v1.0 (2026-05-23) · Arizona soils are predominantly alkaline (pH 7.5-8.5+). UA Cooperative Extension does not run a producer-facing soil testing lab; az1111 directs farmers to commercial labs. Liming is essentially never indicated on irrigated AZ cropland. Northern AZ (Mogollon Rim / White Mountains forested elevations) may have isolated acidic pockets, but those aren't where row-crop or commercial agriculture happens. The agronomic problem in AZ is the opposite — managing alkalinity, sodicity, and salinity.
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 Arizona — alkaline-soil region (lime rarely needed) covers so you can verify the source behind your recommendation.
Browse the full Coverage Explorer — every state, crop and source — or see the science →