Table 2.

Average recovery (%) of nitrogen fertilizer by maize, rice and wheat as measured using ¹⁵N-labelled fertilizer. (Adapted from Krupnik et al. (2004).)

region	average amount of N fertilizer applied (kg ha−1)	N recovery in crop (%)
		maximum	minimum	mean
Africa	121	59	10	26
Australia	132	77	7	37
Eurasia	117	54	7	31
Europe	156	87	6	43
North America	115	87	6	36
South America	162	86	24	52
South Asia	116	93	7	41