This study investigated the effectiveness of two plant growth-promoting rhizobacteria (PGPR) ‎formulations, Bio Arc® 6% WP (BA, Bacillus megaterium) and BECTO Grow Roots® (BGR; ‎Serratia marcescens, Pseudomonas putida, and P. fluorescens). Additionally, it focused on ‎naturally infested soil that had undergone metam potassium fumigation to reduce root-knot ‎nematodes (RKNs), specifically Meloidogyne incognita. It aimed to monitor eggplant response to ‎soil biodiversity changes for 60 days of the experiment under greenhouse conditions. Our data ‎showed that soil fumigation eliminated nematodes and reduced other microorganisms ‎significantly. In sterilized soil, plant fresh root weight significantly decreased after the ‎elimination of soil biota. Moreover, BGR achieved the highest plant growth vigor [fresh root ‎‎(18.48 %), fresh shoot (23.52%), and fresh plant weight (21.03%)], followed by BA [fresh root ‎‎(11.98%), fresh shoot (20.77%), and fresh plant weight (16.38%), respectively]. Plant growth ‎traits increased significantly following the second reinoculation of PGPR after a month. Also, the ‎same data trend was observed in treatments inoculated with RKN+PGPR. Furthermore, BGR ‎treatments exhibited consistent efficacy in controlling nematode infection, maintaining superior ‎vegetative growth compared to BA treatments over time. However, BA treatments displayed a ‎decline in plant growth when faced with repeated nematode infection. The range of gall, egg ‎mass, and second-stage juvenile stages (J2s) numbers diminished after inoculation-infected plants ‎with ‎RKNs and PGPR compared with infected plants