Authors : Vicente de Paulo R. da Silva , Pedro V. de Azevedo and Bernardo B. da Silva
Abstract: Measurements of energy balance components were obtained in a field experiment to analyze the energy balance components on a mango orchard during two fruiting cycle. The Bowen Ratio-energy Balance (BREB) method was applied in order to estimate the energy fluxes while the reference evapotranspiration (ETo) was obtained according to FAO 56. It was establish a relationship between latent heat flux (LE) and the net Radiation (Rn) for three availability energy levels. The results showed that during both field campaigns LE was found to be the major component of the energy balance, comprising more than 80% of the available energy, while G was always a small component, comprising less than 6% of total Rn. The daily mean values of ETo and ETc were similar in both measurement periods even though these were higher slightly in the 1998 fruiting cycle than values observed in 1999. For the 1998 and 1999 fruiting cycles the cumulative estimates of crop evapotranspiration (ETc) were 719.3 and 675.8 mm, respectively, while the ETo for these two experimental periods were 819.8 and 784.8 mm, respectively. The determination coefficients (r2) values for the linear relationships between of net radiation and latent heat flux varied according to the available energy level, ranging from 0.82 for the moderate level in the 1998 fruiting cycle to 0.99 for the high available energy in 1999.
Vicente de Paulo R. da Silva , Pedro V. de Azevedo and Bernardo B. da Silva , 2006. Seasonal Patterns of the Energy Balance Components in a Mango (Mangifera indica L.) Orchard grown in Northeast Brazil. Agricultural Journal, 1: 18-23.