1. Phosphorus and Potassium Impacts on Field Crop Production in the Intermountain West

Macronutrients such as phosphorus (P), potassium (K), and sulfur (S) are essential nutrients often required in large quantities for optimal plant growth, with fertilizers typically supplementing soil nutrients. Fertilizer recommendations can vary significantly depending on the source and greatly affect crop profitability. Guidelines in Utah and many other states in the region were developed decades ago and need to be reassessed. Current Utah State University (USU) Guidelines identify 15 mg kg-1,... M. Baker, M.A. Yost