Plate 21



   Cultivation can either destroy or enhance and tremendously improve the fertility of any soil. Upper left: Nearly three years of Keyline, which, by cultivation techniques and other means, greatly improved the soil climate and produced rapidly deepening soil and high quality pasture. This picture shows non-irrigated rain-only pasture. Upper right: A popular-sized Graham plow of a type used on our own properties.

   Lower: A 69-foot Graham plow specially produced for a Queensland farmer, believed to be the largest plow in the world (1955). The Graham plow is a useful implement for cultivating the top of the wall of farm dams, and all other areas of exposed earth. (See also Plates 24, 25, 26, 27 and 29 lower.) (Professional photograph )