Definition
Sodicity is often discussed using exchangeable sodium percentage (ESP), sodium adsorption ratio (SAR) of water or related cation ratios. Unlike salinity alone, sodicity particularly threatens soil physical behaviour—dispersion, crusting and reduced permeability.
Why it matters
- Poor infiltration undermines irrigation efficiency and leaching.
- Structural decline is expensive to reverse once severe.
- Sodicity and salinity can co-exist and require joint interpretation.
Interpretation priorities
- Do not treat sodicity as a single-number diagnosis without cation and texture context.
- Look for physical symptoms: sealing, poor drainage, crusting.
- Connect findings to irrigation-water chemistry where available.
Management implications
- Address drainage and water quality before expecting amendment success.
- Coordinate soil interpretation with irrigation system review.
- Use professional validation for amendment programmes.
Evidence discipline
Distinguish measured values, user assumptions, calculated outputs and interpretation. See the data & evidence policy and scientific platform for Flaha's authority posture.
Related solutions
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