Figure 4From: Terrestrial denitrification: challenges and opportunitiesAnalysis of the fates of fertilizer N added over 22 years in an Iowa watershed with continuous corn show large amounts of “unaccounted for (lost or stored) N.” Given that these agricultural soils are likely not accumulating organic N, the vast majority of the “lost or stored” N was likely denitrified. From Steinheimer et al. (1998).Back to article page