Quantifying crop water consumption is essential for many applications in agriculture. Evapotranspiration (ET) of coffee trees, cultivar IAPAR 59, under sprinkler and drip irrigation and no irrigation, were determined by weighing lysimeters in an experiment conducted in Londrina, Paraná State, Brazil, during two years after crop installation. The crop coefficient (Kc) values were determined for the irrigated treatments by the ratio between ET and reference evapotranspiration (ETo) estimated with the Penman-Monteith method. The values of ET and Kc were influenced by irrigation method, rainfall frequency, atmospheric demand and leaf area evolution. The sprinkler irrigated treatment presented the higher mean annual ET values (3.1 and 3.4 mm day-1 for the 1st and 2nd year, respectively), followed by drip irrigation (2.9 mm day-1 for the 2nd year) and no irrigation (2.2 and 2.5 mm day-1 for the 1st and 2nd year, respectively). The mean annual Kc value was higher under sprinkler (0.99 and 1.03 for the 1st and 2nd year, respectively) and lower for drip irrigation (0.92 for the 2nd year).
lysimeter; irrigation; Coffea arabica
