As a result of intensive livestock production in Iowa, large quantities of manure are being produced. Research is needed to evaluate the best way to use this resource. Swine manure contains many nutrients that are essential for plant growth, especially nitrogen (N). A nitrification inhibitor (Stay-N) was used to reduce the rate of conversion of NH₄⁺ to NO₃^- to lessen the potential of leaching losses. The objective of this experiment was to identify the optimum manure rate and determine whether the addition of Stay-N is practical.