Correct Answer - Option 1 : Soil temperature falls
Concept:
Waterlogging:
Waterlogging is the saturation of soil with water. Soil may be regarded as waterlogged when it is nearly saturated with water much of the time. It can happen when the water table rises to the extent that the soil pores in the crop root zone. The result is a restriction in the normal supply of air in the soil, a decline in the levels of oxygen, and an increase in the levels of carbon dioxide and ethylene.
Causes of Waterlogging:
- Inadequate drainage of over-land run-off increases the rate of percolation and in turn, helps in raising the water table.
- The water from rivers may infiltrate into the soil.
- Seepage of water from earthen canals also adds a significant quantity of water to the underground reservoir continuously.
- Irrigation water is used to flood the fields. If it is used in excess it may help appreciably in raising the water table. Good drainage facility is very essential.
Effects of Waterlogging:
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Creation of Anaerobic Condition in the Crop Root-Zone.
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Growth of Water Loving Wild Plants.
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Falling of soil temperature
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Accumulation of Harmful Salts
Preventive Measures:
- Controlling the loss of water due to seepage from the canals.
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By lowering the FSL of the canal.
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By lining the canal section.
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By introducing intercepting drains.