Zone Forge reads your North Carolina soil test in North Carolina's own calibrated language — the critical levels and rate logic come straight from NCDA&CS Agronomic Division — Mehlich-3 + Humic-Matter Lime + Orange Book Crop Fertilization, not a national average.
Per NCDA&CS Agronomic Division — Mehlich-3 + Humic-Matter Lime + Orange Book Crop Fertilization — below the critical level, a yield response to the added nutrient is expected.
Published source: NCDA&CS Agronomic Division — Mehlich-3 + Humic-Matter Lime + Orange Book Crop Fertilization
NCDA&CS Agronomic Division — Mehlich-3 + Humic-Matter Lime + Orange Book Crop Fertilization. Zone Forge cites the publication on every recommendation.
Yes — the North Carolina 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 North Carolina soil test in its own state's language, then builds source-cited fertilizer and lime recommendations and full variable-rate prescriptions. See the science →