A soil containing sufficient soluble salts to interfere with its productivity but not with excessive sodium. The conductivity of a saturation extract is greater than 4dS/m, an exchageable sodium percentage (ESP) of less than 15 and the pH is usually less than 8.5.

A nonalkali soil containing soluble salts in such quantities that they interfere with the growth of most crop plants. The conductivity of the saturation extract is greater than 4 dS/m, the exchangeable sodium percentage is less than 15, and the pH is usually less than 8.5.

A soil containing a high enough concentration of soluble salts to interfere with crop growth.