USDA class

Electrical conductivity range (mS/cm)

Crop salt tolerance

Example Crop

A

0 - 2

Sensitive

Bean, strawberry, carrot, onion, citrus

B

2 - 4

Moderately sensitive

Corn, cucumber, tomato

C

4 - 8

Moderately tolerant

Wheat

D

8 - 16

Tolerant

Barley