North Dakota's land-grant extension doesn't use a one-size-fits-all number — it uses a published method. Enter your soil-test values in the free calculator and Zone Forge returns tons of CaCO₃-equivalent per acre, ECCE-adjusted, with the citation.
~17% of ND has pH < 6.5, concentrated in SW ND (Dickinson REC region, Sandhills). NDSU 'What is Soil Acidity?' guidance: simple-rule 2 t/ac per 0.5 pH unit on loam+3%OM, with texture and OM modifiers. Replaces north_dakota_nebraska_proxy.
Published source: NDSU SF-882 — North Dakota Fertilizer Recommendation Tables and Equations + simple-rule lime
It depends on your soil's buffer/acidity reading and your target pH — North Dakota publishes a method, not a single number. Enter your values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
Source: NDSU SF-882 — North Dakota Fertilizer Recommendation Tables and Equations + simple-rule lime.
Zone Forge computes every North Dakota recommendation from that state's own published land-grant method — lime, soil-test fertilizer, and full variable-rate prescriptions. See the science →