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Relationship between N application rate and (A) maize grain yield (B) grain N (GNU) and total N uptake (TNU) (C) TNU, GNU, and surplus N (SN)-based net N balance (NNB), and (D) N recovery efficiency (NRE) and nitrous oxide emissions (N2O) across Colorado and Indiana (United States), and Quebec and Ontario (Canada) maize production systems. n = number of N rate groups, data points in x-axis represent mean value for the group.
