Most hazardous element in the irrigation water in relation to crop growth and production is
Show Hint
Sodium hazard is assessed using the Sodium Adsorption Ratio (SAR):
\( \text{SAR} = \frac{[Na^+]}{\sqrt{\frac{[Ca^{++}] + [Mg^{++}]}{2}}} \).
High SAR water causes soil sodicity and structure collapse.