Remy and McFarmer make good points. For example, two years ago I had been granted verbal rights--by the tenant, whom I thought I knew and trusted, to hunt a poorly drained farm that held both mallards and roosters. So, two days before Thanksgiving my son and I set out to jump some ducks on the ditches that cut through the farm, north and south. We had just left the truck when who should show up but the owner and his young son, who wanted to trap the ditches for "rats" (muskrats). Of course this was perfectly justifiable as he owns the property, but lives in a small town 30 miles away. You probably can guess what happens next. He unceremoniously kicks us off, even after I explained that we had taken the time to request, and receive verbal permission from the tenant who assured us we'd be fine. I was told that the tenant had no authority to grant such permission, and that he (the owner) planned to "set the tenant straight" on this subject.
Imagine my chagrin when the tenant, upon being accosted by the owner, denied giving me permission---then the tenant called to chastise me for hunting where he had given me permission. He was in a sweat; he didn't want to lose this rented ground....Lesson learned--if I am not intimately acquainted with all parties involved, I get it in writing now.
Some other considerations on this subject: In owning farm real estate, the owner is conferred with what, in farm appraisal doctrine, is called a "bundle of rights": The right to farm the land, the right of ingress and egress, the right to build or improve it, the right to grant access to others, to lease it, or the right to do NONE of those things. As the encroaching hunter, any access granted you is a privilege, NOT a right --on PRIVATE land.
Further compounding the hunters' dilemma is the fact that, unlike decades ago, much of the most intensively farmed land is owned by absentee parties, and possibly even managed by a third party (Trust Department of a bank, professional farm managers, etc.). For example, a 160 acre tract may be owned by a farm widow in a nursing home miles (or maybe states) away. Her grown children might consist of a daughter who is a doctor, a son who drives a propane truck for the local FS Co-op, etc. Finding the individual(s) with the actual AUTHORITY to grant you permission to hunt can sometimes feel like kicking at a wall of blubber!! Furthermore, the heirs may not all agree on whether the land should be hunted.
A suggestion: If you want to build solid landowner relations, treat the seeking of permission seriously, and respect the land and the hard, SACRED work of the farm and ranch owners who allow food production to take place. Two sayings that pertain here:
1.) "One "AW SHIT!" wipes out "1,000 ATTABOYS!" and #2.) Never be a son of a bitch on someone else's land...there's bars in town for that.......