A soil containing sufficient sodium to interfere with the growth of most crop plants having an exchangeable sodium percentage of 15 or more.

a salt-affected soil containing exchangeable sodium in an amount that impairs plant growth and significantly alters the soil's physical and chemical properties (SAR 13).

Those soils with high (over 6%) exchangeable sodium levels. They lead to soil structure breakdown, surface sealing and crusting.

Soil in which the structure has been affected by high concentrations of exchangeable sodium.

A soil with an exchangeable sodium percentage of 15 or greater in a saturation extract. This level of sodium will interfere with the growth of most plants.