No one can predict the exact response of a single crop in a given year or at a specific location. Price relationships change, too. What should you do in a cropping sequence? Here are some clues from our long-term research.
Pesek, John; Shrader, W. D.; and Engelhorn, A. J.
"What Fertilizers for Crop Rotation?,"
Iowa Farm Science: Vol. 17
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol17/iss1/3