v1.0 (2026-05-23) · University of Connecticut Soil Nutrient Analysis Laboratory (SNAL). Uses SMP / Sikora buffer; Modified Morgan extraction for nutrients. Per NE Regional Bulletin 493 Ch. 3 (CT and MA are SMP / Sikora users). UConn also serves Rhode Island farmer samples since URI doesn't run a full agronomic lab.
This source publishes a state method — its crop-specific rate tables are maintained in the extension bulletin rather than a fixed crop list, so Zone Forge doesn't claim a crop set here.
Lime calculator. Zone Forge computes this source's published lime rates in-app and cites the method.
Yes — Zone Forge's calculators are free and need no signup. This page shows the states and crops UConn Soil Nutrient Analysis Laboratory — SMP / Sikora buffer covers so you can verify the source behind your recommendation.
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