| |
|
|
| Registros recuperados : 164 | |
| 14. |  | BATISTA, E. R.; RAMOS, N. P.; LUCHIARI JUNIOR, A. Bioeletricidade, mercado de carbono e o setor sucroalcooleiro paulista. In: STAB: Açúcar, álcool e subprodutos, v.27, n.2, p.32, 2008. Reumos do 9. Congresso Nacional da STAB, 2008, Maceió.| Biblioteca(s): Embrapa Meio Ambiente. |
|    |
| 17. | | RAMOS, N. P.; DELGADO JUNIOR, J. P.; LUCHIARI JUNIOR, A. Expansão do girassol no Brasil: monitoramento de tendências. In: REUNIÃO NACIONAL DE PESQUISA DO GIRASSOL, 18.; SIMPÓSIO NACIONAL SOBRE A CULTURA DO GIRASSOL, 6., 2009, Pelotas. Anais... Pelotas: Embrapa Clima Temperado, 2009. Editado por Ana Paula Schneid Afonso Rosa, Márcia Vizzotto, Simone Ery Grosskopf. p. 37-43.| Biblioteca(s): Embrapa Meio Ambiente. |
| |
| Registros recuperados : 164 | |
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Cerrados. |
|
Data corrente: |
11/02/1993 |
|
Data da última atualização: |
23/04/1999 |
|
Autoria: |
LUCHIARI JUNIOR, A. |
|
Título: |
Measurements and predictions of evapotranspiration rates from irrigated wheat in the cerrados region of central Brazil. |
|
Ano de publicação: |
1988 |
|
Fonte/Imprenta: |
Ithaca: Cornell University, 1988. |
|
Páginas: |
171p. |
|
Idioma: |
Inglês |
|
Notas: |
Tese Doutorado. |
|
Conteúdo: |
The purpose of this study was to characterize evapotranspiration for irrigated wheat growing in the Cerrados Region of Central Brazil and to evaluate and test various methods for predicting evapotranspiration. Bowen ratio measurements were made on an hourly basis over irrigated wheat crops grown in the dry seasons of 1982 and 1983. This data was analyzed in order to evaluate factors affecting crop evapotranspiration and also was compared to rates of evapotranspiration predicted using the Priestley-Taylor equation and Monteith combination model. By comparing measured evapotranspiration to net radiation it was shown that sensible heat advection, for local and regional origin, can significantly affect crop water requirements in this region. The prortionality constant in the Prestley-Taylor equation had an average value of 1.2 for potential conditions under non-advective conditions and decrease gradually between irrigations. For irrigation management purposes the use of a value of 1.5 was seemed appropriate. Bulk canopy resistance required in the Monteith combination model was calculated using the energy balance method and the resindual method. Both methods produced comparable results and indicated that this resistance varied within well defined limits dictated by irrigation timing. When the combination model was used to predict crop evapotranspiration, results were in good agreement with those obtained from energy balance measurements. In calculating the aerodynamic resistance it was found that the effects of stability could be ignored. Also crop surface temperature predicted from measurements of wind speed and air temperature at one height above the canopy were in good agreement with infrared measured canopy temperarure. In order to evaluate the supply function for models predicting water movement in the soil-plant-atmosphere continuum the Libardi and Campbell methods for estimating soil hydraulic conductivity as a function of water content were compared. They produced similar results. The parametes required in Campbell's method could be obtained from routine soil characterization data, but field saturated hydraulic conductivity and field saturated water content must be known. Measured and predicted daily evapotranspiration rates and soil water potential at the upper 10cm soil-layer were in good agreement when the Monteith combination model was used as a demand function in a single-layer canopy and multi-layer soil model (GAPS). Predictions of hourly energy fluxes using a multi-layer canopy and multi-layer soil model (Cupid) were in good agreement with measured energy fluxes. MenosThe purpose of this study was to characterize evapotranspiration for irrigated wheat growing in the Cerrados Region of Central Brazil and to evaluate and test various methods for predicting evapotranspiration. Bowen ratio measurements were made on an hourly basis over irrigated wheat crops grown in the dry seasons of 1982 and 1983. This data was analyzed in order to evaluate factors affecting crop evapotranspiration and also was compared to rates of evapotranspiration predicted using the Priestley-Taylor equation and Monteith combination model. By comparing measured evapotranspiration to net