Washington'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.
Eastern WA Palouse and Western WA need lime. Central WA Columbia Basin irrigated rarely does. WSU FS398E (June 2025).
Published source: WSU Extension — East/West Cascade nutrient + Inland NW lime (combined source)
It depends on the inputs Washington'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: WSU Extension — East/West Cascade nutrient + Inland NW lime (combined source).
Zone Forge computes Washington 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 →