Partridge pea is a perrenial, once you start it, you have it forever.That said, you will want to keep your perrenial plants seperate from your annuals (like soybeans).
I still contend that any soybean will do.For what you are doing, I'd also recommend egyptian wheat or any tall grain sorghum. And plenty of stickweeds. BTW I'm betting you have wild partridge pea growing in the field.
http://www2.ic.edu/prairie/partridge_pea.htm
By the way, a weed field field with all of these plants listed is excellent quail habitat in your area(exept for the thistles and cockleburs).Remember that if you want permanent breeding quail populations, you need to kill the fescue and Bermuda grass in the area!!!
Congrats on picking up this sport-you will be hooked.
