By Lily Calderwood, Ph.D., wild blueberry specialist and associate professor of horticulture, University of Maine Cooperative Extension; Leala Machesney, wild blueberry research and Extension professional, University of Maine Cooperative Extension For information about UMaine Extension programs and resources, visit extension.umaine.edu.Find more of our publications and books at extension.umaine.edu/publications/. Introduction Soil and leaf testing are essential