The owner or adjoining owners of any platted or unplatted tract or tracts of land containing not less than five (5) acres, included within the corporate limits of any city in this state and used exclusively for agricultural purposes, provided, however, if there is upon or over such tract or tracts of land a railroad or canal right of way, such tract or tracts shall, if no other reason exists, be deemed to be used exclusively for agricultural purposes, within the meaning of this section, may petition the district court of the county in which such tract or tracts of land are situated for a judgment and decree of the court detaching such tract or tracts of land from such city.