For purposes of this act, the term “agricultural land” means land capable of use in the production of agricultural crops, timber, livestock or livestock products, poultry or poultry products, milk or dairy products, or fruit and other horticultural products but does not include any royalty interest, any oil, gas or other mineral interest, or any lease, right-of-way, option or easement relating thereto, or any land zoned by a local governmental unit for a use other than and nonconforming with agricultural use.