to a potentially inaccurate ET 0 for irrigation scheduling. In this study, we investigated multiple ET 0 products from six meteorological stations, a satellite ET 0 product, and integration (merger) of two stations' data in Southern California, USA. We evaluated ET 0 against lysimetric ET observations from two lysimeter systems (weighing and volumetric) and two crops (wine grapes and Jerusalem artichoke) by calculating crop ET (ET c ) using crop coefficients for the lysimetric crops with the different ET 0 . ET c calculated with ET 0 products that incorporated field-specific wind speed had closer agreement with lysimetric ET, with RMSE reduced by 36 and 45% for grape and Jerusalem artichoke, respectively, with on-field anemometer data compared to wind data from the nearest station. The results indicate the potential importance of on-site meteorological sensors for ET 0 parameterization; particularly where microclimates are highly variable and/or irrigation water is expensive or scarce.

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