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	Provedor de dados Scientia Agricola (1) AGRIAMBI (1) Autor Conceição,Marco Antônio Fonseca (1) Folegatti,Marcos V. (1) Sentelhas,Paulo C. (1) Palavra-chave Pan coefficient (2) Irrigation (1) Irrigation scheduling (1) Penman-Monteith (1) Weighing lysimeter (1) Tipo do documento Info:eu-repo/semantics/article (2) Ano 2003 (1) 2002 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Class A pan coefficients (Kp) to estimate daily reference evapotranspiration (ETo) AGRIAMBI Sentelhas,Paulo C.; Folegatti,Marcos V.. The class A pan coefficient (Kp) has been used to convert pan evaporation (ECA) to grass-reference evapotranspiration (ETo), an important component in water management of irrigated crops. There are several methods to determine Kp values, using wind speed, relative humidity and fetch length and conditions. This paper analyses the following methods to estimate Kp values: Doorenbos & Pruitt (1977); Cuenca (1989); Snyder (1992); Pereira et al. (1995); Raghuwanshi & Wallender (1998); and FAO/56 (Allen et al., 1998). The estimated values of Kp and the observed Kp, obtained from the relationship between ETo measured in a weighing lysimeter and ECA measured in a class A pan, were compared by regression analysis. The same routine was adopted to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Pan coefficient; Irrigation scheduling; Weighing lysimeter. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662003000100018 Reference evapotranspiration based on class A pan evaporation Scientia Agricola Conceição,Marco Antônio Fonseca. Estimating reference evapotranspiration (ETo) based on Class A pan evaporation (ECA) is very usual in irrigated areas. For this purpose the ECA values are multiplied by a pan coefficient (Kp) to obtain ETo. Kp values can be estimated in different ways being, however, important to know which method would estimate the best value for a given locality. In the present work estimated values of ETo based on Class A pan evaporation, using Kp values determined by different methods, were compared to Penman-Monteith-FAO (EToPM) values for the northwest region of the São Paulo State, Brazil. The annual average Kp, determined dividing EToPM by ECA, was 0.74. For the rainy months (December to March) the average Kp value was 0.80 and for the dry months (April to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Penman-Monteith; Pan coefficient; Irrigation. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300001 Registros recuperados: 2 Primeira ... 1 ... Última

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