Laboratory experiments were conducted to study seed germination and growth parameters of corn (Zea mays L.), after treated by 7 treatments using indigenous soil isolates of Bacillus and Pseudomonas in addition to well-known Azospirillum. Results indicated that, seed germination was increased by about 90 % when using the three bacterial isolates in combination, and the ratio was lower when the isolates were used individually.  The growth parameters of corn were examined in greenhouse experiment, the results indicated that, the plant height and dry weight were enhanced by using the three isolates or when using Pseudomonas + Azospirillum in combination