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. Author manuscript; available in PMC: 2019 Oct 2.
Published in final edited form as: Soil Biol Biochem. 2018 Dec 7;130:73–81. doi: 10.1016/j.soilbio.2018.12.005

Fig. 4.

Fig. 4

Changes in isotopic enrichment, tracer recovery and concentration of free amino acids (FAA) and NH4+in an Austrian cropland soil amended with cellulose or protein, or remaining untreated (control). 15N enrichment (mean at% 15N of the soil FAA (a) and NH4+ (b) pool, mean tracer recovery in FAA (c) and NH4+ (c) pool and soil FAA and NH4+ pool size over the incubation time (mean ± sd, n = 3). Significant effects from repeated-measures ANOVA are shown in italicized text. Error bars fell within confines of the symbols in some instances.