Extended Data Fig. 2: Confidence interval of agricultural 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). N-fixing crop BNF is mapped across the total land area of croplands (by country) and N-fixing forage BNF is mapped across the total land area of grasslands between 67°N/S (thus overlapping with natural grasslands in Extended Data Fig. 1), with rates adjusted to total land areas (see details in Methods and Supplementary Methods).
