According to WAPDA guidelines, what are the recommended values of EC, SAR, and RSC for third-class irrigation water (C, S, R)?

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EC less than 1.5 dS/m, SAR below 10, and RSC under 2.5 meq/LEC exceeding 1.5 dS/m, SAR higher than 10, and RSC greater than 2.5 meq/LEC above 1.5 dS/m, SAR equal to 2.5, and RSC not specifiedBoth options A and BNo values specified

Explanation

The Water and Power Development Authority (WAPDA) specifies that for third-class irrigation water, the Electrical Conductivity (EC) should be below 1.5 dS/m, the Sodium Adsorption Ratio (SAR) should be less than 10, and the Residual Sodium Carbonate (RSC) must be under 2.5 meq/L to ensure water is suitable for irrigation purposes.