Definition:
Valeur d’une culture pratiquée par unité d’eau d’irrigation, si la culture est irriguée de manière permanente pendant toute sa croissance.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO/IPTRID/ICID/ODA, 2000, Irrigation Guidelines, Land and Water Digital Media Series 12, & FAO, 2000, Handbook on Pressurized Irrigation Techniques