calculation of the class-a pan coefficient in greenhouse and field by different methods
coeficiente do tanque classe a obtido por diferentes métodos em ambiente protegido e no campo

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ID: 128532
2011
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Abstract
There are several methods for determining the Class-A pan coefficient (Kp) to estimate the reference evapotranspiration (ETo), which is of great importance to water management in agriculture. Most of these methods take into account the wind speed, relative humidity and the fetch area. This study was done in region of Botucatu, SP, in greenhouse and field in the months of July-August (dry) and September-October (rainy), used the methods of Doorenbos e Pruitt (1977), Cuenca (1989), Snyder (1992), Pereira et al. (1995), Allen et al. (1998) and correlation between ETo determined by Penman-Monteith (EToPM) and evaporation of the Class-A pan (ECA). The EToPM was used as standard for the correlations between the ETo determined by the Class-A pan (EToTCA) obtained by different methods of Kp. The Kp in greenhouse ranged between 0.51 and 0.85, and in the field from 0.33 to 0.85. The methods of Allen et al. (1998) and Snyder (1992) are the most recommended for dry months in greenhouse and rainy months the correlation between the ECA and EToPM e Cuenca (1989). In the field condition, the methods of Allen et al. (1998) and of correlation between the ECA and EToPM for dry months, and for rainy months of Allen et al. (1998) and Cuenca (1989). The method of Allen et al. (1998) was the most efficient, regardless of the environment and of months analyzed. The fixed value of Kp should only be used when it is not possible to determine from its more sophisticated methods.

Atualmente existem vários métodos para a determinação do coeficiente do tanque Classe A (Kp) na estimativa da evapotranspiração de referência (ETo), o qual é de importância para o manejo da água na agricultura. A maioria desses métodos leva em conta a velocidade do vento, a umidade relativa do ar e a área de bordadura. Este estudo foi realizado na região de Botucatu, SP, em condições de ambiente protegido e em campo nos meses de julho-agosto (seco) e setembro-outubro (chuvoso), utilizando os métodos de Doorenbos e Pruitt (1977), Cuenca (1989), Snyder (1992), Pereira et al. (1995), Allen et al. (1998) e correlação entre ETo determinada por Penman-Monteith (EToPM) e a evaporação do tanque Classe A (ECA). A EToPM foi utilizada como padrão para as correlações com a evapotranspiração de referência pelo método do tanque Classe A (EToTCA) obtida pelos diferentes métodos de Kp. As variações de Kp no ambiente protegido foram de 0,51 a 0,85, e em campo de 0,33 a 0,85. Em ambiente protegido, os métodos de Allen et al. (1998) e Snyder (1992) são os mais recomendados para meses secos, e os da correlação entre EToPM e ECA e Cuenca (1989) para meses chuvosos. Já em condição de campo, os métodos de Allen et al. (1998) e da correlação entre EToPM e ECA para os meses secos, e os de Allen et al.(1998) e Cuenca (1989) para os meses chuvosos. O método de Allen et al. (1998) foi o mais eficiente, independente do ambiente e dos meses analisados. O valor fixo de Kp só deve ser utilizado quando não houver a possibilidade de sua determinação a partir de métodos mais sofisticados.

Reference Key
cunha2011semina:calculation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Antonio Ribeiro Cunha
Journal frontiers in neuroendocrinology
Year 2011
DOI
10.5433/1679-0359.2011v32n2p451
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/3260
Keywords
Agriculture (General)

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