it all depends on where you are, i know in canada and the mid-west they shoot alot of ducks out of fields, but you also need to hunt the weather like you would over water. before a big winter storm is always a good time to try to bang some quackers in a field. and also the main factor to having ducks in your field is location and food quanity, if you have alot of waste corn laying in your field, the ducks will find it if they are there, but if they have food and water at the same time, why would they come to a field that could also be your problem, they are content just sitting on the water and dabbiling. but if it gets cold and the river or lake freezes, and you have a good field in a good location it could work. and try fullbody duck deeks like the GHGs or Hardcores, they make a world of differance to just taking the keels off your floaters and just sitting your floaters in the field (which will work in the morning or dusk.

good luck