I would start dealing with the pH first. Hit the plots with as much pelletized lime as you can afford this year and plant them this Fall with a mix of the cheapest wheat, generic feed oats and any white (Ladino) clover you can get from local feed stores. If you have the $$$ for some fertilizer, add the highest P & K mix available (something like 6-24-24). That should give you usable plots this year, and you can improve on them next year.