Bulletin #2279, Using Wood Ash on Your Farm (PDF) Developed by Timothy S. Griffin, Sustainable Agriculture Specialist. For information about UMaine Extension programs and resources, visit extension.umaine.edu. Find more of our publications and books at extension.umaine.edu/publications/. Table of Contents: Nutrients in Wood Ash Wood Ash as a Liming Agent Table 1. Calcium carbonate equivalents (CCEs)