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Concentrations of (A) total N, (B) amino acid-N, (C) NH4+-N and (D) NO3−-N of control plants and plants treated with NH4NO3 of Thuidium tamariscinum and Hylocomium splendens. Values represent means +1 s.e.; n=5. Significant differences (P<0·05) are indicated by different letters; n.s., not significant.
