Coverage · Source

University of Maine Soil Testing Handbook — Modified Morgan + Mehlich Buffer (3rd Revised Edition 2026)

v1.1 (2026-08-23) · Hoskins, B.R. (2026). 'Soil Testing Handbook for Professionals in Agriculture, Horticulture, Nutrient and Residuals Management' — Revised Third Edition. Maine Forestry & Agricultural Experiment Station, University of Maine Soil Testing Service / Analytical Lab, Orono ME 04469-5722. Lime equations: Hoskins (2001, unpublished MFAES lime incubation data). P interpretation: Cornell University (1994). Mid-season tests: Magdoff (1984) PSNT for corn; Porter (1991) petiole nitrate for potato.

State extension method Computes rates in-app Lime / pH
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Crops covered

AlfalfaAll vines (cucumber, gourd, melons, pumpkin, squash)Apples (new plantings only)Asparagus (established bed)Asparagus (new bed)BarleyBeetBrassica forageBroccoli (direct seeded and banded)Broccoli, cauliflower (transplants only)BuckwheatCabbageCanolaCarrotsCauliflower (direct seeded and banded)Chile peppersChristmas treesCloverCornCorn silageDry beansGeneral forestryGrass / forageGrass hayLettuceLupinMilletOatsOnionsPasturePeasPotatoesRadishRaspberry (established bed)Raspberry (new bed)Roadside stand mixRutabaga, turnipRyeSpinachStone FruitStrawberry (established bed)Strawberry (new bed)Sweet cornWheat

Nutrient source for

ME

Lime / pH source for

ME

Frequently asked

What method does University of Maine Soil Testing Handbook — Modified Morgan + Mehlich Buffer (3rd Revised Edition 2026) use?

State extension method. Zone Forge computes this source's supported nutrient rates in-app and cites the published method. Its published lime method is computed in-app too.

Is this free to use?

Yes — Zone Forge's calculators are free and need no signup. This page shows the states and crops University of Maine Soil Testing Handbook — Modified Morgan + Mehlich Buffer (3rd Revised Edition 2026) covers so you can verify the source behind your recommendation.

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