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• W2066883979 abstract "A exigencia hidrica de plantas cultivadas e dependente de fatores relacionados a planta, ao solo e ao clima. O planejamento da irrigacao requer o conhecimento das necessidades hidricas das plantas, sendo uma resposta a demanda evaporativa da atmosfera. Dentre os principais metodos de estimativa da demanda evaporativa, destacam-se aqueles que se utilizam do valor de S, ou seja, a tangente a curva de pressao de saturacao em funcao da temperatura, que compoe o fator de ponderacao no efeito da radiacao solar sobre a evapotranspiracao (W). Propoe-se neste estudo a determinacao de S e W em funcao da media entre as temperaturas do psicrometro (Tsu), como sugere Monteith (1965), demonstrando-se tambem quais erros que ocasionam este calculo quando e feito da maneira usual, ou seja, em funcao apenas da temperatura de bulbo seco. A metodologia sugerida para os ajustes propostos no calculo de S revelou diferencas de ate 34% em relacao aos valores usuais quando estimados em condicoes de baixa umidade relativa e temperatura do ar mais elevada. UNITERMOS: evapotranspiracao, correcao do fator S, equacao de Penman. VILLA NOVA, N.A.; PEREIRA, A.B.; PEREIRA, A.R.  S AND W ADJUSTMENTS OF PENMAN’S EQUATION AS A FUNCTION OF THE AVERAGE TEMPERATURE BETWEEN DRY AND WET BULBS 2 ABSTRACT The crop water requirement depends upon factors related to plant, soil and climate. Irrigation planning requires the knowledge of crop water needs, which is a response to the atmospheric evaporative demand. Among the main estimating methods to calculate the potential demand, those that utilize the value of S, that is, the slope of water vapor saturation pressure, which comprises the weighting factor for the effect of solar radiation on evapotranspiration (W) might be stood out. In the current paper, the determination of S and W as a function of the average temperature between dry and wet bulbs (Tsu), as suggested by Monteith (1965) has been proposed, and a demonstration of errors that were brought about by means of such calculation when it is made by the usual manner, that is, as a function of only the dry bulb temperature, has been presented as well. The suggested methodology for the adjustments proposed on the calculation of S has revealed differences of up to 34% in relation to the usual values when estimated under low relative humidity and higher air temperature conditions. KEYWORDS: evapotranspiration, correction of S factor, Penman’s equation." @default.
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• W2066883979 date "2002-10-13" @default.
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• W2066883979 title "AJUSTES DE S E W DA EQUAÇÃO DE PENMAN EM FUNÇÃO DA MÉDIA ENTRE AS TEMPERATURAS DO PSICRÔMETRO" @default.
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• W2066883979 doi "https://doi.org/10.15809/irriga.2002v7n3p241" @default.
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