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Effect of five years of continuous N equivalent fertilizer substitution treatments on the depth distribution of particulate organic N (A), microbial biomass N (B), and dissolved organic N (C) in the profile. ** Significant differences among treatments at p < 0.01, * significant differences among treatments at p < 0.05. OM, organic manure; OM + NF, organic manure with nitrogen fertilizer; NF, nitrogen fertilizer; CK, control.
