Discussion
Sub-irrigation is useful in a situation where?
Answer: C
The answer keyed is that sub-irrigation is useful where there is capillary movement in the root zone.
In sub-irrigation, water is applied below the surface, by raising the water table or through buried pipes, and reaches the roots by capillary rise. It works where the soil has good capillary movement into the root zone, a fairly permeable surface layer and an impervious layer below to hold the water table up.
Saline water is unsuitable, because water rising by capillarity and evaporating leaves salt at the surface. A heavy clay transmits water too slowly. And the absence of a hard pan is a drawback, since a hard pan below the root zone is what keeps the raised water table from draining away.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development