Abstract
Several PGPR have been reported to individually enhance growth, seed emergence and crop yield, and some have been commercialized. This present study investigated the growth promoting abilities of individual species of bacteria as compared to their consortium. Bacteria were isolated and identified from the rhizosphere, rhizoplane and non-rhizosphere of three varieties (Roma Vf, Beske and Ibadan local) of tomato plant. Four isolates (Bacillus subtilis, Pseudomonas aeruginosa, Klebsiella pneumoniae and Citrobacter youngae) were outstanding in in-vitro assays for phosphate solubilisation, ammonia, hydrogen cyanide and indole acetic acid production. Results from the green house study revealed that tomato seed treated with these four isolates and their consortium significantly enhanced the seedling height, stem girth, number of leaves and leaf area. However, tomato seed treated with the consortium showed significant growth above individual cultures. It could be concluded that the consortium of several effective strains for growth enhancement performed better than their individual culture.
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