📄 Management of Saline Soils
Management of saline soils — leaching, drainage, salt-tolerant crops, and bio-drainage.
Effective saline soil management combines leaching, drainage, and crop planning to maintain productivity under salt stress.
Principles of Reclamation
The management of saline soils aims to remove excess soluble salts from the root zone and prevent their re-accumulation. Since saline soils have good physical structure (unlike sodic soils), the primary approach is leaching — washing salts below the root zone with good quality water, provided adequate drainage exists.
Leaching
Leaching is the most effective method for reclaiming saline soils. It involves applying excess water to dissolve the accumulated salts and move them below the root zone through the soil profile.
Leaching Requirement (LR)
The leaching requirement is the fraction of irrigation water that must pass through the root zone to maintain salinity below a threshold:
LR = EC_iw / EC_dw
Where EC_iw is the electrical conductivity of irrigation water and EC_dw is the maximum permissible EC of drainage water for the crop being grown.
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Effective saline soil management combines leaching, drainage, and crop planning to maintain productivity under salt stress.
Principles of Reclamation
The management of saline soils aims to remove excess soluble salts from the root zone and prevent their re-accumulation. Since saline soils have good physical structure (unlike sodic soils), the primary approach is leaching — washing salts below the root zone with good quality water, provided adequate drainage exists.
Leaching
Leaching is the most effective method for reclaiming saline soils. It involves applying excess water to dissolve the accumulated salts and move them below the root zone through the soil profile.
Leaching Requirement (LR)
The leaching requirement is the fraction of irrigation water that must pass through the root zone to maintain salinity below a threshold:
LR = EC_iw / EC_dw
Where EC_iw is the electrical conductivity of irrigation water and EC_dw is the maximum permissible EC of drainage water for the crop being grown.
Methods of Leaching
- Continuous ponding — flooding the field with water for extended periods; effective but uses large volumes of water
- Intermittent ponding — alternating cycles of ponding and draining; more efficient as it allows salt diffusion from aggregates during dry periods
- Sprinkler leaching — applying water through sprinklers; useful where flooding is impractical
Drainage
Adequate drainage is essential for successful leaching. Without drainage, salts accumulate in lower soil layers and may return to the root zone through capillary rise.
- Surface drainage — removal of excess surface water through field ditches and drains
- Subsurface drainage — installation of perforated pipes (tile drains) or open ditches at 1–2 m depth to lower the water table and remove saline drainage water
- Vertical drainage — pumping saline groundwater through tubewells to lower the water table
The Central Soil Salinity Research Institute (CSSRI), Karnal, has developed sub-surface drainage technology that has been successfully demonstrated across thousands of hectares in Haryana, Rajasthan, and other states.
Salt-Tolerant Crops
Growing salt-tolerant crops and varieties is a practical and economical approach, especially where complete reclamation is not feasible:
| Tolerance Level | Crops |
|---|---|
| Highly tolerant | Barley, cotton, sugar beet, date palm, asparagus |
| Moderately tolerant | Wheat, sorghum, sunflower, safflower, mustard |
| Sensitive | Rice, maize, groundnut, most pulses, citrus |
Salt-tolerant varieties developed in India include CSR-30, CSR-36, and CSR-43 (rice), KRL-210 and KRL-213 (wheat), and CSR-1 and CSR-2 (mustard).
Bio-Drainage
Bio-drainage uses transpiration by deep-rooted, high water-consuming tree species to lower the water table and reduce salinity. Species such as Eucalyptus, Casuarina, Prosopis juliflora, Salvadora persica, and Tamarix are planted along field boundaries, canal banks, or in block plantations. Bio-drainage is an eco-friendly, low-cost alternative to engineered drainage, particularly effective in waterlogged saline areas. It also provides timber, fuelwood, and other economic benefits to farmers.
Summary Cheat Sheet
Key Recall Points
- Reclamation succeeds only when salts are moved below root depth and prevented from returning upward.
- Leaching must be paired with drainage for sustained salinity control.
- Use salt-tolerant crops and irrigation-water quality checks during transition years.
Exam Traps
- More irrigation alone is not reclamation; unmanaged drainage can worsen salinity-waterlogging cycles.
- Saline-soil management differs from sodic-soil management where chemical amendments dominate.
- Bio-drainage supports water table control but is not a complete substitute for engineered drainage everywhere.
References
3 sources • [1] [2] [3]
References
CSSRI Guidelines on Saline Land Reclamation
OfficialICAR Salt-Affected Soil Management Packages
OfficialReclamation Practices in Soil Science Textbooks
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