What is the formula for Residual Sodium Carbonate (RSC)?
Residual Sodium Carbonate indicates sodium hazard in irrigation water.
It is calculated using carbonate, bicarbonate, calcium and magnesium ions.
RSC = (CO₃²⁻ + HCO₃⁻) − (Ca²⁺ + Mg²⁺).
High RSC water leads to soil sodicity and poor soil structure.
It reduces infiltration and permeability of soils.
Thus option (a) is the correct formula.
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What is the formula for Residual Sodium Carbonate (RSC)?
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