Zone Forge reads your New Hampshire soil test in New Hampshire's own calibrated language — the critical levels and rate logic come straight from New Hampshire — UNH Cooperative Extension Soil Testing Service, not a national average.
Per New Hampshire — UNH Cooperative Extension Soil Testing Service — below the critical level, a yield response to the added nutrient is expected.
Published source: New Hampshire — UNH Cooperative Extension Soil Testing Service
New Hampshire — UNH Cooperative Extension Soil Testing Service. Zone Forge cites the publication on every recommendation.
Yes — the New Hampshire 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 New Hampshire soil test in its own state's language, then builds source-cited fertilizer and lime recommendations and full variable-rate prescriptions. See the science →