ENERGETIC ASPECTS OF THE DEVELOPMENT OF CONILON COFFEE IN THE NORTH OF RIO DE JANEIRO. PART 2 - ENERGY BALANCE

Abstract

Conilon coffee represents a good portion of Brazilian coffee growing and it is essential to understand how the crop relates to the energy available in the environment. Due to this, this work sought to determine the components of the energy balance of the Conilon coffee crop in the North Fluminense region during seven seasons. The experiment was conducted in a crop field in the area belonging to the Universidade Estadual do Norte Fluminense Darcy Ribeiro, in Campos dos Goytacazes, RJ, which contains a micrometeorological station that monitored environmental data between June 2015 and May 2022. With this information, the energy balance was performed by the Bowen ratio method, which made it possible to determine the crop evapotranspiration (ETc), the reference evapotranspiration (ET0) and the crop coefficient (Kc). The energy balance method by Bowen's ratio had satisfactory performance and indicated that 66% of Rn was converted into LE, 24% into H and 10% into G. The average evapotranspiration of the crop was 3.81 mm.day-1 and the average Kc per harvest tended to increase throughout the experiment and ranged from 0.82 to 0.92. Conilon coffee presented an average yield of 3.43 t.ha-1 (57.16 sc.ha-1) and it was concluded that an average of 0.08 g per MJ of net energy was produced.