Oregon's land-grant extension publishes a method — not a one-size-fits-all rate. Live calculator uses this state's published method and citation. Enter the required soil-test values in the free calculator for tons of CaCO₃-equivalent per acre, ECCE-adjusted, with the citation.
Western Oregon heavy lime country. Eastern Oregon variable; many soils neutral-to-alkaline. OSU EM-9585 (October 2025).
Published source: OSU Updated Lime Requirement Recommendations for Oregon (EM-9585, October 2025)
It depends on the inputs Oregon's land-grant method publishes — not a single national number. Enter your values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
Source: OSU Updated Lime Requirement Recommendations for Oregon (EM-9585, October 2025).
Zone Forge computes Oregon lime from that state's published land-grant method (the lab values required by this state's published method) — lime calculator, soil-test fertilizer, and full variable-rate prescriptions. See the science →