Rhode Island's extension doesn't run its own soil-test calibration lab; it refers growers to neighboring-state methods. Zone Forge uses that published referral and discloses it in-app — no pretend precision. The University of Rhode Island runs only a pH and texture service and refers full nutrient testing to UConn and UMass, which both use the Modified Morgan method. Zone Forge follows that referral: Rhode Island recommendations use UMass's published Modified Morgan calibration, with the citation on every number. A separate live lime calculator is available for Rhode Island using its published method.
Rhode Island — URI Cooperative Extension referral pathway → UMass Soil & Plant Nutrient Testing Laboratory rates these crops in Rhode Island:
More crops via alternate guides selectable in Rhode Island: New England Vegetable Management Guide 2025-2026.
Published source: Rhode Island — URI Cooperative Extension referral pathway → UMass Soil & Plant Nutrient Testing Laboratory
Rhode Island refers growers to neighboring-state calibrations. The University of Rhode Island runs only a pH and texture service and refers full nutrient testing to UConn and UMass, which both use the Modified Morgan method. Zone Forge follows that referral: Rhode Island recommendations use UMass's published Modified Morgan calibration, with the citation on every number.
Yes — the Rhode Island soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P and K; Rhode Island's live lime calculator is available separately with its own required lab inputs.
Yes — the free soil-test calculator covers source-cited P and K. Rhode Island also has a live lime calculator on Zone Forge that uses the state's published method. Open the Rhode Island lime guide or lime calculator for tons of CaCO3-equivalent per acre.
Zone Forge reads every Rhode Island 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 →