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. Lime has its own live calculator for Oregon with method-specific lab inputs.
Oregon — OSU Extension nutrient guides (W. Oregon EM-8963 + Eastern dryland FG-80/82/83/84 series) rates these crops in Oregon:
More crops via alternate guides selectable in Oregon: OSU Specialty Crop Nutrient Guides — Hops and Hazelnuts, PNW 615 — Nutrient Management for Field Corn Silage and Grain in the Inland Pacific Northwest, EM 9140 — Green Pea Nutrient Management for the Inland Northwest, East of the Cascades, EM 9224 — Nutrient Management for Pastures: Western Oregon and Western Washington.
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 and K; Oregon's live lime calculator is available separately with its own required lab inputs.
Yes — the free soil-test calculator covers source-cited P and K. Oregon also has a live lime calculator on Zone Forge that uses the state's published method. Open the Oregon lime guide or lime calculator for tons of CaCO3-equivalent per acre.
Zone Forge reads every Oregon soil test in its own state's language, then builds source-cited fertilizer and a live lime calculator and full variable-rate prescriptions. See the science →