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Fig. 3. Fate of mineral-15N, residue-15N, or original soil-N redistributed among organic matter fractions after a 90-d incubation. Standard errors shown are for total N in each fraction. Bars with the same uppercase letter within each fraction denote that total N is not significantly different. Means separation for N derived from mineral-N additions and residue-derived N is described in Table 1.
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