In contrast, when the proportion of mineralized amino acid N is
high and all the added amino acids are utilized, then the MIT route is
likely the dominant route. A short-term microcosm study with application
of wheat residues to a silty clay loam soil indicated that 55 and 62%
of N was taken up via the direct route from young (C to N ratio of 12)
and old wheat residue (C to N ratio of 29), respectively (Geisseler et
al., 2009)