Evaluation of the growth-promoting attributes of rhizobacteria Bacillus sp. and their influence on the morphophysiological characteristics of rapeseed

Abstract. The use of biofertilizers based on plant growth promoting (PGP) bacteria is a promising direction in agri-biotechnology. purpose was to evaluate the PGP-attributes Bacillus sp. and reveal morphophysiological features rapeseed (Brassica napus L.) when inoculated with these rhizobacteria. Methods. ability strain TO15c isolated from rhizosphere Taraxacum officinale Zack's nitrogen-free medium produce indol-3-acetic acid (IAA) phosphates studied. In pot-scale experiments, assessment changes characteristics upon inoculation rhizobacteria both absence presence nitrogen fertilizer performed. At end 100-day vegetation, shoot length, total leaf area, fresh biomass, content macronutrients photosynthetic pigments were determined. Results. IAA (up 26 mg/L) solubilize phosphate 60 has been proven. Soil ammonium nitrate led increase length by 24 % area 16 %. aboveground biomass increased 1.5 times, underground 2.5 improved. rise pigment (1.5 times average) also noted TO15c. maximum effect achieved combined application. Scientific novelty. effectiveness fertilizer, despite fact that PGPR able fix atmospheric nitrogen.