Desenvolvimento do aplicativo “EToCALC 1.0” para estimar a evapotranspiração de referência

Abstract

Evapotranspiration is the simultaneous process of water transfer to the atmosphere by evaporation of soil water and transpiration of plants. Its definition is of fundamental importance because it establishes the water consumption by the plants and, consequently, the irrigation depth to be applied by the system. It can be obtained by different methods, directly or indirectly. The present work aimed to develop an application using web software App Inventor 2 that has the function of creating applications executable on Android systems, such application aims to estimate the reference evapotranspiration. The mathematical model used to compose the calculation routines present within the application was the Penman-Monteith equation, established as a standard method in FAO Bulletin 56. For the validation of the EToCALC 1.0 application, the data estimated by the EvapoCalc application, available from Play Store, the data generated by the FAO Land and Water Division ETo Calculator software and data provided by Embrapa Agropecuária Oeste, located in the Dourados region. For this validation we use the daily data from September 2019 as reference: The values of the evapotranspiration estimates obtained by EToCALC 1.0 were identical to those obtained with the EvapoCalc application, when compared to those estimated by ETo Calculator and those provided by Embrapa. visibly close.