Alabama's land-grant extension publishes a method — not a one-size-fits-all rate. Auburn AY-324B 2020. All four Appendix A targets (5.5/6.0/6.5/7.0) staged verbatim; default target pH 6.5 (Auburn row-crop default). 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.
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% ECCE published basis.
Published source: Alabama — Auburn Nutrient Recommendations for Alabama Row Crops (May 2020)
It depends on the inputs Alabama's land-grant method publishes — not a single national number. Auburn AY-324B 2020. All four Appendix A targets (5.5/6.0/6.5/7.0) staged verbatim; default target pH 6.5 (Auburn row-crop default). Enter your values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
Auburn AY-324B 2020. All four Appendix A targets (5.5/6.0/6.5/7.0) staged verbatim; default target pH 6.5 (Auburn row-crop default). Source: see the calculator citation. Source: Alabama — Auburn Nutrient Recommendations for Alabama Row Crops (May 2020).
Zone Forge computes Alabama 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 →