Question Statement:
A saline-alkali (saline-sodic) soil is formally classified by which of the following criteria?
Options:
- (A) $EC_e > 4\text{ dS/m}$, $ESP > 15\%$, and $pH < 8.5$
- (B) $EC_e < 4\text{ dS/m}$, $ESP > 15\%$, and $pH > 8.5$
- (C) $EC_e > 4\text{ dS/m}$, $ESP < 15\%$, and $pH < 8.5$
- (D) $EC_e < 2\text{ dS/m}$, $ESP < 5\%$, and $pH = 7.0$