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Table 1 Study references for plant growth promoting bacteria used in combination with humic substances

From: Plant growth promoting bacteria and humic substances: crop promotion and mechanisms of action

References Treatments Main results
Valero et al. [58] Humic acid biologically extracted from low-rank coal inoculated with a mixed microbial inoculum of coal solubilizing bacteria (Bacillus mycoides, Acinetobacter baumannii, and Microbacterium sp.) Edaphic substrate improvements (cation exchange capacity and microbial activity) and increase in the dry weight and the total contents of N and P in the maize seedlings
Bacilio et al. [61] Humic acids and Pseudomonas stutzeri were inoculated in chili pepper Mitigation of salinity effects
Esringü et al. [62] Hungarian vetch; three PGPB strains—Agrobacterium rubi strain A1, Bacillus subtilis strain OSU-142 and Bacillus megaterium strain M3; commercial K+-humate Mitigation of salinity effects
Schoebitz et al. [53] Blueberry seedlings: microbial consortium (Bacillus subtilis, B. licheniformis, B. megaterium, B. polymyxa, B. macerans, Pseudomonas fluorescens, P. putida, Nocardia corallina, Saccharomyces cerevisiae and Trichoderma viride). 15 g of humic substances from Leonardite (powder form) was added per seedling Enhance on plant biomass;—enhance on nutrient uptake (N and K);—changes on the bacteria community at rhizosphere
Ahmad et al. [57] Acinetobacter pittii and humic acids Enhance on crop yield and nutrient efficiency use
Verma et al. [52] Cabbage: Pseudomonas fluorescens and humic acid Nutrient efficiency use; crop yield; plant quality
Rodrigues et al. [59] Wheat: Azospirillum brasilense and humic acids Without results on grain yield
Befrozfar et al. [55] Pseudomonas putida, Azospirillum lipoferum, Azotobacter chroococcum and humic acids Growth promotion
Winarso et al. [60] Like humic acids isolated from straw compost and P. putida 27.4B. application directly to the soil and not to the plant Enhance of P availability in soil; without effect on soybean growth
Magdi et al. [54] Bioinoculant with N fixer (Azospirillum and Azotobacter) a P-solubilizer (B. megatherium) bacteria with humic acids applied to cowpea by drip irrigation Nutrient efficiency use
Rekha et al. [56] Pseudomonas putida (estirpe CC-FR2-4) Bacillus subtilis (strain CC-pg104); humic acids Growth promotion; changes in enzymatic activity
Young et al. [63] Bacillus subtilis CCpg104 was attempted with alginate by enriching the bead microenvironment with humic acid Preservation of cell viability; P solubilization and enhance of root and shoot growth of lettuce plants under gnotobiotic (sterile) condition