Tilling is good if you want to get rid of your soil structure, limit water infiltration and encourage weeds in an old food plot. Every time you till the soil you stir up the seed bank and encourage more stuff to germinate. It also breaks your soil structure, causing those smaller particles to pack tighter and decrease waster permeability. Spray it, mow it and notill into it is what I would do, and did for a living for a good while along with habitat restoration. I used to agree with the tillage crowd until I saw the light.
