Fig. 5: Agronomic efficiency for global cereals.
From: Establishing long-term nitrogen response of global cereals to assess sustainable fertilizer rates
AE increases with Ymax and decreases with increasing Nrate (visualized with isolines of applied nitrogen fertilizer with Y0 set at the mean observed value in LTEs of 2.9 t ha−1). Data points are unscaled observations for the 25 LTEs, with AE at observed Nrate adjusted to the nearest Nrate isoline using equation (3).
