Result showed that the decrease of early potential-P from 33,37 mg 100 g-1 up to 6.98 mg 100 g-1 proved mix inoculant of PSB and PSF acitivity in dissolving P in Ultisol. Giving of various inoculant did not give significant results against available-P, although the results showed an increasing number from control to mix inoculant of PSF and PSB (Table 2). According to Fitriatin et al. (2013), the higher the population of PSB would increase the available-P in soil. Therefore, giving mix inoculant of PSB and PSF was better than giving inoculant independently. Mix inoculant of PSB and PSF also supported the growth of maize roots significantly up to 18,18% compared with control