Getting back to you a little late...
I would suggest you and your son surf over to
http://www.qdma.com Quality Deer Management Association, register there, and post any questions. Food plotting, soils, seeds, habitat, equipment, deer management, wildlife biology, regional, global, and specific deer and site issues are discussed there. Many well recognized wildlife biologists and life-long dedicated deer managers will respond - quite a few from your "neck of the woods". The advice from the QDMA board is sincere.
Let us know if that works for you. Keep us up to date here as well.
Good luck. See you @ QDMA.