I agree with the spray heavy suggestion from gonewest. I would also pull a soil sample and send it in for analysis. Another option for this year would be to plant buckwheat in the spring after spraying to build soil and keep the weeds down. Spray the buckwheat with roundup in mid-July type time frame, and then you could plant oats, peas and oats, winter rye, or brassicas this late summer. Since you are experimenting this year, maybe try a few different fall options to see what the deer like best if it fits your budget.