Zone Forge reads your North Dakota soil test in North Dakota's own calibrated language — the critical levels and rate logic come straight from NDSU SF-882 — North Dakota Fertilizer Recommendation Tables and Equations + simple-rule lime, not a national average.
Per NDSU SF-882 — North Dakota Fertilizer Recommendation Tables and Equations + simple-rule lime — below the critical level, a yield response to the added nutrient is expected.
Published source: NDSU SF-882 — North Dakota Fertilizer Recommendation Tables and Equations + simple-rule lime
NDSU SF-882 — North Dakota Fertilizer Recommendation Tables and Equations + simple-rule lime. Zone Forge cites the publication on every recommendation.
Yes — the North Dakota soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P, K and lime guidance.
Zone Forge reads every North Dakota soil test in its own state's language, then builds source-cited fertilizer and lime recommendations and full variable-rate prescriptions. See the science →