Effect of Inoculation with Phosphate Solubilizing Bacteria on the Tomato Rhizosphere Colonization Process, Plant Growth and Yield under Organic and Inorganic Fertilization

Abstract: The present study aims to evaluate to which extent a phosphate solubilizing bacteria, Pseudomonas sp. has the ability to colonize the rhizosphere of tomato plants fertilized with different sources of organic and inorganic manures. Another principal object of this study is that the determination of the effect of different types of fertilizers, i.e. mineral NPK fertilizers in the presence of organic manure sources (chicken manure, ChM and pressed olive cake, POC) and inoculation with a phosphate solubilizing bacterial strain on the growth and yield of tomato plants. Seven colonies represent the same morphology as the wild Pseudomonas sp strain were isolated and subjected to the stability test. Only five clones were stables. The growth curve of clone2 (C2) from the five clones was identical as that of its wild strain. This clone was used for the colonization study. The enumerations of stable mutant clone were 1-2 log less than the total. The rhizosphere of plants treated with ChM or ChM+POC at 50% of NPK level showed a forced attractive values for the inoculated clone since its count represents 7.69 and 7.05% of the total bacterial count, respectively. On the contrary, the colonization process was not obvious for plants treated with either the total NPK level or the POC manure. inoculation with Pseudomonas sp. and manuring with the different organic sources had a positive significant effect on tomato leaves phosphorous content