The only reason I would spray at this time is if the field was heavy with grass. If it is then spray and wait about 2 weeks and then do the heavy disc followed in a week or so with a lighter disc till the ground is in better shape. It takes about 6 months for lime to help out, but you could put 2 1/2 tons per acre or more (this is just a guess as you didn't test) and disc it in and you would have a good start for next year. You would need to talk to someone in your area about what to plant, I like Buck Forage Oats planted with a grain drilland then over seed with a white clover.