As others have said,and I agree, every time you stir the soil ,you will bring up weed seed. I beat this drum a lot, but 2-4,D does a pretty good job and has enough residual effect to be a go to for me on problem areas. I agree with cultivate /wait /spray again method. If you plant something aggressive, like cow peas , it can out compete about any weeds. Easy .Cheap. Getting ahead of established weed population can take years .It's probably better to learn how to work with mother nature. Pushing a car down hill is a lot easier than up hill.Chemicals only get you a head start on weeds. Plant corn and use 2-4,D post emergent.You want your weeds to emerge in the corn so you can kill them and feed the deer at the same time.And the bigger problems tend to be broad leaf.. Gly is good, but it's starting to loose some effectiveness..If you plant clover, it will fade into dormancy in the heat of summer and you can spray about anything you like to kill the broad leaves and the clover will come back clean in the fall. Just some thing to think about