Definition:
Ratio entre l’eau efficacement utilisée et l’eau effectivement prélevée. En matière d’irrigation, l’efficience d’utilisation de l’eau représente le ratio entre les besoins estimés des plantes en eau (à travers l’évapotranspiration) et l’eau effectivement prélevée.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site