Fig. 2. Responses of gross margins (a) m₁, (b) m₂, and (c) m₃ to applied N predicted for a site-year with end-of-winter mineral soil N equal to 80 kg ha^-1 using models LP-PL-FIXED and LP-PL-RAND. Grain price is fixed and high levels of residual mineral N at harvest are not penalized in m₁. In m₂, grain price depends on grain protein content, and in m₃, high levels of residual mineral N at harvest are penalized

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