radiation it was shown that sensible heat advection, for local and regional origin, can significantly affect crop water requirements in this region. The prortionality constant in the Prestley-Taylor equation had an average value of 1.2 for potential conditions under non-advective conditions and decrease gradually between irrigations. For irrigation management purposes the use of a value of 1.5 was seemed appropriate. Bulk canopy resistance required in the Monteith combination model was calculated using the energy balance method and the resindual method. Both methods produced comparable results and indicated that this resistance varied within well defined limits dictated by irrigation timing. When the combination model was used to predict crop evapotranspiration, results were in good agreement with those obtained from energy balance measurements. In calculating the aerodynamic resistance ... Mostrar Tudo |
|
Palavras-Chave: |
Brasil; Epoca seca; Medida; Regiao Central; Wheats. |
|
Thesagro: |
Cerrado; Cultura Irrigada; Evapotranspiração; Irrigação; Manejo; Solo; Trigo; Triticum Aestivum. |
|
Thesaurus NAL: |
evapotranspiration; irrigation. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 03444nam a2200313 a 4500
001 1563329
005 1999-04-23
008 1988 bl uuuu m 00u1 u #d
100 1 $aLUCHIARI JUNIOR, A.
245 $aMeasurements and predictions of evapotranspiration rates from irrigated wheat in the cerrados region of central Brazil.
260 $aIthaca: Cornell University$c1988
300 $a171p.
500 $aTese Doutorado.
520 $aThe purpose of this study was to characterize evapotranspiration for irrigated wheat growing in the Cerrados Region of Central Brazil and to evaluate and test various methods for predicting evapotranspiration. Bowen ratio measurements were made on an hourly basis over irrigated wheat crops grown in the dry seasons of 1982 and 1983. This data was analyzed in order to evaluate factors affecting crop evapotranspiration and also was compared to rates of evapotranspiration predicted using the Priestley-Taylor equation and Monteith combination model. By comparing measured evapotranspiration to net radiation it was shown that sensible heat advection, for local and regional origin, can significantly affect crop water requirements in this region. The prortionality constant in the Prestley-Taylor equation had an average value of 1.2 for potential conditions under non-advective conditions and decrease gradually between irrigations. For irrigation management purposes the use of a value of 1.5 was seemed appropriate. Bulk canopy resistance required in the Monteith combination model was calculated using the energy balance method and the resindual method. Both methods produced comparable results and indicated that this resistance varied within well defined limits dictated by irrigation timing. When the combination model was used to predict crop evapotranspiration, results were in good agreement with those obtained from energy balance measurements. In calculating the aerodynamic resistance it was found that the effects of stability could be ignored. Also crop surface temperature predicted from measurements of wind speed and air temperature at one height above the canopy were in good agreement with infrared measured canopy temperarure. In order to evaluate the supply function for models predicting water movement in the soil-plant-atmosphere continuum the Libardi and Campbell methods for estimating soil hydraulic conductivity as a function of water content were compared. They produced similar results. The parametes required in Campbell's method could be obtained from routine soil characterization data, but field saturated hydraulic conductivity and field saturated water content must be known. Measured and predicted daily evapotranspiration rates and soil water potential at the upper 10cm soil-layer were in good agreement when the Monteith combination model was used as a demand function in a single-layer canopy and multi-layer soil model (GAPS). Predictions of hourly energy fluxes using a multi-layer canopy and multi-layer soil model (Cupid) were in good agreement with measured energy fluxes.
650 $aevapotranspiration
650 $airrigation
650 $aCerrado
650 $aCultura Irrigada
650 $aEvapotranspiração
650 $aIrrigação
650 $aManejo
650 $aSolo
650 $aTrigo
650 $aTriticum Aestivum
653 $aBrasil
653 $aEpoca seca
653 $aMedida
653 $aRegiao Central
653 $aWheats
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Cerrados (CPAC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
