Soybean yields have increased substantially in recent decades due to better management of improved varieties. The question being asked is, “Are Clemson’s current potassium (K) fertilizer recommendations good enough to sustain high soybean yields?” In phase one, we have conducted in-depth work at Edisto REC on evaluating K recommendations and plant analysis to optimize yield. In the second phase, we want to expand this work to on-farm trials and verify if results obtained at on-station trials are aligned with the results of on-farm trials. This will help us to create more robust datasets testing K fertility recommendations across production environments. The proposed research will generate new information that will make Soybean production in South Carolina more productive and profitable.