Inoculation Effect of Some Phosphatic Microbial Fertilizers on Nutritional Indices of Zea mays L.

In this study the effectiveness of phosphatic microbial fertilizers produced from seven bacteria (Pantoea agglomerans P5, Pseudomonas fluorescens Tabriz, P. putida Tabriz, Pseudomonas sp. C16-2O, Enterobacter sp. S16-3, Bacillus megaterium JK6 and B. firmus) in the basal formulation of rock phosphate (45 g), bagasse (30 g) and sulfur (15 g) were evaluated. In this experiment, Pantoea agglomerans P5 which used in Barvar2 biofertilizer was applied as a positive control. The results obtained from the greenhouse experiments showed that the wet and dry weight of roots and shoots, uptake of potassium, iron and zinc in the root and shoot of corn S.C.704 were significantly influenced by the PMFs. In most measured parameters, the effects of Enterobacter sp. S16-3 and Pseudomonas sp. C16-2O were similar to the P. agglomerans P5 and all the three treatments in most cases had higher performance than TSP. P. fluorescens and P. putida treatments showed similar effects on corn growth. It should be noted that B. firmus in some cases and B. megaterium treatment in most parameters had lower performance compared to the treatment bed without bacteria (negative control) and even lower than the treatment without fertilizer bed (No Carrier). It should be emphasized that the effect of different levels of fertilizer consumption (0.6 and 1.2 g pot-1 equal to 100% and 200% of recommended dose of phosphorus) were significant and the level of 1.2 g pot-1 compared to 0.6 g pot-1 caused an increase more than two-fold in plant performance.