Review of measured crop water productivity values for irrigated wheat, rice, cotton and maize

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Investing in water for food, ecosystems, and livelihoods: an overview of the Comprehensive Assessment of Water Management in Agriculture. (2010, background): “5, found in highly productive rain-fed systems in Europe (Zwart and Bastiaanssen 2004).”
Application of AquaCrop model in deficit irrigation management of Winter wheat in arid region (2011, background): “Zwart and Bastiaanssen (2004) based on a review of 84 literature sources, reported that the range of WP of wheat was very large (0.6 to 1.7 kg m −3 ) and offered new water management practices, such as DI, with 20 to 40% less water application.”
Identifying the spatiotemporal changes of annual harvesting areas for three staple crops in China by integrating multi-data sources (2020, background): “Maize needs less water for irrigation and can provide the same production amount of wheat (Zwart and Bastiaanssen 2004).”
The water footprint of Tunisia from an economic perspective (2015, background): “…agricultural output to the amount of water consumed (‘crop per drop’), which is mostly expressed in either blue water withdrawal or total (green plus blue) water consumption through evapotranspiration (Kijne et al., 2003; Zwart and Bastiaanssen, 2004, 2007; Playan and Matoes, 2006; Molden, 2007).”
Water-use efficiency and productivity trends in Australian irrigated cotton: a review (2013, background): “Zwart and Bastiaanssen (2004) reviewed 84 studies on irrigated wheat, rice, cotton and maize.”