One thing that I like about Bermuda is that it holds sandy soil very well and is worth nearly as much as Alfalfa when put into bales. Crab makes good hay too and there are a lot of farmers around here planting crab in the Wheat fields to get a hay crop after cutting the wheat and to keep soil erosion down. Crab doesn't choke out the Wheat and it will survive a good discing.
A guy I knew said to space garden rows far enough apart to mow between. There are some things that can be planted as a living mulch. They will help modulate soil temp and also hold moisture due to their shading effect.
I don't plant in rows at all I intensive plant and use the plants themselves as living mulch. I also interplant several kinds together. Like tall things then plant a shorter something that likes a little extra protection from the hot sun just to the east of the tall one. When my beds are finished getting through them is an exersice in advanced yoga, but it keeps me young and flexible! lol