Environmentally Smart Nitrogen Performance in Northern Great Plains’ Spring Wheat Production Systems

Abstract EN

Experiments were conducted in Montana to evaluate Environmentally Smart Nitrogen (ESN) as a nitrogen (N) source in wheat.

Plots were arranged in a split-plot design with ESN, urea, and a 50%-50% urea-ESN blend at low, medium, and high at-seeding N rates in the subplot, with four replications.

Measurements included grain yield (GY), protein (GP), and N uptake (GNU).

A partial budget economic analysis was performed to assess the net benefits of the three sources.

Average GY varied from 1816 to 5583 kg ha−1 and grain protein (GP) content ranged from 9.1 to 17.3% among site-years.

Urea, ESN, and the blend resulted in higher GYs at 3, 2, and 2 site-years out of 8 evaluated site-years, respectively.

Topdressing N improved GY for all sources.

No trend in GP associated with N source was observed.

With GP-adjusted revenue, farmer would not recover investment costs from ESN or blend compared with urea.

With ESN costing consistently more than urea per unit of N, we recommend urea as N source for spring wheat in Northern Great Plains.