If its grass, I sprayed mine, then roughly dug it over to get rid of the couch grass etc, then rotivated it. Then on half dug in loads of manure and compost (The pumkins are very happy so far). On the other half I just piled the compost and manure on it and have had it covered with a tarpulin and left it as life has been very very busy this year and i am hoping the the worms will of done a good job. Shall stick more manure on it soon and leave over winter.
Happy digging 