Hawaii's land-grant extension doesn't use a one-size-fits-all number — it uses a published method. UH-Manoa CTAHR derived from target pH × current pH × soil bulk-density class. Enter your soil-test values in the free calculator and Zone Forge returns tons of CaCO₃-equivalent per acre, ECCE-adjusted, with the citation.
Hawaii lime is fundamentally bulk-density-dependent. High-rainfall windward sides leach lime faster. Leeward calcareous soils are alkaline — lime NOT needed. Pineapple fields: do NOT lime except on extreme acid Andisols.
Published source: Hawaii — UH-Manoa CTAHR Agricultural Diagnostic Service Center
It depends on your soil's buffer/acidity reading and your target pH — Hawaii publishes a method, not a single number. UH-Manoa CTAHR derived from target pH × current pH × soil bulk-density class. Enter your values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
UH-Manoa CTAHR derived from target pH × current pH × soil bulk-density class. Source: Hawaii — UH-Manoa CTAHR Agricultural Diagnostic Service Center.
Zone Forge computes every Hawaii recommendation from that state's own published land-grant method — lime, soil-test fertilizer, and full variable-rate prescriptions. See the science →