Indiana's land-grant extension doesn't use a one-size-fits-all number — it uses a published method. Tri-State Fertilizer Recommendations (Ohio State + Purdue + Michigan State, 2020). Enter your soil-test values in the free calculator and Zone Forge returns tons of CaCO₃-equivalent per acre, ECCE-adjusted, with the citation.
Published source: Tri-State Fertilizer Recommendations (2020)
It depends on your soil's buffer/acidity reading and your target pH — Indiana publishes a method, not a single number. Tri-State Fertilizer Recommendations (Ohio State + Purdue + Michigan State, 2020). Enter your values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
Tri-State Fertilizer Recommendations (Ohio State + Purdue + Michigan State, 2020). Source: Tri-State Fertilizer Recommendations (2020).
Zone Forge computes every Indiana recommendation from that state's own published land-grant method — lime, soil-test fertilizer, and full variable-rate prescriptions. See the science →