Zone Forge reads your South Dakota soil test in South Dakota's own calibrated language — the critical levels and rate logic come straight from South Dakota - SDSU Extension Fertilizer Recommendations (EC750 lineage + S-0003-23 Corn / S-0004-22 Soybean / S-0005-11 Wheat), not a national average. Lime has its own live calculator for South Dakota with method-specific lab inputs.
South Dakota - SDSU Extension Fertilizer Recommendations (EC750 lineage + S-0003-23 Corn / S-0004-22 Soybean / S-0005-11 Wheat) rates these crops in South Dakota:
Published source: South Dakota - SDSU Extension Fertilizer Recommendations (EC750 lineage + S-0003-23 Corn / S-0004-22 Soybean / S-0005-11 Wheat)
South Dakota - SDSU Extension Fertilizer Recommendations (EC750 lineage + S-0003-23 Corn / S-0004-22 Soybean / S-0005-11 Wheat). Zone Forge cites the publication on every recommendation.
Yes — the South Dakota soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P and K; South Dakota'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. South Dakota also has a live lime calculator on Zone Forge that uses the state's published method. Open the South Dakota lime guide or lime calculator for tons of CaCO3-equivalent per acre.
Zone Forge reads every South Dakota 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 →