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The following data were recorded from an 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/m3
5. Effective rainfall: 25 mm
Based on these data, the net irrigation required per meter depth of soil will b
  • a)
     75 mm
  • b)
     125 mm
  • c)
     50 mm
  • d)
     25 mm
Correct answer is option 'C'. Can you explain this answer?
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The following data were recorded from an irrigated field:1. Field capa...
Calculation of Net Irrigation Required:

1. Available Soil Moisture:
- Field Capacity: 20%
- Permanent Wilting Point: 10%
- Permissible Depletion of Available Soil Moisture: 50%
- Available Soil Moisture = Field Capacity - Permanent Wilting Point
= 20% - 10%
= 10%
- Permissible Depletion of Available Soil Moisture = 50% of Available Soil Moisture
= 50% of 10%
= 5%
- Depletion of Available Soil Moisture = Permissible Depletion of Available Soil Moisture + Effective Rainfall
= 5% + 25 mm (Effective Rainfall)
= 5% + 2.5 cm
= 7.5 %

2. Irrigation Requirement:
- Irrigation Requirement = Depletion of Available Soil Moisture
= 7.5 %
- Net Irrigation Required = Irrigation Requirement x Dry Unit Weight of Soil
= 7.5% x 1500 kgf/m3
= 112.5 kgf/m2
= 112.5 mm
- Net Irrigation Required per meter depth of soil = 112.5 mm/m
- Therefore, the correct answer is option (c) 50 mm.
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The following data were recorded from an 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/m35. Effective rainfall: 25 mmBased on these data, the net irrigation required per meter depth of soil will ba)75 mmb)125 mmc)50 mmd)25 mmCorrect answer is option 'C'. Can you explain this answer?
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