All state lands hereafter leased for grazing or agricultural purposes shall be open and available to the public for purposes of hunting and fishing, and for nonconsumptive wildlife activities, as defined by the board of natural resources, unless closed to public entry because of fire hazard or unless the department gives prior written approval and the area is lawfully posted by lessee to prohibit hunting and fishing, and nonconsumptive wildlife activities, thereon in order to prevent damage to crops or other land cover, to improvements on the land, to livestock, to the lessee, or to the general public, or closure is necessary to avoid undue interference with carrying forward a departmental or agency program. In the event any such lands are so posted it shall be unlawful for any person to hunt or fish, or pursue nonconsumptive wildlife activities, on any such posted lands. Such lands shall not be open and available for wildlife activities when access could endanger crops on the land or when access could endanger the person accessing the land.
The department shall insert the provisions of this section in all new grazing and agricultural leases.