Field application efficiency (Ea) in irrigation represents:
Choose the correct answer
Water lost to evaporation from canal surface
Ratio of water stored in crop root zone to water delivered at field inlet
Canal conveyance efficiency
Efficiency of pump in lifting water
Correct Answer
B. Ratio of water stored in crop root zone to water delivered at field inlet
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Field application efficiency Ea = (water stored in root zone / water delivered to field) × 100%. Losses include: deep percolation below root zone, surface runoff, and evaporation. Typical Ea: surface irrigation 50–70%, sprinkler 75–85%, drip 90–95%. Net irrigation requirement = gross irrigation / Ea.
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