Irrigation Method - Subsurface Irrigation

Subsurface Irrigation


In this method of irrigation, water is applied below the ground surface by maintaining an artificial water table at some depth depending upon the soil texture and the depth of the plant roots. Water reaches the plant roots through capillary action. Water may be introduces through open ditches or underground pipe lines such as tile drains or mole drains. The depth of open ditches or tranches varies from 30 to 100 cm and are spread about 15 to 30 cm apart.

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Suitability

                It is suited to soils having reasonably uniform texture and permeable enough for water to move rapidly both horizontally and vertically within and for some distance below the crop rootzone. The soil profile must also contain barrier against excessive losses through deep percolation, either a nearly impermeable layer in the substratum when artificial water table can be maintained throughout the growing season. Topography must be smooth and level.


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