Team Organic Mandya ·
Saline and Alkaline Soil Reclamation for Organic Farming
Saline and alkaline soils (called usar, kshar, or reh in different Indian regions) are among the most challenging land types to reclaim — but with the right organic approach, significant recovery is achievable in 2–3 years. India has approximately 6.7 million hectares of salt-affected land, concentrated in UP, Rajasthan, Gujarat, coastal areas, and canal command zones. These soils have excess sodium (saline) or sodium carbonate (alkaline) that blocks nutrient uptake, damages soil structure, and makes most crops impossible to grow. Organic reclamation combines gypsum (to replace sodium), leaching (to flush sodium out), organic matter (to improve biology and structure), and strategic salt-tolerant cropping.
pH 8.5+
When soil becomes alkaline — most crops fail at pH above 8.5; only salt-tolerant crops viable
Gypsum
Key reclamation amendment — replaces sodium with calcium; the first treatment for alkaline soil
2–3 years
Timeline for significant saline/alkaline soil improvement with sustained organic treatment
Dhaincha
Best green manure for saline soil reclamation — salt-tolerant, nitrogen-fixing, fast-growing
What Is the Difference Between Saline and Alkaline Soil?
| Type | Scientific Name | pH | EC | Problem | Key Amendment |
|---|---|---|---|---|---|
| Saline soil | Solonchak | Below 8.5 | Above 4 dS/m | Excess soluble salts (sodium chloride, sulphate) — osmotic stress, roots cannot take up water | Leaching with fresh water; drainage improvement |
| Alkaline (sodic) soil | Solonetz / Usar | Above 8.5 | Below 4 dS/m | Excess exchangeable sodium (ESP >15%) — poor structure, hard setting, low permeability | Gypsum + leaching |
| Saline-alkaline | Saline-sodic | Above 8.5 | Above 4 dS/m | Both problems combined — most difficult to reclaim | Gypsum + leaching + organic matter over 3+ years |
Identifying your problem:
- White crystalline crust on soil surface: saline
- Hard, dark, puffy soil that sets like concrete when dry: alkaline (sodic)
- Both: saline-alkaline
- Lab test confirms: send soil sample to ICAR regional centre or soil testing lab for full analysis including pH, EC, ESP
What Is the Gypsum Treatment Protocol?
Gypsum (calcium sulphate) is the primary chemical amendment for alkaline/sodic soils. It works by exchanging calcium for sodium — sodium moves into soil solution and can be leached out with irrigation.
Gypsum application:
- Get a soil test to determine the Gypsum Requirement (GR) — labs calculate this based on ESP (exchangeable sodium percentage)
- Typical application: 2–5 tonnes per acre (higher for severely alkaline soils)
- Spread gypsum evenly over soil surface
- Incorporate into top 15 cm with a cultivator or rotovator (the one occasion where tillage helps)
- Irrigate heavily (flood irrigation) to leach sodium-rich water downward and out through drainage
- Do not plant for 2–4 weeks after gypsum treatment + leaching
Gypsum cost: ₹1,500–2,500 per tonne; ₹3,000–12,500 per acre depending on severity
Important: Gypsum is a soil amendment, not fertiliser. It corrects the sodium problem but does not add fertility — organic matter addition must follow.
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Year 1 — Gypsum correction + salt-tolerant green manure:
- Apply gypsum and leach as above
- After 3–4 weeks, sow Dhaincha (Sesbania bispinosa) — the most salt-tolerant nitrogen-fixing green manure
- Dhaincha grows even at EC 4–8 dS/m — it is virtually the only crop that establishes well in heavily salt-affected soil
- Incorporate Dhaincha at flowering (55–65 days) — adds 15–20 tonnes green matter per acre, 90–100 kg nitrogen
- Apply Jeevamrutha immediately after incorporation — inoculates soil with fresh biology
Year 2 — Organic matter building + broader cropping:
- After Dhaincha incorporation, test soil again — EC and pH should have dropped significantly
- Apply 5 tonnes compost per acre
- Plant barley, berseem, or sugarbeet (moderately salt-tolerant crops) as second reclamation crop
- Continue applying Jeevamrutha every 15 days
- Sow another Dhaincha cycle if EC still above 3 dS/m
Year 3 — Transition to full farming: Most soils with consistent treatment reach pH 7.5–8.0 and EC below 2 dS/m by Year 3, enabling most vegetable and field crop production.
Which Crops Tolerate Saline/Alkaline Conditions?
| Crop | Salt Tolerance (EC dS/m) | Notes |
|---|---|---|
| Dhaincha (Sesbania bispinosa) | Up to 8 dS/m | Best reclamation green manure; nitrogen-fixing; grows where nothing else does |
| Barley | Up to 8 dS/m | Most salt-tolerant cereal; excellent Year 1 income crop on reclaiming land |
| Sugarbeet | Up to 7 dS/m | Commercial crop tolerant of saline soils; sugar extraction possible at farm scale |
| Spinach (palak) | Up to 6 dS/m | Moderate tolerance; good early vegetable on partially reclaimed soil |
| Tomato | Up to 4 dS/m | Moderate tolerance; start tomato in Year 2 after partial reclamation |
| Cauliflower, cabbage | Up to 3 dS/m | Limited tolerance; plant only after Year 2 reclamation |
| Beans, groundnut | Up to 2 dS/m | Low tolerance; grow only on well-reclaimed soil in Year 3 |
| Most vegetables | Below 2 dS/m | Standard vegetables require near-normal soil conditions |
Use Saline Water for Leaching — Carefully
Many salt-affected areas also have saline irrigation water (EC 2–4 dS/m). Using saline water to leach saline soil seems counterproductive, but it can work if you apply large quantities and ensure proper drainage out of the field. The key: leach water must have a lower sodium adsorption ratio (SAR) than the soil — even slightly saline water can flush worse salinity if it drains out. However, if your irrigation water EC is above 3 dS/m, leaching with it will make things worse, not better. Always test your irrigation water before attempting saline soil reclamation — both soil and water tests are needed.
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