v1.5 (2026-08-23) · University of Alaska Fairbanks (UAF) Cooperative Extension Service is the authoritative agronomic source for Alaska. UAF does not publish UDel-style yield × FIV lookup tables; instead it publishes crop-specific N rate ranges, P-availability guidance noting cold-soil constraints, and pH/lime recommendations geared to the two main commercial-ag valleys (Matanuska-Susitna and Tanana). Mehlich-3 is the recommended P extractant per UAF Soils program. Commercial agricultural footprint in Alaska is small (~30,000 cropland acres statewide vs. millions in Lower 48 states); this source ships UAF anchors and is flagged 'calibrated' because it represents the actual land-grant published guidance for AK — not because it has the table-density of a Lower-48 publication. Boron and other micronutrients may be required for brassicas and root crops in interior Alaska soils.
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.
Yes — Zone Forge's calculators are free and need no signup. This page shows the states and crops Alaska — UAF Cooperative Extension Service covers so you can verify the source behind your recommendation.
Browse the full Coverage Explorer — every state, crop and source — or see the science →