Effective of Bacterial Inoculation Azotobacter Chroococcum and Bacillus Subtillis in Inoculation Density and Available Phosphorus in Soil and Plant

Abstract A field experiment was conducted during the agricultural season 2021-2022 with an agricultural area in Al-Nouriah area / Al-Shafi’i district of Al-Diwaniyah Province. Two levels of Azotobacter (A1, A0) inoculation and non-inoculation, as well as the use of two levels of Bacillus subtilis (B1, B0) inoculation and non-inoculation, and four levels of phosphate rock fertilizer (P0, P1, P2, P3) were used. ) kg.h-1 and the interaction between them In addition to the concentration of phosphorous in soil and plants and the numerical density of Azotobacter and Bacillus. A factorial experiment was applied. according to a randomized complete block design (RCBD) with three replications. The results of the statistical analysis showed the least significant difference L.S.D. The interaction treatment (Azotobacter inoculation + Bacillus inoculation + rock phosphate fertilizer) Compared with the control treatment by giving it the highest mean of (phosphorous concentration in soil and plants, number of Azotobacter and number of Bacillus bacteria) amounted to (13.647) mg.kg-1 and (3379) mg.kg-1 and (10.54) CFU/gm Soil x 10-6 and (7.08) CFU/gm Soil x 10-6 respectively.