Buffering of agricultural uses. For all new proposed developments, including subdivision, site plan, variances and special use permit requirements, buffer zones at least 75 feet in width may be required between residential and agricultural uses in the AO District, containing either thickly planted fast-growing native shrubs and trees, or naturally existing vegetation, in order to create an effective barrier separating residential yards from fields and pastures. These buffer requirements are in addition to the setbacks required under this chapter and may be modified by the reviewing board, if appropriate, in order to create or maintain scenic views.