Fig. 4

Spatial pattern of crop-specific fertilizer (K₂O) kg ha -1 consumed by each  5-arcmin grid cell for the following: (a) average for the 1960s decade across all 13 crop classes, (b) average for the 1960s decade for wheat, (c) average for the 1960s decade for rice, (d) average for the 1960s decade for maize, (e) average for the 1960s decade for other cereals, (f) average for the 1960s decade for all oil crops, (g) average for the 1960s decade for vegetables and fruits, (h) average for the 1960s decade for roots and tubers, sugar crops, fiber crops, and other crop classes, (i) average for the 2010s decade across all 13 crop classes, (j) average for the 2010s decade for wheat, (k) average for the 2010s decade for rice, (l) average for the 2010s decade for maize, (m) average for the 2010s decade for other cereals, (n) average for the 2010s decade for all oil crops, (o) average for the 2010s decade for vegetables and fruits, (p) average for the 2010s decade for roots and tubers, sugar crops, fiber crops, and other crop classes. The 1960s decade includes the years 1961–1969, and the 2010s decade includes the years 2010–2019.