I believe here lies the problem. You used to be able to hunt the clean & green or drive the deer.
Until the 2001 regulations changed. From Pennstate link.
https://pennstatelaw.psu.edu/_file/aglaw/Pennsylvania_Clean_and_Green.pdf
The regulation at 7 Pa. Code § 137b.64 now allows land owners to place reasonable restrictions on the public's access to a tract of land that is enrolled in Clean and Green as Agricultural Reserve land. These restrictions might include limiting access to the land to pedestrians only, prohibiting hunting or the carrying or discharging of firearms on the land, prohibiting entry where damage to the land might result or where hazardous conditions exist, or other reasonable restrictions.
Clean and Green Act do not dramatically alter the old regulations but do provide a few important new changes.Again, these include:
1. The Pennsylvania Department of Agriculture now sets the maximum use values for the counties.
2. Farmstead land now qualifies for a preferential assessment (lower use values)and;
3. "Reasonable restrictions" may now be placed on the publics' access to Ag Reserve land by enrolled landowners.