Future of Tri-State Fertility Recommendations

The Tri-State Fertilizer Recommendations for Corn, Soybeans, Wheat and Alfalfa has served as a cornerstone for field crop soil fertility between Michigan, Ohio and Indiana. These recommendations were developed from decades of agronomic field trials across the three states. Although it was a collective scientific work, the extensive data that went into these recommendations were not systematically compiled and shared with the public. At Ohio State, Dr. Jay Johnson reported the results of his soil fertility field trials from each field season in an annual report (1976 - 1999). We went through these reports and pulled out every field trial that looked at P and K fertilization. This talk will show the results of these earlier field trials in Ohio and talk about current efforts that are underway to update and perhaps revise the Tri-State Recommendations.