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Question

The data for an agricultural field for a specific month are given below:
Pan Evaporation = 100 mm
Effective Rainfall = 20 mm (after deducting losses due to runoff and deep percolation)
Crop Coefficient = 0.4
Irrigation Efficiency = 0.5
The amount of irrigation water (in mm) to be applied to the field in that month, is

A
80
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B
40
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C
20
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D
0
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Solution

The correct option is B 40
Cu=K× pan evaporation
Cu=0.4×100= 40 mm
CIR = 40 - 20 = 20 mm
FIR =200.5= 40 mm
hence option B correct.

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