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Purpose To reveal if the input of pyrogenic organic matter (PyOM) affects the nitrogen (N) cycling in soil and its N can be used for the synthesis of microbial biomass, we investigated the incorporation of 15N from 15N-enriched grass residues (OM) or their PyOM into extractable amino acids (AAs) of soil organic matter (SOM) from an unburnt and a burnt soil amended with those residues. Materials...