419-8 Assessing The Efficacy Of Nitrification and Urease Inhibitors On Nitrous Oxide and Ammonia Emissions In Forage Seed Production In The Saskatchewan Parkland Region.
Poster Number 2723
The aim of this study was to assess the use of urease and nitrification inhibitors in forage seed production to reduce gaseous N losses to the environment and increase NUE. Sites were established in existing forage seed fields at four locations in the Parkland region of Saskatchewan to evaluate the impact of fall and spring applications of urea and three stabilized urea fertilizers on NH3 volatilization and N2O emissions. The fertilizers were urea treated with Agrotain® (a urease inhibitor) and the stabilized fertilizers Alzon® (urea + a nitrification inhibitor) and SuperU® (urea + urease and nitrification inhibitors). Fertilizers were applied in the fall of 2012 and the spring of 2013 at a rate of 92 kg N ha-1. Immediately after fertilizer application in fall, NH3 volatilization was measured consecutively every day until snowfall occurred, and again after snowmelt the following spring. After spring application of fertilizers, NH3 volatilization was measured daily for three weeks. Nitrous oxide emissions were measured twice to thrice per week in the fall of 2012 and in the spring of 2013. Ammonia emissions were measured by connecting forced-drought chambers (chambers through which an air flow is guided) to acid traps (sulfuric acid), followed by colorimetric analysis of the trap solutions. Nitrous oxide emissions were measured by collecting gas samples from non-steady state, vented chambers and analyzing the samples using gas chromatography.