ABSTRACT
Sodic soils, which occur naturally in many of the arid and semi arid regions of the world, exhibit poor chemical and physical properties. Soil management and farm operations are often difficult on these soils. Furthermore, farmers are frequently encouraged to use poorer quality saline–sodic wastewaters and groundwaters for irrigation, either alone or blended with surface waters, and this is leading to increased land area affected by sodicity. With increased use of saline–sodic irrigation water and its application to many soil types, farmers and scientists need to better understand the processes underpinning management of sodic soils for the maintenance or improvement of crop productivity.
