Fig. 3: Nitrogen (N) and phosphorus (P) receiving and sending systems in 1997 (a–c, g–i) and 2016 (d–f, j–l).
From: Physical and virtual nutrient flows in global telecoupled agricultural trade networks
N flows through gross export (a, d), gross import (b, e), and net budget (c, f); P flows through gross export (g, j), gross import (h, k), and net budget (i, l). Net nutrient flows were calculated as the difference between gross physical N (or P) imported and gross physical N (or P) exported. The red and blue colors indicate exporting and importing, respectively; gray color indicates that no data were available. The base map is applied without endorsement from GADM data (https://gadm.org/).
