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 area of crop Y that can be irrigated when the available capacity of irrigation system is 40 litres/sec is
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- 40 hectares
- 36 hectares
- 30 hectares
- 27 hectares
Correct Option: D
Moisture in 0.8 m = 0.8 × 18 = 14.4 cm
| Readily available moisture = | × 50 = 7.2 cm | |
| 100 |
| Frequency of irrigation = | = 18 days. | |
| 0.4 |
Quantity of water pumped is 10 h @ 40 L/s for 18 days
| = | m³ = 34560 mm³ | |
| 0.75 |
| = | = 34560 (104: hectares to m²) | |
| 100 |
∴ A = 27 hectares.
