I have not had any experience with soil like that myself. Here is southern Indiana it doesn't take much to grow a food plot. A good wet year like this and we have plants coming out our ears.

Just from what I know about food plot seeds I would think that Whitetail Institute's Extreme would be great for a location like that. http://www.whitetailinstitute.com/products/extreme/It says that it will do well in sandy soil with little rainfall. Maybe someone else has had a little more experience with this and can give youa first hand account that this stuff works. From what Whitetail Institute says this stuff should work for you.

Hopes this helps you out.