“…According to Mantovani et al (2009), based on PAS and PAM, make necessary a correction which reduces the evapotranspiration of culture (ETc), by reducing the direct evaporation from the soil of the area wet. Despite the complexity of the process, in simplified form, the evapotranspiration set can be represented by the following equation: (5) on what, ETcA -evapotranspiration of culture adjusted, mm dia -1 , and KL -correction factor due to location, depending on the stage of development of culture, the spacing, the wet area and shaded area, dimensionless.…”