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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
05/07/1996 |
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Data da última atualização: |
05/09/1996 |
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Autoria: |
STANHILL, G. |
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Título: |
A comparison of methods of calculating potential evapotranspiration from climatic data. |
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Ano de publicação: |
1961 |
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Fonte/Imprenta: |
Israel Journal Agricultural Research, v.11, n.3/4, p.159-171, Dec. 1961. |
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Idioma: |
Inglês |
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Conteúdo: |
Measurements of potential evapotranspiration from alafalfa, made under arid conditions in southern Israel, have shown that there are a number of sufficiently practical and accurate meteorological methods of estimating water loss available for field practice. The resulta indicate that, of the eight methods tested, those based on open water evaporation, measured in standard evaporation tanks or pans or estimated by Penman's method, are the best. The simpler but more empirical formulae are satisfactory only if the local correction factors, which are substantial, are known. A comparison of these results with other measurements of potential evapotranspiration made under semi-arid conditions indicated a very considerable effect of the size of the irrigated area on the rate of water loss. It is suggested that this is one of the reasons why the recommended amounts of irrigation for optimum field practice are often substantially less than the estimated potential requirements. |
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Palavras-Chave: |
Calculating potential; Calculo; Climatic data; Comparison of methods; Dado climatico; Metodo comparativo; Metodo de calcular; Potencial; Potencial de dados climaticos. |
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Thesagro: |
Evapotranspiração. |
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Thesaurus Nal: |
evapotranspiration. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01737naa a2200253 a 4500
001 1789627
005 1996-09-05
008 1961 bl --- 0-- u #d
100 1 $aSTANHILL, G.
245 $aA comparison of methods of calculating potential evapotranspiration from climatic data.
260 $c1961
520 $aMeasurements of potential evapotranspiration from alafalfa, made under arid conditions in southern Israel, have shown that there are a number of sufficiently practical and accurate meteorological methods of estimating water loss available for field practice. The resulta indicate that, of the eight methods tested, those based on open water evaporation, measured in standard evaporation tanks or pans or estimated by Penman's method, are the best. The simpler but more empirical formulae are satisfactory only if the local correction factors, which are substantial, are known. A comparison of these results with other measurements of potential evapotranspiration made under semi-arid conditions indicated a very considerable effect of the size of the irrigated area on the rate of water loss. It is suggested that this is one of the reasons why the recommended amounts of irrigation for optimum field practice are often substantially less than the estimated potential requirements.
650 $aevapotranspiration
650 $aEvapotranspiração
653 $aCalculating potential
653 $aCalculo
653 $aClimatic data
653 $aComparison of methods
653 $aDado climatico
653 $aMetodo comparativo
653 $aMetodo de calcular
653 $aPotencial
653 $aPotencial de dados climaticos
773 $tIsrael Journal Agricultural Research$gv.11, n.3/4, p.159-171, Dec. 1961.
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Registro original: |
Embrapa Pantanal (CPAP) |
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