Waterlogging constitutes a severe agricultural hazard when the water table remains within _____ across the majority of the region:
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Answer: A. 5m
Explanation
A high water table within five meters of the soil surface saturates the root zone. Excessive moisture accumulation limits soil aeration and restricts deep root growth in crops. This shallow water table threshold defines serious agricultural waterlogging hazards across farm regions. Waterlogging occurs when irrigation or rainfall exceeds natural drainage capacity and soil evaporation. Anaerobic conditions develop rapidly in waterlogged soils, hindering nutrient uptake by roots. Subsurface drainage systems are often installed to lower high water tables and prevent crop failure.
Agricultural productivity in arid canal irrigated plains often declines due to regional waterlogging. Farmers monitor piezometers to track water table fluctuations and avoid hazardous saturation levels. Reclamation projects use tubewells to pump out excess groundwater and lower shallow water tables. Option B specifies a deeper six-meter threshold that is less immediately hazardous for crops. Option C proposes a seven-meter depth where soil aeration remains largely unaffected by groundwater. Option D suggests an eight-meter water table which poses virtually no risk of agricultural waterlogging.
- Subject
- Agriculture
- Category
- Forestry
- Topic
- —
- Difficulty
- medium
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