v1.0 (2026-05-27) · URI Cooperative Extension Gardening Information and Soil Testing (GIST) service page (2026). Explicit official statement: 'Need to dig deeper? Full nutrient analysis options: The University of Connecticut Soil Nutrient Analysis Laboratory and the University of Massachusetts Soil & Plant Nutrient Testing Laboratory offer in-depth soil analysis for a nominal fee. These tests determine a) Nutrient levels and fertilizer recommendations; b) Elevated lead levels or other toxic heavy metals; and c) Proper soil amendments...' URI's own service is pH-only (free, March–October, statewide via GIST community-event booths or Kingston campus walk-in/mail). RI has no land-grant-operated commercial agronomic soil-test lab.
State extension method. Zone Forge computes this source's supported nutrient rates in-app and cites the published method.
Yes — Zone Forge's calculators are free and need no signup. This page shows the states and crops Rhode Island — URI Cooperative Extension referral pathway → UMass Soil & Plant Nutrient Testing Laboratory covers so you can verify the source behind your recommendation.
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