Q.4
Which type of crust is found in sodic soils?
EXPLANATION
Soil Structure, Aggregate Stability, Bulk/Particle Density, Porosity & Crusting Mechanics in Sodic Soils
- Sodic Soil Crust Formation: Sodic soils possess high exchangeable sodium ($ESP \gt 15\%$) and low electrolyte concentration, which weakens bonding between clay platelets.
- Slaking Crust: Upon wetting with rainfall or irrigation, rapid aggregate disintegration (slaking) occurs alongside spontaneous physico-chemical dispersion of clay particles. The dispersed fine particles plug soil macropores and dry out into a hard, dense, impermeable slaking crust. (Correct answer: Option 2)
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