronegócio, Viçosa, 23 jan. 2007. Disponível em <http://www.portaldoagronegocio.com.br/index.php?p=texto&idT>. ; Zoonews, 25 jan. 2007. Disponível em <http://www.zoonews.com.br>.
520 $aDisponível em <http://www.agrolink.com.br>.
773 $tAgrolink, 2007.
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