Zone Forge reads your Arizona soil test in Arizona's own calibrated language — the critical levels and rate logic come straight from Arizona — University of Arizona Cooperative Extension (Olsen-P calibration), not a national average. Lime is rarely needed per Arizona's alkaline-soil guidance — no automatic rate is invented.
Per Arizona — University of Arizona Cooperative Extension (Olsen-P calibration) — below the critical level, a yield response to the added nutrient is expected.
Arizona — University of Arizona Cooperative Extension (Olsen-P calibration) rates these crops in Arizona:
Published source: Arizona — University of Arizona Cooperative Extension (Olsen-P calibration)
Arizona — University of Arizona Cooperative Extension (Olsen-P calibration). Zone Forge cites the publication on every recommendation.
Yes — the Arizona soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P and K. Lime is advisory only here — see the Arizona lime guide rather than expecting a numeric calculator rate.
Usually not. Arizona is an alkaline-soil region — Zone Forge does not invent an automatic lime rate. Review the cited guidance on the Arizona lime guide; if a lab report shows unusually acid soil, confirm with the lab or local Extension before liming.
Zone Forge reads every Arizona soil test in its own state's language, then builds source-cited fertilizer and alkaline-soil lime guidance (no automatic rate) and full variable-rate prescriptions. See the science →