Challenges of Predicting Year Variation in Corn Nitrogen Fertilizer Requirement.
Bill Deen, Plant Agriculture, University of Guelph, Guelph, ON, Canada, Ken Janovicek, Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada, John Lauzon, School of Environmental Science, University of Guelph, Guelph, ON, Canada, Greg Stewart, Ontario Ministry of Agriculture, Guelph, ON, Canada and Thomas W. Bruulsema, International Plant Nutrition Institute, Guelph, ON, Canada