Zone Forge reads your Oregon soil test in Oregon's own calibrated language — the critical levels and rate logic come straight from Oregon — OSU Extension nutrient guides (W. Oregon EM-8963 + Eastern dryland FG-80/82/83/84 series), not a national average.
Published source: Oregon — OSU Extension nutrient guides (W. Oregon EM-8963 + Eastern dryland FG-80/82/83/84 series)
Oregon — OSU Extension nutrient guides (W. Oregon EM-8963 + Eastern dryland FG-80/82/83/84 series). Zone Forge cites the publication on every recommendation.
Yes — the Oregon 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 Oregon soil test in its own state's language, then builds source-cited fertilizer and lime recommendations and full variable-rate prescriptions. See the science →