The Agricultural Zone (A1) is established to provide areas in which agricultural pursuits can be encouraged and supported within the municipality. The A1 zone is designed and intended to protect agricultural uses from encroachment of urban development until such time as residential, commercial, or industrial uses in such areas become necessary and desirable. Uses permitted in the A1 zone, in addition to agricultural uses, must be incidental thereto and should not change the basic agricultural character of the zone. Conversion of the agricultural zone to zones allowing urban uses should be accomplished in an orderly and progressive manner, with no “leap-frog” encroachments of such uses or developments into the agricultural area.