Plant growth-promoting rhizobacteria (PGPR) are eco-friendly and sustainable options for agrochemicals, particularly for enhancing crop productivity under stress conditions. The present research aims to isolate and characterize native PGPR from tomato rhizospheric soil and to evaluate their effectiveness as a dose-dependent response to enhance the growth of tomato seedlings. Out of 112 isolates, 10 bacterial strains were selected based on key PGPR traits, including indole-3-acetic acid (IAA), ammonia production, hydrogen cyanide (HCN), exopolysaccharide (EPS) synthesis, hydrolytic enzyme activity, potassium solubilization, antifungal activity against Fusarium oxysporum, and tolerance to pH and heat stress. Molecular identification via 16S rRNA gene sequencing confirmed that these isolates belong to the genera Serratia and Enterobacter. S. marcescens So-1 and Enterobacter sp. So-12 produced the highest levels of IAA (2.6–24.1 µg/mL). In vitro tomato seed germination tests using bacterial suspensions at three concentrations (10⁶, 10⁷, and 10⁸ CFU/mL) showed dose-dependent improvements, with T1 increasing germination up to 108.3% compared to the control. In polyhouse trials using cocopeat formulations, seedling growth improved noticeably. T2 increased the root length (28.3 ± 2.98 cm) by over 1560%, and the shoot length (35.7 ± 0.57 cm) increased by 55% against the control, whose root length is 1.7 ± 0.47. The chlorophyll amount of the treated leaves further showed significant results over the control. Collectively, these findings suggest that using native PGPR in a dose-dependent way can help tomato seedlings grow better and promote more sustainable crop production.

One of the consequences of climate change is a decline in land productivity, which leads to a decrease in agricultural output. The usage of inorganic fertilizers will result in a greater reduction in land quality. Vermicompost and plant growth-promoting rhizobacteria (PGPR) are two other answers to these issues. These manures include organically bonded micro and macro elements that impact the growth and development of plants, as well as soil sustainability. The favourable consequences of PGPR on soil and crop were improved by vermicompost, with the level of promotion dependent on vermicompost dosage and crop type. The PGPR dramatically decreased soil carbon and nitrogen while increasing the soil’s microbe-biomass nitrogen and carbon in the presence of vermicompost. Vermicomposting is a low-tech, ecologically benign method of treating organic waste. Application of vermicompost with PGPR in an effort to mitigate climate change by promoting crop growth and production. This study, which also serves as a review, will show how PGPR and vermicompost can be utilized to promote sustainable agriculture while reducing the usage of synthetic manure and the role of vermicomposting in salt conditions and their effects on plants. The major goal of this review is to give information on the earthworm-microbe-soil-vermicompost interaction dynamics.