There are a few things to consider here. The weather. If it is warm the deer tend to bed down all day and come out at night. If it is windy they don't like it because they can't tell where the smells are coming from so they stay bedded.
With people hunting nearby, that will spook them and their habits will change. You should never hunt the same stand twice (after harvesting a deer), unless you wait a few weeks between. Deer will get used to anything if given time, so if they are spooked off this field now, they may return in the near future. The best thing you can do is keep going.
If they are spooked off this field, all the food in the world will not attract them. You can try getting corn or protein pellets (or whole oats like they feed to horses, which the bucks here seem to like a lot), but if they are spooked it will not do any good.
Time of day is a consideration too. Deer move approximately every four hours, so you should be there before the sun comes up and stay until 10am if possible. You might come back by at noon and again at 4pm and then stay until the sun goes down. You also might change positions on the edge of the field. Make sure the trails are in front of you and not behind you. Perhaps the deer are coming up from behind you, smelling you and then going around or the other way.
I don't know how many hours I've sat out there and seen nothing, but eventually you'll see one and it will have been worth it :)