Irrigation Water Conveyance and Application Methods
Subtopic: Design of irrigation channels and underground pipelines
Question Statement:
Irrigation Water Conveyance and Application Methods: Design of irrigation channels and underground pipelines; irrigation scheduling; surface, sprinkler and micro irrigation methods, design and evaluation of irrigation methods; irrigation efficiencies.
A lateral has 12 sprinklers spaced 14 m apart in a sprinkler irrigation system. The laterals are spaced 20 m apart on the main line. If the recommended fertilizer dose is 80 kg/ha, the amount of fertilizer to be applied at each setting in kg (rounded to 2 decimals) is ______.
Official Answer Key:
26.87 to 26.89
Step-by-Step Solution & Explanation
Area irrigated by one lateral setting = (length covered by sprinklers along the lateral) × (lateral spacing).
Length along lateral = 12 sprinklers × 14 m spacing = 168 m.
Area per setting = 168 m × 20 m = 3360 m² = 0.336 ha.
Fertilizer per setting = dose × area = 80 kg/ha × 0.336 ha = 26.88 kg. Answer: within 26.87–26.89.
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