The chosen regions for this study are important in the irrigated citrus context both for its expansion and performance. Meteorological data used for estimates are components of the software IRRIPLUS® climatic database. Using this software, the daily reference evapotranspiration (ETo) was estimated for one-year period, applying proposed methodologies by Penman-Monteith (EToPM), Hargreaves & Samani (EToHG), and Blaney-Criddle-FAO (EToBC). The objective of this study was to compare EToPM estimate methods using regression parameters (β0, β1), determination coefficient (r²), correlation coefficient (r), standard error estimation (SEE), agreement index (d), and confidence index (c). The results indicated an EToHG tendency to overestimate ETo values, except for Jaú region, and an EToBC underestimate for all studied regions. All methods show the same distribution for monthly ETo values. The EToHG method is an excellent alternative for estimating the crop water consumption.
water consumption; Penman-Monteith; citrus
