Definition:
The irrigation requirement is the water that must be supplied through the irrigation system to ensure that the crop receives its full crop water requirement. The Gross Irrigation Requirement (IRg) includes the losses not included under the Net Irrigation Requirement.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO-SAFR, 2002, Irrigation Manual Module 1, Irrigation Development: a Multifaceted Process, By: Andreas Savva & Karen Frenken