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The aim of this study was the isolation of Pseudomonas sp. and Bacillus sp. strains from rhizospheric soil and monitoring the impact of two isolates denoted as P12 (Pseudomonas sp.) and B1 (Bacillus sp.) on the parameters of English ryegrass (Lolium perenne) yield and activity of the soil microbial communities. During 2012-2014, a plot experiment was set up following the randomized block system. Better effect on the plant growth was recorded with the use of Pseudomonas sp. P12 isolate than with Bacillus sp. B1. Positive effect on the increase in the total number of microorganisms, aminoheterotrophs and azotobacter was also achieved. Bacillus sp. B1 increased only the number of actimycetes. Both isolates positively affected dehydrogenase activity (DHA).
Stamenov et al. (Sun,) studied this question.