Subtopic: Irrigation and drainage water quality and reuse
Question Statement:
A chemical analysis of irrigation water shows cation concentrations of $\text{Na}^+ = 18.0\text{ meq/L}$, $\text{Ca}^{2+} = 5.0\text{ meq/L}$, and $\text{Mg}^{2+} = 3.0\text{ meq/L}$. The Sodium Adsorption Ratio ($SAR = \frac{[\text{Na}^+]}{\sqrt{\frac{[\text{Ca}^{2+}] + [\text{Mg}^{2+}]}{2}}}$) in $(\text{meq/L})^{0.5}$ is ________ (answer in integer).