Northern Research and Demonstration Farm
The study was established in 1963 to determine (1) if acidification of soil from nitrogen (N) fertilization could be controlled in continuous corn with annual lime applications, (2) the amounts of phosphorus (P) and potassium (K) fertilizer and lime needed to maintain fertility, and (3) the nutrient balances that would develop and their effects on corn production.
Iowa State University
Henning, Stanley, "Corn and Soil Responses to N, P, K, and Lime" (2005). Iowa State Research Farm Progress Reports. 1259.