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Abstract Soil testing is an important practice for nutrient management in agricultural production systems. In the United States, soil‐test methods and interpretations vary across state lines, making institutional collaborations challenging and crop fertilization guidelines inconsistent. Uniformity and transparency in P and K soil fertility testing and fertilizer recommendations are needed to enhance end‐user adoption. The Fertilizer Recommendation Support Tool (FRST) project is developing a comprehensive database of P and K correlation–calibration results that can be accessed through an online tool for use in research and fertilizer recommendation development. This collaborative project, which includes over 30 land‐grant universities, the USDA‐ARS, the USDA‐NRCS, and several not‐for‐profit organizations, contains a national survey describing the current status of soil testing, minimum requirements for correlation–calibration data inclusion, and database population and creating FRST as a user‐friendly online decision support tool. The FRST project will provide more consistent, transparent, and science‐based information for crop nutrient recommendations across the United States.