We've started field hunting geese and ducks more in recent years. We mainly look for the geese late afternoon that are working combined wheat, corn, beans or other fields they're attracted to. We may or may not even see ducks working the same field that time of the day. Although, later season when it's colder both geese and ducks will field feed more frequently up at this latitude.
We set up in the early mornings in the same fields (after getting permission of course the evening before.) Most goose decoys, with a few duck shells or full bodies off to one side. I'm told that geese don't like to fly directly over ducks on the ground, so we set up taking that and the wind to our back.
We usually get any numbers of ducks in over the decoys very early. Sometimes just before light we've had flocks hovering over a spinning wings decoy for 30 seconds or more. Gotta wait patiently. Unless there is ground fog the ducks usually stop coming in very close for us after the virst 1 to 1.5 hours. Then we concentrate on the geese. Last year was an amazing year for Canada and Snow/Blue geese for us. Hope to have many more opportunities to come.