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Relative abundance (unscaled by total microbial DNA) of top 12 phyla observed in the unamended, stover-amended and PyOM-amended soils (n=8–16). Values beyond 1.5 times the interquartile range are indicated (x), as are values that differ significantly from unamended (*, t-test, P<0.05, Bonferroni-corrected for 72 comparisons).
