Table 2 World fertilizer N consumption, cereal production, and N use efficiency

World fertilizer N consumption, 2015 (FAOSTAT)

 Total

108,699,171

 Cereal^a

65,219,502

C

World cereal production, 2015 (FAOSTAT)

 Barley

147,413,603

 Maize

1,052,097,073

 Millet

28,218,225

 Oats

23,328,079

 Rice

745,337,946

 Rye

13,755,752

 Sorghum

66,006,062

 Wheat

751,863,360

 Total

2,828,020,100

P

World cereal grain N removal, 2015 (Fujihara et al. 2008)^b

 Barley (N = 21.4 g/kg)

3,154,651

 Maize (N = 13.1 g/kg)

13,782,472

 Millet (N = 20.1 g/kg)

567,186

 Oats (N = 19.1 g/kg)

445,566

 Rice (N = 10.5 g/kg)

7,826,048

 Rye (N = 16.3 g/kg)

224,218

 Sorghum (N = 19.9 g/kg)

1,313,521

Wheat (N = 26.2 g/kg)

19,698,820

 Total

47,012,482

N

Cereal grain N from soil and rainfall, 2015^c

23,506,241

S

 Nitrogen use efficiency

 NUE = [(N – S)/C] × 100 = 36%