I have done alot of my hunting over the years on farmland... and the one thing I have to say is I perfer to hunt after a cornfield or a bean field has been picked... it seems that the number of animals comeing into the field is more and is more frequent..now you might not see a monster in the field everyday but is not uncommon to see average to decent sized (shooters) bucks in the field anytime of the day if it is a place that is not recieved much pressure... if it recieves pressure then early morning and late evening will be the best times... like c903 said find the trails leading to and from the field and try to set up to cover the most trails possible and be patient I have hunted fields and seen 20 deer in them one day and none the next!!!