This CRDC-funded project is studying the effect of repeated wet/dry cycles, with drying by rotation crops, on the structure repair of a black, cracking clay. The cotton industry knows that the majority of its soils (cracking clays) respond to wet/dry cycles, to repair structure. Past studies succeeded in showing soil structure repair of the topsoil by repeated wetting/drying where the drying was solely by evaporation. Other field studies have examined the role of rotation crops in drying the soil profile to prevent compaction in subsequent cultivation