Applications of PSM significantly improves yield of maize on Ultisol from Jatinangor, Indonesia but has no real effect towards potential-P, available-P, phosphatase and P uptake of plants. Application of PSM which is a mix inoculant of PSB and PSF gave better effects on available-P in soil and yield of maize. The P fertilizer with a dose of 25%, 50%, 75% and 100% recommendation increase soil available-P significantly. Increasing doses of P fertilizer can inhibit the activity of phosphatase. Phosphate fertilizer with 50% recommendations dose gave better effects on potential-P in soil and maize yields