Componentes do balanço de energia estimados por meio do método da razão de bowen em um pomar de caju Components of energy balance estimated by the method of reason bowen in an orchard cashew

O estudo foi conduzido na Fazenda Experimental da Universidade Federal de Mato Grosso no municipio de Santo Antonio de Leverger em um pomar de caju ( Anarcadiaceae ). O objetivo do trabalho foi avaliar o balanco de energia usando o metodo da razao de Bowen em cajueiros com idade de dez anos e altura media de 3,5 metros. Foram avaliados os fluxos de calor latente de evapotranspiracao (LE), sensivel (H) e do solo (G), na estacao seca, nos dias julianos de 248 a 253 ,do ano de 2012. O saldo de radiacao (Rn) e o fluxo de calor no solo (G) foram medidos instrumentalmente por uma torre micrometeologica instalada no interior do pomar. Os Valores de H e LE foram proximos entre as 10:00 e 13:00 horas, no entanto ocorreram valores de H superior a LE nos dias julianos 248 e 250. LE e H representaram 71% e 26% de Rn, respectivamente. A razao de Bowen apresentou valores positivos nos dias 252 e 253 e negativos nos dias 248 a 251. Abstract This study was conducted at the Experimental Farm of the Federal University of Mato Grosso in the municipality of Santo Antonio de Leverger in a cashew orchard ( Anarcadiaceae ). The objective of the study was to evaluate the energy balance using the Bowen ratio method in a cashew orchard aged 10 years with an average height of 3.5 m. It was evaluated the fluxes of latent heat of evapotranspiration (LE), sensitive (H) and the heat flux into the soil (G) in the dry season in the Julian days of 248 to 253 in the year 2012. The net radiation (Rn) and the heat flux into the soil (G) were instrumentally measured by a micrometeorologic tower installed inside the orchard. The results showed that the flow value of H and LE were close between 10:00 and 13:00 o’ clock; however values of H occurred to be higher than LE in the Julian days of 248 and 250. LE and H represented 71% and 26% of Rn respectively. The Bowen ratio method showed positive values on days 252 and 253, and negative ones on days 248-251.