Pioneer Hi-Bred Agronomy Research Manager, John Shanahan, say nitrogen (N) is typically the most yield-limiting nutrient for corn production and represents one of the largest economic inputs associated with maximizing returns. He says inaccurate EONR (the point where the last increment of N returns a grain yield increase large enough to pay for that N) estimates result in over-fertilization in some years and under-fertilization in others.
In "Determining Optimum Nitrogen Rates for Corn," Shanahan outlines several methods of developing corn N recommendations, including the "yield goal" or "mass balance" approach and "maximum return to N" approach. Click here to read the entire article.
"Growers must carefully consider the pros and cons of each N management approach, using one or more strategies (or a combination) that maximize profit potential while minimizing risk," says Shanahan.