Zone Forge reads your Idaho soil test against Idaho's own publication — the critical levels and rate logic come straight from University of Idaho — Northern ID (dryland Palouse) + Southern ID (irrigated Snake River Plain) Fertilizer Guides, not a national average. Lime calculation is coming soon for Idaho; fertilizer guidance below does not imply a live lime rate.
University of Idaho — Northern ID (dryland Palouse) + Southern ID (irrigated Snake River Plain) Fertilizer Guides rates these crops in Idaho:
More crops via alternate guides selectable in Idaho: PNW 615 — Nutrient Management for Field Corn Silage and Grain in the Inland Pacific Northwest.
Published source: University of Idaho — Northern ID (dryland Palouse) + Southern ID (irrigated Snake River Plain) Fertilizer Guides
University of Idaho — Northern ID (dryland Palouse) + Southern ID (irrigated Snake River Plain) Fertilizer Guides. Zone Forge cites the publication on every recommendation.
Yes — the Idaho soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P and K. Lime calculation for Idaho is labeled coming soon — use your lab report or Extension for a lime rate today.
Not yet as a live Zone Forge calculator. Idaho's lime source is mapped and cited, but the exact calculation is still staged. Use the lime recommendation on your current soil-lab report or contact local Extension for a rate today; the Idaho lime guide links the published source.
Zone Forge reads every Idaho soil test in its own state's language, then builds source-cited fertilizer and a mapped lime source (calculation coming soon) and full variable-rate prescriptions. See the science →