field hunting is such a pain in my opinion. i hardly scout for them anymore. unless it's a field that you can hunt literally whenever you want, it's almost hopeless in my opinion. i won't even hunt a field unless there is birds in it the night before or if it's a loafing field for geese. we've had good luck there. i think that convincing ducks especially, to come in is extremely difficult if they aren't already working that field the few days before. throw in the access problem and timing, and good luck. it could just be me tho, never know. i've got access to a couple wheat, alfalfa and corn fields and only one of them ever produces. plus if it's not crappy weather good luck in a field. last season was extremely mild so that made it even tougher. the alfalfa field usually has geese all over it almost everyday in dec/jan. last season, they didn't frequent the field until 2 weeks after the season. 200 of them. the field was black, boy was i pissed. so now throw in flight path concerns, location, timing, weather, access and good luck... it's not like how everyone thinks it is on tv. those guys like the fowl life crew get a call when there is 200 birds in the field the night before then they come out in the morning and setup. you could kill limits doing that without decoys or a call.
sorry to rant, don't let me discourage you. not saying you can't get lucky and find a nice landowner in a good spot. just work hard, bring your binos, ask for permission in the summer for fields you know hold birds sometime during the season. then during the season, scout for fields holding birds already then knock doors and grind it. you'll find something! but all i'm saying is that of the 100 birds i killed last year, i killed maybe 15 of them, ducks/geese included, on private fields