(2) In the absence of voluntary integration, the governing board of the State Department of Geology and Mineral Industries, upon the application of any interested person, shall make an order integrating all tracts or interests in the spacing unit for the development and operation thereof and for the sharing of production therefrom. The board, as a part of the order establishing one or more spacing units, may prescribe the terms and conditions upon which the royalty interests in the units shall, in the absence of voluntary agreement, be deemed to be integrated without the necessity of a subsequent order integrating royalty interests. Each such integration order shall be upon terms and conditions that are just and reasonable. [Formerly 520.075]