Zone Forge reads your Illinois soil test in Illinois's own calibrated language — the critical levels and rate logic come straight from Illinois Agronomy Handbook — Chapter 8 (Managing Soil pH and Crop Nutrients), not a national average. Lime has its own live calculator for Illinois with method-specific lab inputs.
Illinois Agronomy Handbook — Chapter 8 (Managing Soil pH and Crop Nutrients) rates these crops in Illinois:
Published source: Illinois Agronomy Handbook — Chapter 8 (Managing Soil pH and Crop Nutrients)
Illinois Agronomy Handbook — Chapter 8 (Managing Soil pH and Crop Nutrients). Zone Forge cites the publication on every recommendation.
Yes — the Illinois soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P and K; Illinois's live lime calculator is available separately with its own required lab inputs.
Yes — the free soil-test calculator covers source-cited P and K. Illinois also has a live lime calculator on Zone Forge that uses the state's published method. Open the Illinois lime guide or lime calculator for tons of CaCO3-equivalent per acre.
Zone Forge reads every Illinois soil test in its own state's language, then builds source-cited fertilizer and a live lime calculator and full variable-rate prescriptions. See the science →