Zone Forge reads your Maine soil test in Maine's own calibrated language — the critical levels and rate logic come straight from University of Maine Soil Testing Handbook — Modified Morgan + Mehlich Buffer (3rd Revised Edition 2026), not a national average.
Published source: University of Maine Soil Testing Handbook — Modified Morgan + Mehlich Buffer (3rd Revised Edition 2026)
University of Maine Soil Testing Handbook — Modified Morgan + Mehlich Buffer (3rd Revised Edition 2026). Zone Forge cites the publication on every recommendation.
Yes — the Maine soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P, K and lime guidance.
Zone Forge reads every Maine soil test in its own state's language, then builds source-cited fertilizer and lime recommendations and full variable-rate prescriptions. See the science →