The Application of Pseudomonas fluorescens Bacteria Inoculants on Certain Growth Indices and Nutrient Uptake in Maize

The aim of this study was to investigate the potential use of various substances as carriers of bacteria and beneficial effects of growth stimulant bacteria Pseudomonas fluorescens on yield and nutrient uptake of corn. The experiment was done as randomized block with 7 inoculant treatments، 3 phosphorus fertilizer treatments and control in four replicates in Agriculture and Natural Resources College of Tehran University in 2012. Carrier materials were perlite، bentonite، rock phosphate، vermicompost and three formulations of them which Pseudomonas fluorescens suspension was added to them and were stored for 6 months. Population of bacteria was measured at the end of storage period and then inoculated to maize plant. After two months of maize growth، some indicators and nutritive elements of plant such as phosphorus، potassium، iron، copper and zinc were measured in shoots. The results showed that although the amount of the measured factors in triple superphosphate treatment had the highestvalues، but it was not significant different from two superior treatments including vermicompost and perlite + bentonite + vermicompost in many cases (p>0. 05). Zinc and iron in the shoot of superior treatments vermicompost and perlite + bentonite + vermicompost were more suitable and significant difference was observed between zinc in shoot and treatment of triple superphosphate (p<0. 05). Based on the results، application of phosphorus solubilizing bacteria Pseudomonas fluorescens with plant growth promoting matter causes to increase in growth indices and decrease of fertilizer use.