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Question

In an irrigation system, water was delivered to the field in ditches spaced about 30 m apart and was allowed to seep into the ground to maintain the water table at such a height that the water is available to the crops through the capillary fringe. This method of irrigation is called

A
Trickle irrigation
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B
Furrow irrigation
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C
Border irrigation
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D
Sub-surface irrigation
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Solution

The correct option is D Sub-surface irrigation
Sub-surface irrigation - In this method, water is applied beneath the land surface. The subsurface irrigation can be classified as
  • Natural subsurface irrigation: Leakage water from sources of water such as streams, lakes, ponds, canals, etc. goes underground and during the passage to the subsoil, it may irrigate crops by capillarity.
  • Artificial subsurface irrigation: In this method, water is applied beneath the land surface through a network of buried perforated or open jointed pipes. As water is passed under pressure in these pipes, it comes out through open joints. Evaporation losses are reduced.

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