Question

237. The following data were recorded from all irrigated field : 1. Field capacity: 20% 2. Permanent wilting point : 10% 3. Permissible depletion of available soil moisture : 50% 4. Dry unit weight of soil : 1500 kgf/m' 5. Effective rainfall : 25 mm Based on these data, the net irrigation requirement per metre depth of soil will be a) 75 mm b) 125 mm c) 50 mm d) 25 mm ​

Answer 1

The net irrigation requirement per metre depth of soil will be 50 mm.

Explanation:

Readily available moisture = 0.5 (20-10) = 5 %

Deficiency due to the fall of moisture = rd/ rw x dx (readity available moisture)

                                             = 1500 / 1000 x 100 x 0.05

                                             = 75 mm

Net irrigation needed = 75 mm - 25 mm

                                    = 50 mm

Thus the net irrigation requirement per metre depth of soil will be 50 mm.

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