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

Table 8

(a) Protein-unadjusted and -adjusted revenues and marginal returns for selected site-years where grain yield was significant. (b) Protein-unadjusted and -adjusted partial budget analysis comparing medium at-seeding rate (112 and 224 N kg ha⁻¹ at Conrad and Kalispell, resp.) and low at-seeding rate (56 and 112 kg ha⁻¹ at Conrad and Kalispell, resp.) along 45 kg ha⁻¹ topdress N rates for selected site-years.

(a)

Site-year	Unadjusted for protein			Adjusted for protein
	Urea	ESN	Blend	Urea	ESN	Blend
	Net return,  ha^−1
Conrad-2012	648.79	650.27	669.31	536.35	448.05	529.48
Corvallis-2012	243.93	74.26	126.42	209.16	15.08	55.68
Kalispell-2011	335.39	280.13	343.68	240.45	165.70	225.31
	Marginal profit,  ha^−1
Conrad-2012	—	1.48	20.50	—	−88.30	−6.85
Corvallis-2012	—	−169.67	−117.51	—	−194.08	−153.50
Kalispell-2011	—	−55.26	8.29	—	−74.75	−15.13
	Marginal rate of return, recovery investment
Conrad-2012	—	1.02	1.56	—	−0.31	0.81
Corvallis-2012	—	−0.89	−1.41	—	−1.17	−2.14
Kalispell-2011	—	0.38	1.17	—	0.17	0.69

(b)

Site-year	Unadjusted for protein		Adjusted GY for protein
	Urea	ESN	Urea	ESN
	Net return,  ha^−1
Conrad-2011	612.68	134.32	502.94	43.38
Conrad-2013	533.88	374.48	479.36	276.45
Kalispell-2011	352.49	255.31	252.67	145.16
	Marginal profit,  ha^−1
Conrad-2011	—	−426.36		−459.56
Conrad-2013	—	−85.00		−202.91
Kalispell-2011	—	−22.78		−107.51
	Marginal rate of return, recovery investment
Conrad-2011	—	−8.20		−7.84
Conrad-2013	—	−1.14		−1.73
Kalispell-2011	—	−0.31		−0.45