EFFECTIVENESS OF FOLIAR FERTILIZATION OF SPRING BARLEY (HORDEUM VULGARE L.) UNDER THE CONDITIONS OF THE FOREST-STEPPE ZONE OF UKRAINE

The aim of the present study was to determine the effectiveness of foliar applications of biological products from the company “ORGANICIA”: Mega Vrozhai Start (PRIME) (2.5 L/ha) + fungicide Combo (2 L/ha) + insecticide Metabo (1 L/ha) + BIOPRULUPACH (0.2 L/ha) in shaping the productivity of spring barley (Hordeum vulgare L.) under the conditions of the Forest-Steppe zone of Ukraine. The current state of the biological intensification of cereal crop cultivation technologies was analyzed, and the feasibility of using microbiological products as an alternative or supplement to traditional nutrient management systems was justified. It was established that under unstable temperature regimes and water deficit in 2025, foliar fertilization contributed to increased plant survival, intensified photosynthetic activity, and improved formation of yield structure elements. Experimental studies were conducted on typical medium-humus chernozem soil with four replicates using biological products applied during the tillering phase (BBCH 24–26) and the flag leaf stage (BBCH 37), as well as their combination. It was demonstrated that the largest leaf area (38.4 thousand m²/ha), the highest individual productivity indicators (46.9 grains per plant, 1000-grain weight – 55.3 g), and maximum yield (6.2 t/ha) were achieved with double foliar application. The yield increase compared to the control was 2.1 t/ha, or 33.9 %. The application of bioproducts positively influenced the formation of productive stems, grain weight per plant, and 1000-grain weight, which determined the overall increase in crop productivity. The results obtained confirm the effectiveness of the integrated use of biological products from the company “ORGANICIA”: Mega Vrozhai Start (PRIME) (2.5 L/ha) + fungicide Combo (2 L/ha) + insecticide Metabo (1 L/ha) + BIOPRULUPACH (0.2 L/ha) in the foliar fertilization system of spring barley and justify the feasibility of their implementation for stabilizing yield under conditions of climatic variability.