B. Malcheva Department Silviculture, Faculty of Forestry, University of Forestry, 1000 Sofia, Bulgaria (Manuscript received 13 May 2025; accepted for publication 28 July 2025) Abstract. The main groups of soil microorganisms were determined in the experimental combination of ammonium

M. Mohamedova, H. Samaliev Abstract. Growth room experiment was carried out to investigate the effect of different temperatures on the efficacy of the rhizobacterium Bacillus subtilis on the development of the root-knot nematode Meloidogyne arenaria. Potato plants (Solanum tuberosum L