'Deficit irrigation' or 'deficit strategy' is practised when:
Choose the correct answer
Water is abundant and farmers over-irrigate
Water is scarce — applying less than full requirement at non-critical stages maximises water productivity across larger area
Only for sprinkler systems
When canal capacity exceeds crop demand
Correct Answer
B. Water is scarce — applying less than full requirement at non-critical stages maximises water productivity across larger area
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Deficit irrigation: applying less than full crop water requirement (ETc) to maximise water productivity (yield per unit water) when water is scarce. Crops are mildly stressed at non-critical stages (vegetative). Concept: marginal yield from last mm of water is low — better to irrigate 2 ha at 80% requirement than 1 ha at 100%. Used in arid/semi-arid water-scarce conditions.
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