Zone Forge reads your Colorado soil test in Colorado's own calibrated language — the critical levels and rate logic come straight from Colorado — CSU Extension Crop Series Soil fact sheets (Olsen-P + Mehlich-3 dual calibration), not a national average. Lime is rarely needed per Colorado's alkaline-soil guidance — no automatic rate is invented.
Colorado — CSU Extension Crop Series Soil fact sheets (Olsen-P + Mehlich-3 dual calibration) rates these crops in Colorado:
Published source: Colorado — CSU Extension Crop Series Soil fact sheets (Olsen-P + Mehlich-3 dual calibration)
Colorado — CSU Extension Crop Series Soil fact sheets (Olsen-P + Mehlich-3 dual calibration). Zone Forge cites the publication on every recommendation.
Yes — the Colorado 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 Colorado lime guide rather than expecting a numeric calculator rate.
Usually not. Colorado is an alkaline-soil region — Zone Forge does not invent an automatic lime rate. Review the cited guidance on the Colorado lime guide; if a lab report shows unusually acid soil, confirm with the lab or local Extension before liming.
Zone Forge reads every Colorado 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 →