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Remote sensing-based tools allow the monitoring of water budgets over different spatial and temporal resolutions. Nevertheless, some models require in situ data, preventing their application in areas with a lack of data. To address this challenge, this work presents an approach for irrigation scheduling, based on soil water budget estimation using actual evapotranspiration (ETA) obtained using MSI/SENTINEL-2 multispectral images and data from a public meteorological station. The study area consisted of a central pivot located in the municipality of Itatinga-SP, Brazil. For decision-making of irrigation scheduling, considering a fixed irrigation rate, the evapotranspiration fraction was interpolated between the days with available images to obtain the ETA on the days without images using its product with the reference evapotranspiration. This approach captured essential climate variations for estimating the water budget on non-image days. Noteworthy in this joint application is its suitability to be performed not requiring crop-, microclimate-or relief-specific parameters, making it useful for regions with a lack of data.

Departamento de Engenharia Rural Faculdade de Ciências Agronômicas Universidade Estadual Paulista, Avenida Universitária, n° 3780, Altos do Paraíso São Paulo

Departamento de Engenharia de Biossistemas Faculdade de Ciências e Engenharia Universidade Estadual Paulista “Júlio de Mesquita Filho”, Rua Domingos da Costa Lopes, 780 SP

Departamento de Engenharia Rural Faculdade de Ciências Agronômicas Universidade Estadual Paulista, Avenida Universitária, n° 3780, Altos do Paraíso São Paulo

Departamento de Engenharia de Biossistemas Faculdade de Ciências e Engenharia Universidade Estadual Paulista “Júlio de Mesquita Filho”, Rua Domingos da Costa Lopes, 780 SP