They grow corn in wide rows down in Texas where they still use ditch irrigation. I think it also works well with traditional cotton row width though I hear that is changing. They list or middlebust the fields to create ditches for waterflow or collect moisture in some areas. These areas generally don't use circle irrigation. Some neighboring areas in neighboring states like OK, KS, or CO may still have some wide rows were the irrigation systems are older (not sure). Remember seeing 36"inch rows in Nebraska. One of the local mechanics said it originated to correspond with the 36" potato rows of many years ago. Interesting at that time there were 5 row corn heads in some of those rolling areas or E. Nebraska, which at times can be fairly steep for the midwest. Some of those may have been row crop heads for sorghums etc.