Direction: The moisture holding capacity of the soil in a 100 hectare farm is 18 cm/m, the field is to be irrigated when 50 per cent of the available moisture in the root zone is depleted. The irrigation water is to be supplied by a pump working for 10 hours a day, and water application efficiency is 75%. Details of crops planned for cultivation area are as follows:
[2010, 2 marks each] 
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The capacity of irrigation system required to irrigate crop X in 36 hectares is
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- 83 litres/sec
- 67 litres/sec
- 57 litres/sec
- 53 litres/sec
Correct Option: B
Moisture holding capacity = 18 cm/m.
When moisture level is 250%, irrigation is required.
∴ Moisture held by soil = 9 cm/m
| Quantity of water = | (75% efficiency) = 43200 m³. | |
| 0.75 |
| Discharge of pump = | = 0.066 m³/s = = 66.6 L/s | |
| 18 × 10 × 60 × 60 |
