Fertilizer Efficiency of Some Plant Growth Promoting Rhizobacteria for Plant Growth.

Use of biotechnological approaches and processes to increase of soil fertility and productivity, allow to be made sustainable agriculture with less use of chemical fertilizers. So, the aim of this study was to understand the biochemical mechanisms of action of the 10 different plant growth promoting rhizobacteria (PGPR) species (Bacillus megaterium (M3), Pantoea agglomerans (RK-92), Bacillus megaterium (Tv-17C), Bacillus megaterium (Tv-3D), Bacillus megaterium (Tv-87A), Hafnia alvei (Tv-34A), Bacillus megaterium (Tv-60D), Pseudomonas fluorescens (FDG-37), Bacillus megaterium (KBA-10) and Bacillus megaterium (Tv-91C) on their host plant. Results of this study show that the maximum amino acids etc., aspartate, asparagine, glutamine, proline, organic acid etc., malonic acid, oxalic acid and hormone etc., indol-3-acetic acid (IAA), gibberellic acid (GA) and salicylic acid (SA) super oxygen dismutase (SOD), peroxidase (POD) enzyme activity, alkaline phosphatase (ALPA) and acid phosphatase enzyme activity (APA), nutrient concentration of Ca, K, Mg, Na, P, S, N, Cu, Fe, Mn, Zn, B and Al were determined in B. megaterium M3, respectively. The highest cysteine, valin, methionine, tryptophan, isoleucine, leucine butyric acid, maleic acid, were determined from B. megaterium (Tv-17C); the highest urease (UEA) and dehydrogenase (DEA), enzymatic activities were found in Pantoea agglomerans (RK-92) but CAT enzyme activity was detected in Pseudomonas fluorescens (FDG-37). The data suggested that B. megaterium M3, B. megaterium (Tv-17C) and Pantoea agglomerans (RK-92) strains tested have the potential to be used as an organic fertilizer source for plant growth in sustainable and organic farming.