A study included the implementation of a field experiment using a randomized complete Block design at the Agricultural Research Station - College of Agriculture - University of Al-Muthanna, to evaluate the effect of using the immobilization inoculant technique as a biofertilizer compared to applying the bacterial inoculant in the traditional methods by carrying it on zeolite. The results showed the superiority of the immobilization inoculant, regardless of the type of bacterial inoculum on the process of carrying on zeolites in all traits corn growth parameters, as well as the overlap of T. thiolates + B. subtilis together over the bacterial inoculant for B. Subtilis. At the same time, it didn't differ significantly in most of the traits. The study of the dual bacterial inoculant B3M2 superior in plant height, dry weight, bio-yield, grain yield, uptake amount of nitrogen, phosphorus and potassium in the shoots and the concentration of available phosphorus in the soil. Which is recorded at 227.33 Cm, 321.23 g plant-1, 171.44 g, 7.68 t ha-1, 89.21 (kg N ha-1), 21.92 (kg P ha-1), 171.82 (kg K ha-1), 29.6 (mg P ha-1) Sequentially, the same treatment also achieved 99.6% compared to the recommendation of the complete fertilizer in the grain yield.
Keywords: Bacterial Inoculant, Growth, Yield, Corn (Zea Mays L.)