NiCE chip results for the mock community samples. (a) Mixture of a nitrifier, a denitrifier, and a DNRA bacterium (N. europaea strain NBRC 14298, Pseudomonas aeruginosa strain PAO1, and E. coli K-12 strain MG1655); (b) mixture of various denitrifying bacteria (P. aeruginosa strain PAO1, Bradyrhizobium sp. strain TSA1, Noviherbaspirillum
autotrophicum strain TSA66T); (c) mixture of N2-fixing bacteria (Bradyrhizobium diazoefficiens strain USDA110T, Herbaspirillum seropedicae strain JCM 21448T, and Azospirillum brasilense strain Sp7T).