Large-Scale Spatial and Temporal Variability in Evapotranspiration, Crop Water-Use Efficiency, and Evapotranspiration Water-Use Efficiency of Irrigated and Rainfed Maize and Soybean

AbstractQuantification of long-term trends and magnitudes of actual crop evapotranspiration (ETc) and crop water productivity [CWP, also known as crop water use efficiency (CWUE)], especially in relation to interannual variation in climate, is critical to determine whether current crop, soil, and irrigation management practices are effective in water conservation and enhancing CWUE. This research quantified and mapped long-term spatio-temporal variability in CWUE, evapotranspiration water use efficiency (ETWUE) and environmental variables associated with it at regional scales for maize (Zea mays L.) and soybean [Glycine max (L.) Merr.] producing counties in Nebraska, from 1986 to 2009. Declining trends were observed in seasonal and annual reference (potential) evapotranspiration (ETref) and irrigated and rainfed maize and soybean ETc. About 15 and 64 mm reduction in seasonal and annual ETref, respectively, were observed from 1986 to 2009 with maximum reduction of 284 mm observed in Zone 4 (eastern subhumi...

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