RE: food plot keep deer out?
I tried PlotSaver and didn't have any success with it.
The best remedy is to plant enough that they can't eat it down to the ground while it's trying to get established. How much is enough is the tough question.
I've also read of some who actually put up a fence but that could get a little expensive.
I know I haven't been much help here but it depends a lot on your plot size.