Massachusetts's land-grant extension publishes a method — not a one-size-fits-all rate. UMass SPNT Lab uses SMP / Sikora buffer for lime; Modified Morgan for nutrients. Live inputs: Mehlich buffer acidity and crop pH goal from Massachusetts's published method. Enter the required soil-test values in the free calculator for tons of CaCO₃-equivalent per acre, ECCE-adjusted, with the citation.
Published source: UMass Soil & Plant Nutrient Testing Lab — Modified Morgan + SMP/Sikora buffer
It depends on the Mehlich buffer acidity value on your lab report and your crop's published pH goal, exactly as Massachusetts publishes them. UMass SPNT Lab uses SMP / Sikora buffer for lime; Modified Morgan for nutrients. Enter those values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
Massachusetts sizes lime from Mehlich buffer / exchangeable acidity per its own published tables. UMass SPNT Lab uses SMP / Sikora buffer for lime; Modified Morgan for nutrients. Source: UMass Soil & Plant Nutrient Testing Lab — Modified Morgan + SMP/Sikora buffer.
Zone Forge computes Massachusetts lime from that state's published land-grant method (Mehlich buffer / exchangeable acidity as Massachusetts's published lime method reads it, with the crop's published pH goal) — lime calculator, soil-test fertilizer, and full variable-rate prescriptions. See the science →