Zone Forge reads your Hawaii soil test in Hawaii's own calibrated language — the critical levels and rate logic come straight from Hawaii — UH-Manoa CTAHR Agricultural Diagnostic Service Center, not a national average. Lime has its own live calculator for Hawaii with method-specific lab inputs.
Hawaii — UH-Manoa CTAHR Agricultural Diagnostic Service Center rates these crops in Hawaii:
Published source: Hawaii — UH-Manoa CTAHR Agricultural Diagnostic Service Center
Hawaii — UH-Manoa CTAHR Agricultural Diagnostic Service Center. Zone Forge cites the publication on every recommendation.
Yes — the Hawaii soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P; Hawaii's live lime calculator is available separately with its own required lab inputs.
Yes — the free soil-test calculator covers source-cited P. Hawaii also has a live lime calculator on Zone Forge that uses the state's published method. Open the Hawaii lime guide or lime calculator for tons of CaCO3-equivalent per acre.
Zone Forge reads every Hawaii soil test in its own state's language, then builds source-cited fertilizer and a live lime calculator and full variable-rate prescriptions. See the science →