Leaving some food source may or may not help. It all depends on how much other food source is available in the area. If it is corn, it seems to work best if it is square in shape of at least two or three acres. If you have a couple acres of standing corn near a water source, the deer may still hang around in the standing corn. The value of the corn in those two or three acres can be a good sum of money.
If there is a soybean field that has just been harvested, you may want to go to that area. Deer seem to like feeding in a soybean field that has just been combined. One thing deer do not like is crossing a field that has been plowed.