R.I. Gen. Laws § 4-24-7: Farmland exemption.

Farmland defined as any tract or tracts of land, including woodland and wasteland constituting a farm unit which is actively devoted to agricultural or horticultural use including, but not limited to: forages and sod crops; grains and feed crops; fruits and vegetables; poultry, dairy, and other livestock and their products; nursery, floral and greenhouse products; and any other food or fiber products useful to people; shall be exempt from the provisions of this chapter.