Zone Forge reads your Tennessee soil test in Tennessee's own calibrated language — the critical levels and rate logic come straight from University of Tennessee — Nutrient Recommendations (M1 default + M3 dual calibration), not a national average.
Published source: University of Tennessee — Nutrient Recommendations (M1 default + M3 dual calibration)
University of Tennessee — Nutrient Recommendations (M1 default + M3 dual calibration). Zone Forge cites the publication on every recommendation.
Yes — the Tennessee 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 Tennessee soil test in its own state's language, then builds source-cited fertilizer and lime recommendations and full variable-rate prescriptions. See the science →