'Waterlogging' in irrigated areas is caused by:
Choose the correct answer
Insufficient irrigation water
Excessive water (irrigation + seepage) raising water table to root zone — aggravated by flat terrain and poor drainage
Very deep water table
Drought conditions
Correct Answer
B. Excessive water (irrigation + seepage) raising water table to root zone — aggravated by flat terrain and poor drainage
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Waterlogging: when water table rises to within 1.5–2.0 m of ground surface (crop root zone affected). Causes: (1) Excessive irrigation water applied; (2) Canal/watercourse seepage; (3) Flat land with no natural drainage; (4) Impermeable layer at shallow depth; (5) Percolation from upstream. Effects: reduced crop yield, soil salinisation (capillary rise brings salts to surface), vector-borne diseases.
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