Irrigation Water Conveyance and Application Methods
Subtopic: Surface, sprinkler and micro irrigation methods
Question Statement:
In a citrus orchard, planting is done at a spacing of 5 m × 5 m. The daily pan evaporation of the orchard is 6 mm. The pan coefficient, wetting factor (crop canopy factor) and crop coefficient are 0.8, 0.6 and 0.6, respectively. Four drippers each of 4 L h⁻¹ discharge are used to irrigate each plant. The time of operation of drip irrigation system in hours will be
Options:
(A) 2.7
(B) 4.5
(C) 16.2
(D) 19.8
Official Answer Key:
A
Step-by-Step Solution & Explanation
Crop evapotranspiration, ET_c = (pan evaporation)×K_p×K_c = 6×0.8×0.6 = 2.88 mm/day.
Area per plant = 5×5 = 25 m².
Daily water volume required per plant = ET_c × (area per plant) × (wetting factor) = 0.00288 m × 25 m² × 0.6 = 0.0432 m³ = 43.2 L/day.
Discharge from all 4 drippers per plant = 4 × 4 = 16 L/h.
Operating time = 43.2/16 = 2.7 h. Answer: (A).
Agricultural Drainage
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