bigbucks98, this is where those trail cameras are great in monitoring food plots.
I just got one and it is so far the best investment I have aside from scouting or hunting an area myself.One thing you can do is if you are driving around and see deer feeding take a note of what they are feeding on. I don't know why but for some reason if deer are feeding on corn in one field, 3 fields away the same is happening on another field.They must know what is good during certain times.