Cardeer; you may be best to spray the field down with Roundup to kill off the present vegetation. Otherwise plow it and disc a few times as the weed seeds germinate. I think you're talking about Teasels as your main weed and they're loaded with seeds for next year. As for a good all around feed, clover (red or ladino) is the way to go. The red is only good for 2-3 years but the ladino will last at least double that. You will have to mow it a couple of times each year to keep the weeds down.

Dan O.