Mineral salts medium containing mannitol but +NH4+plate lacking NH4+,NO3,or organic nitrogen. -NH4+plate Incubate Soil aerobically NH4+ +NH4+plate Flash -NH4+plate 2012 Pearson Education,Inc. The isolation of Azotobacter(aerobic N2 fixing bacteria)and its relatives.固氮菌的分离The isolation of Azotobacter (aerobic N2- fixing bacteria) and its relatives. 固氮菌的分离 Flash