LAUSR

The Mossoró-Assu-Baraúna district, Rio Grande do Norte State (RN), is recognized by the intense production of horticulture, mainly muskmelon for export. However, this region is often devastated by intense droughts. Thus, the muskmelon production is predominantly under irrigated condition and, due to constant threat of water resources collapse on the region, a rigorous irrigation water management in the region is needed. The main objective of this article was to analyze the seasonal pattern of energy balance partitioning and evapotranspiration on irrigated muskmelon crop on the region around Mossoró-RN. The study was carried out in two areas of commercial production of muskmelons in the Mossoró-Assu-Barúna district, during two growth seasons from 2012-Jun to 2012-Nov. The components of energy balance AGROMETEOROLOGY Article Energy balance partitioning and evapotranspiration from irrigated Muskmelon under Semi-Arid Conditions Giuliana Mairana Morais de Sousa Vanomark1, José Espínola Sobrinho1, José Renato Cortez Bezerra2, Carlos Antonio Costa dos Santos3, Pedro Vieira de Azevedo3, Saulo Tasso Araújo da Silva4, Bergson Guedes Bezerra5* 1.Universidade Federal Rural do Semiárido Programa de Pós-graduação em Manejo de Solo e Água Mossoró (RN), Brazil. 2.Empresa Brasileira de Pesquisa Agropecuária Embrapa Algodão Campina Grande (PB), Brazil. 3.Universidade Federal de Campina Grande Unidade Acadêmica de Ciências Atmosféricas Campina Grande (PB), Brazil. 4.Universidade Federal Rural do Semiárido Departamento de Ciências Ambientais e Tecnológicas Mossoró (RN), Brazil. 5.Universidade Federal do Rio Grande do Norte Departamento de Ciências Atmosféricas e Climáticas Natal (RN), Brazil. *Corresponding author: [email protected] Received: Oct. 31, 2016 – Accepted: Feb. 28, 2017 and evapotranspiration were determined by using the Bowen Ratio Energy Balance method. It was observed that more than 60% of the net radiation (Rn) was converted into latent heat flux (λE), while 21 and 11% of Rn was converted into sensible heat flux (H) and soil heat flux (G), respectively. The ratio λE/Rn varies according to the change of leaf area index (LAI) while the ratios H/Rn and G/Rn vary inversely with the LAI. The agreement λE/Rn and LAI is also evidenced by similarity between curves of crop evapotranspiration (ETc) and LAI, particularly when the melon crop reaches its maximum vegetative growth (LAI > 3). The muskmelon ETc ranged from 265 to 289 mm, values that are similar to those found by other researcher.