Causes and visible symptoms of soil salinity
Salinization occurs due to natural mineral weathering combined with inappropriate agricultural practices.
Key causes and field indicators:
- Canal waterlogging: Intensive canal irrigation without adequate sub-surface drainage raises shallow saline water tables.
- Saline groundwater: Prolonged pumping and irrigating with brackish tube-well water with high electrical conductivity (EC).
- White salt crusts: White or grey salt efflorescence visible on the soil surface during dry periods.
- Plant symptoms: Marginal leaf scorching, stunted growth, leaf chlorosis, poor germination, and patchy crop stands.
Soil testing and salinity parameters
Laboratories analyze soil saturation extracts to classify salt-affected soils.
Critical diagnostic parameters:
- Saline soil: Electrical Conductivity (EC) greater than 4 dS/m, Exchangeable Sodium Percentage (ESP) below 15%, and pH below 8.5.
- Alkali / Sodic soil (Kshariya mitti): pH greater than 8.5, ESP above 15%, causing dispersed, impermeable soil structure.
- Saline-sodic soil: Elevated EC and high ESP, requiring chemical amendments followed by leaching.
Reclamation methods and salt-tolerant crops
Reclaim sodic soils by applying mineral gypsum (calcium sulfate) or agricultural phospho-gypsum based on Soil Health Card recommendations, followed by deep flooding to leach displaced sodium below the root zone. Farmers can cultivate salt-tolerant crop varieties developed by ICAR-CSSRI, such as CSR-30 and CSR-36 rice, or KRL-210 wheat.
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Common questions
What is the meaning of soil salinity in Hindi?
Soil salinity is referred to as 'mitti ki lavanata' or 'usar/reh mitti', indicating an excess concentration of soluble salts in the soil.
How does gypsum reclaim saline-alkali soils?
Gypsum provides soluble calcium ions that displace harmful sodium ions from clay particles, restoring soil porosity and allowing salts to leach away.
Which institute specializes in soil salinity research in India?
The ICAR-Central Soil Salinity Research Institute (CSSRI) in Karnal, Haryana, leads national research on salt-affected soil management.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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