a couple hundred pounds on a 50x50 plot would be major overkill and do more damage than good. Read the label on your fertilizer package to get amounts needed. A triple 19 would be a good ratio to use. If your real sandy, moisture retention will be a major factor in getting roots established. If you have access to some manure, spread some out in the area to help hold moisture. Any lime added will RAISE your soil ph. It takes months though for lime to react with soil in a raising/lowering ph situation.Taz