Soybean yields have increased substantially due to better management of improved varieties. One question is, “Are Clemson’s current potassium fertilizer recommendations good enough to sustain high soybean yields?” Previous research conducted in-depth work on evaluating K recommendations and plant analysis to optimize yield. This project expands that work to on-farm trials and verifies if results obtained at on-station trials are aligned with the results of on-farm trials. This helps create more robust datasets testing K fertility recommendations across production environments. The research will generate new information by evaluating the response of soybean yield across four application rates, determining K removal values for soybean and correlating the trifoliate leaf K concentration with soil test levels.