Blueberries require soil with a pH of 4.5 to 5.5. For soils that typically have a low organic matter content, incorporating peat moss or well-decayed pine sawdust or bark will improve plant survival and growth. Apply 3 inches to 4 inches of the organic material over the row in a band 18 inches to 24 inches wide and incorporate thoroughly using a rototiller or spade to a depth of 6 inches to 8 inches. For small plantings, the soil structure may be improved by the incorporation of organic materials such as peat, pine bark or leaf mold into the soil. Heavy soils require larger quantities than do lighter soils and are more difficult to maintain. Mix 2 to 5 gallons of wet peat moss or milled pine bark with the soil in each planting hole. Do not use any agriculture lime.