This study focused on the quantification of irrigation water requirements (IWRs) to improve water use efficiency in agriculture. The CropWat software based on FAO Penman - Monteith (FAO-PM) model was used to estimate reference evapotranspiration, ETo, using climate data for a period of 25 years (1995-2020). For 6 different crops grown in the study area, the NIR (Net Irrigation Requirement) and GIR (Gross Irrigation Requirement) were calculated through Ea (application efficiency) method. Modelling work was complemented with field experimentation. Results show that in the case of olives, when converting from gravity to drip irrigation, production increased by 56%. Instead, for greenhouse cultivated tomatoes productivity increased by 67%. The results obtained were examined with local farmers.