Crop evapotranspiration (ET) was determined by field soil water balance and reference evapotranspiration (ETo) was obtained based on Penman–Monteith method (FAO/56), using data of air temperature, relative humidity, wind speed and solar radiation from Data Collection Platform, located next to the experimental site. The experimental area was cultivated with
irrigation applied weekly by a center pivot system in addition to rainfall. The irrigation scheduling was
based on four irrigation levels (T1 = 25%, T2 = 50%, T3 = 75% and T4 = 100% of ETo). Results showed that ET
and WUE are strongly influenced by soil water availability. When averaged across two years, productivity
increased according to increases in water level. Sugarcane ET ranged from 2.7 (rain-fed condition) to
4.2 mm day−1 (100% ETo irrigation treatment)