Agricultural Drainage

Calculate the Sodium Adsorption Ratio ($SAR$) of irrigation water having cation concentrations of $\text{Na}^+ = 9.0\text{ meq/L}$, $\text{Ca}^{2+} = 3.0\text{ meq/L}$, and $\text{Mg}^{2+} = 5.0\text{ meq/L}$ using $SAR = \frac{\text{Na}^+}{\sqrt{(\text{Ca}^{2+} + \text{Mg}^{2+})/2}}$.