Extended Data Fig. 1: Confidence interval of natural terrestrial BNF.
From: Global terrestrial nitrogen fixation and its modification by agriculture
Total BNF rate (kg N ha−1 yr−1) lower (a) and upper bound (b) 68% confidence interval values (analogous to ± 1 standard error). BNF is mapped across terrestrial lands aside from croplands, urban areas, and areas with permanent snow/ice cover.
