Potassium
Wheat Production and Fertilization in Indiana
Recognizing Nutrient Deficiencies in Agronomic Crops, Turfgrasses, and other Plants
Soil Sampling for P, K, and Lime Recommendations
The Tri-State Fertilizer Recommendations for Corn, Soybeans, Wheat & Alfalfa (PDF)
Potassium Research and Education at Purdue University
