Pereira, L.S.2011-09-212011-09-2120072-85352-355-1http://hdl.handle.net/10400.5/3539Water productivity became an important issue in improving the performance of irrigation, includind when focusing water saving issues. This calls for a discussion relative to its concepts and computation, thus to identify both how crop evapotranspiration may be managed to improve water productivity and existing gaps in its knowlwdge. In addition, a discussion on the economic aspects relative to improved water productivity and saving is presented, including a simple analysis of economic issues and respective gaps in knowledgeengwater productivityland productivityevapotranspirationaerodynamic resistancesurface resistancecrop coefficientsstress coefficientsconference object