v1.0 (2026-05-23) · New Mexico soils are predominantly alkaline. NMSU's Soil, Water, and Agricultural Testing (SWAT) Laboratory CLOSED in June 2012; Guide A-146 now refers farmers to outside labs. Free-lime content is treated as a CONSTRAINT (not as a buffer signal): soils with >3% CaCO3 will have pH ≥ 7.5 and high buffering against pH change. Rare exception: high-elevation mountain valleys (Sangre de Cristos, Mogollon Rim foothills) can have mildly acidic soils.
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.
Alkaline-region advisory. Zone Forge follows the state's extension guidance that lime is rarely needed on these alkaline soils.
Yes — Zone Forge's calculators are free and need no signup. This page shows the states and crops New Mexico — alkaline-soil region (lime rarely needed) covers so you can verify the source behind your recommendation.
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