Until recently, winter wheat nitrogen recommendations were based on research conducted 30 years ago. Production practices have changed significantly, with increased yield potential through better genetics (varieties), use of fungicides, and growth regulators. In the pursuit of higher wheat yields using improved management techniques, N recommendations were found to be insufficient. N recommendations were increased (2012) based on research which is the precursor to this study (Hooker et al, 2014, Johnson and McClure previous CropAdvances).
This study continues the evaluation of nitrogen recommendations, with a shift in focus to the difference in response comparing where fungicides were and were not applied. A wheat nitrogen calculator is the goal to be developed from this and previous research efforts.