In such soils, consider using raised beds and bringing in good topsoil. Pelletized wettable sulfur is easier to apply than the dust. It should be thoroughly incorporated into the soil to a depth of 6 inches. The quantity of sulfur needed depends on initial pH and soil type. Foliar applications of chelated iron to the garden plants themselves can also be an option.
Plants absorb the iron through the leaves.
Growing Blueberries in Missouri, pg.