just to help clarify the above, the laws for food plots are different for ducks and doves, most dove fields are illegal for duck hunting, on a duck hunting spot the grains must be harvested and removed from site or you can leave the grains standing being careful to not physically knock them down
on dove fields you can bushog the grain and leave it in location, the key factor is not to bring back any grains or add any other foods for bait
scn can go into deeper detail if necessary or correct me
I tried a acre or so spot of sunflowers a few years ago... total waste of time.. I think I had one that made it.. the deer wiped them out and they never got knee high..