Abstract
The article considers the prospects of using microbiological preparations for growing planting material of valuable and rare juniper species whose natural regeneration is difficult. The aim of the study was to evaluate the effect of multifunctional microbiological preparations based on antagonist fungi (genus Trichoderma) and rhizobacteria (genera Bacillus and Pseudo-monas) on the growth parameters of Juniperus spp. cuttings with the identification of the features of species-specific response in open ground conditions of the Omsk Region. The objects of the study were juniper seedlings of different ages of the species J. communis L., J. sabina L., J. horizontalis Moench. (‘Blue Chip’ and ‘Limeglow’ cultivars). Treatment with biological preparations was carried out by a single watering under the root (100 ml/plant for 1-2-year-old seedlings and 200 ml/plant for 3-4-year-olds). The control underwent water treatment, with Fundazol as the fungicidal standard, and Kornevin as the growth standard. During the 2021–2024 study period, there has been established the high efficacy of microbiological prepara-tions for stimulating the growth and development of Juniperus spp. seedlings. Universal bioagents were identified: the micro-biological fertilizer Azolen and the biofungicide Elena consistently increased key morphometric parameters (height by 10–33 % and 7–57 %, root collar diameter by 11–31 % and 8–59 %, respectively) in all studied taxa. A species-specific response was demonstrated for Trichoderma veride, Black Yeast, and Flavobacterin, confirming the hypothesis of specific interactions in the microorganism–plant system. The results make it possible to recommend Azolen and Elena for use in juniper planting technology.