Alabama's land-grant extension doesn't use a one-size-fits-all number — it uses a published method. Auburn AY-324B 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.
Auburn classifies AL soils into 4 groups by ECEC. Soil Groups 1-3 use Mehlich-1 extractant; Soil Group 4 (Black Belt clays) uses Mississippi/Lancaster extractant. Lime: Modified Adams-Evans (Huluka 2005) — 63% ECCC published basis.
Published source: Alabama — Auburn Nutrient Recommendations for Alabama Row Crops (May 2020)
It depends on your soil's buffer/acidity reading and your target pH — Alabama publishes a method, not a single number. Auburn AY-324B 2020. Enter your values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
Auburn AY-324B 2020. Source: Alabama — Auburn Nutrient Recommendations for Alabama Row Crops (May 2020).
Zone Forge computes every Alabama recommendation from that state's own published land-grant method — lime, soil-test fertilizer, and full variable-rate prescriptions. See the science →