To investigate the response of corn to combined application of chemical fertilizers with RHIZOBACTERIA PLANT GROWTH PROMOTING, an experiment was conducted in 2017 at Research farm of Agricultural and Natural Resources Campus of Tehran University, Karaj, Iran, in a randomized complete block design with four replications. Four nutritional treatments including T1 (Control treatment without applying fertilizer), T2 (Just PGPRs), T3 (Use chemical fertilizers based on soil test) and T4 (T3 + PGPRs) were considered. According to the results, the highest total dry weight (3.9 kg/m2), crop GROWTH rate (79.8 g.m-2.day-1), net assimilation rate (15.3 g.m-2.day-1) and grain yield (18.2 ton.ha-1) were observed in T4 treatment and T2 treatment produced the highest  leaf area index (5.3), leaf area duration (205.2) and specific leaf weight (78.5 g.m-2) . Also, the lowest value of all traits was observed in in T1 (control) treatment. The results showed that the presence of RHIZOBACTERIA PLANT GROWTH promotioninduction in the corn nutrition program increased the GROWTH and GROWTH indices of the PLANT. Combined application of chemical fertilizers with RHIZOBACTERIA PLANT GROWTH PROMOTING resulted in the highest GROWTH and final grain yield of corn.

Rapid human population GROWTH and its consequences of food shortage become a significant concern in recent decades across the world. The untold reasons behind this food shortage were industrialization, urbanization, modern civilization, etc., where the agricultural land has been deployed. With the decreasing farmland and its cultivation, food productivity declined drastically and failed to serve the world’, s vast human population. The present challenge is to increase productivity with the least agricultural land. Thus, excessive chemical fertilizer has been used to quickly turn out more outstanding food production, leading to more significant damages to soil ecosystem and human health. Henceforth, bio-fertilizers find the best alternatives to chemical fertilizers. This study focuses on complete nature of PLANT GROWTH PROMOTING RHIZOBACTERIA, which is used in bio fertilizers for sustainable agricultural productivity and everlasting soil fertility. The characteristics of PLANT GROWTH PROMOTING RHIZOBACTERIA and its role in PLANT GROWTH and formulation of PLANT GROWTH PROMOTING RHIZOBACTERIA biofertilizers have been revealed through intensive literature. The consortium information collected from various literatures brings the unique findings that PLANT GROWTH PROMOTING RHIZOBACTERIA is the natural boon to the global agriculturist. This study discusses PLANT GROWTH PROMOTING RHIZOBACTERIA bacterial strains’,role in protecting the soil from various biotic and abiotic stresses, regulating PLANT GROWTH and its role in producing biofertilizers. Besides, it is transformed into commercial products. Eventually, the future trends and research in PLANT GROWTH PROMOTING RHIZOBACTERIA bio inoculants that promote sustainable agriculture have been elucidated. The microorganism is the bio fertilizer’, s main ingredients, PROMOTING the soil nutrients for efficient PLANT GROWTH and increasing food productivity. Although many microorganisms efficiently contribute to the soil nutrients, this review narrows down to the PLANT GROWTH PROMOTING RHIZOBACTERIA study. Beneficial bacterium plays a vital role in nutrient mineralization and productivity among the various microorganisms. Bio fertilizers containing beneficial bacteria were economically viable and readily available in nature. This review reveals the complete essence of PLANT GROWTH PROMOTING RHIZOBACTERIA and its part in bio fertilizers.

Afield experiment was conducted at Rice Research Station of Tonekabon, Iran, to determine the effect of seed inoculation with PLANT GROWTH-PROMOTING RHIZOBACTERIA on rice grain yield and yield components under different nitrogen (N) rates. The experimental design was a Randomized Complete Block with factorial arrangement and three replicates. Factors included seed inoculation with PLANT GROWTH-PROMOTING RHIZOBACTERIA [control (un-inoculated), seed inoculation with Azospirillum lipoferum, seed inoculation with Azotobacter chroococcum, and seed inoculation with a combination of A. lipoferum and A. chroococcum] and N rates (100%, 75%, and 50% of recommended nitrogen rates, i. e. 100, 75 and 50 kg N ha-1, respectively). Results showed that the highest grain yield (7875 kg ha-1) was recorded for PLANTs inoculated with a combination of A. lipoferum and A. chroococcum, while the lowest one was recorded for un-inoculated control PLANTs. Moreover, rice grain yield, panicle number per m2, grain number per panicle, and 1000-grain weight increased by 9%, 9%, 18%, and 6%, respectively, as N fertilizer rate increased from 50 to 100 kg ha-1. The highest grain yield (7875 kg ha-1) was obtained when N was applied at the rate of 75 kg ha-1 to seeds inoculated with a combination of A. lipoferum and A. chroococcum.

The use of PLANT GROWTH PROMOTING RHIZOBACTERIA, is a solution to reduce the application of chemical fertilizers. In this research, first 51 RHIZOBACTERIA isolated from alfalfa rhizosphere, were screened from PLANT GROWTH PROMOTING point of view. According to the results of the screening of bacteria, 2 Rhizobium isolates, 2 Bacillus isolates and 4 Pseudomonas isolates were selected as superior strains to prepare the inoculums. To evaluate the effect of selected isolates on soybean GROWTH indices, a completely randomized block design was carried out with 12 treatments and 3 replications. Treatments were included 4 Pseudomonas isolates, 2 Bacilli isolates and 2 Rhizobium isolates, mix of Bacillus, Rhizobium and Pseudomonas, control without Fertilizer and bacteria, half of fertilizer recommendation and Fertilizer recommendation. All PLANT GROWTH PROMOTING RHIZOBACTERIA treatments were accompany with Bradyrhizobium. The results indicated that bacteria inoculation significantly increased soybean GROWTH indices, such shoot dry weight, root dry weight, root nodules, pods, seed weight, Fe, Zn, Mn, concentration of shoot, shoot nitrogen and phosphorus uptake compared to the control and the highest shoot Mn concentration was related to T8 treatment and the highest shoot N and P concentrations resulted from T5 (Bacillus), T8 (Rhizobium) and T1 (Pseudomonas) treatments. Generally, Pseudomonas bacteria were more effective than Bacillus and Rhizobium, to increase soybean GROWTH indices and it can be attributed to high PLANT GROWTH PROMOTING properties of bacteria. According to the results, the usage of PLANT GROWTH PROMOTING RHIZOBACTERIA (PGPR), can decrease consumption of chemical fertilizers, especially N and P fertilizers. However, their use in field conditions requires further investigation.