The 'consumptive use' of water by a crop is equivalent to:
Choose the correct answer
Only the water stored in plant cells
Total water lost by evapotranspiration (transpiration + soil surface evaporation) by the crop — equals crop water requirement
Seepage from irrigation canals
Rainfall only
Correct Answer
B. Total water lost by evapotranspiration (transpiration + soil surface evaporation) by the crop — equals crop water requirement
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Consumptive use (CU) = Evapotranspiration (ET) = water used by crops in transpiration + evaporation from soil surface. CU = ET crop reference × crop coefficient Kc. Measured by: lysimeter, water balance, Penman-Monteith. CU determines net irrigation requirement. CU for wheat in India ≈ 350–400 mm per season.
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