The Agricultural Zone (in this title referred to as A zone) is intended as a district for general agricultural purposes, with appropriate single-family residences and customary accessory buildings. Except as specifically provided elsewhere in this chapter, any and all buildings and premises, or land, in the A zone shall be used for, or occupied, and every building shall be erected, constructed, established, altered, enlarged, maintained, moved into or within the A zone exclusively and only in accordance with the regulations set forth in this chapter.
(`78 Code, § 17.06.010.)