Definition:
Volume d’eau total nécessaire pour l’évapotranspiration et la construction cellulaire, du semis ou de la plantation à la moisson pour une culture donnée et dans un régime climatique particulier, lorsque l’eau du sol est maintenue à un niveau adéquat par les pluies et/ou l’irrigation, de façon à ne restreindre en rien la croissance des plantes ou le rendement des cultures.
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