Abstract
The article presents the results of a study on the influence of biopreparations BioSleepBW+Foliar, OrgamicaS+Foliar, (OrganitP+OrganitN+Biodux+Foliar), and Foliar on the seed yield of alfalfa when applied as foliar treatments at the beginning of flowering. The research on alfalfa cultivation was conducted using five different experimental variants. The experiments were carried out on ordinary chernozem soil. The Hydrothermal Coefficient (HTC) values in 2022-2023 were 0,73 – 0,76, respectively, indicating dry conditions. During the budding and flowering periods of alfalfa plants, there was a precipitation deficit, which negatively affected seed yield. The composition of the biopreparations includes a complex of biologically active polyunsaturated fatty acids of the fungus Mortierella alpine with a consumption rate of 3,0-10,0 ml/ha and spores of the strains Beauveria bassiana, Bacillus megaterium-amyloliguefaciens with consumption rates of 1-3 l/ha, with a working solution consumption of 300 l/ha. The research established that the applied biopreparations improve the sowing quality of the seeds. The weight of 1000 seeds remains largely unchanged, serving as a stable indicator, while the agricultural validity of the planting material increases from 79.2% to 84%. This ultimately leads to a 10-20% increase in alfalfa seed yield. The most effective biopreparations influencing seed productivity are Orgamica S+Foliar with a seed yield of 2,0 c/ha, Foliar with 1,86 c/ha, and the OrganitP+OrganitN+Biodux+Foliar complex with 1,82 c/ha, which exceed the control variant by 0,37, 0,28, and 0,05 c/ha, respectively.