Extended Data Fig. 3
Mapping the manure N and crop N ratio in United States in 1992 (a) and 2012 (b), and synthetic fertilizer use in 1992 (c) and 2012 (d).
Extended Data Fig. 3 | Nature Food
Mapping the manure N and crop N ratio in United States in 1992 (a) and 2012 (b), and synthetic fertilizer use in 1992 (c) and 2012 (d).
