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Fig. 1. Optimal N rates as a function of end-of-winter mineral soil N calculated with model LP-PL-RAND for three versions of gross margin (m1, m2, and m3). 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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