Definition:
Water productivity is an efficiency term quantified as a ratio of product output (goods and services) over water input. The output could be biological goods or products such as crop ( grain fodder) or livestock (meat, egg, fish) and can be expressed in term of yields, nutritional value or economic return. The output could also be an environment service or function. Water productivity can be at different scales and for a mixture of goods and services.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO, 2001, FAO methodologies on crop water use and crop water productivity presented at the expert meeting on crop water productivity, Rome , 3 to 5 December 2001. By: Amir Kassam & Martin Smith