Formation of spring barley productivity depending on seed inoculation with a biopreparation and foliar fertilization in the Steppe of Ukraine

Scientifically substantiated application the elements of technologies with the use of microbiological preparations, macro- and microfertilizers, new growth regulators of plants of organic origin, allows not only to increase grain yields, improve its quality, but also to affect the economic efficiency of spring barley cultivation. Today, biological, growth stimulants are widely used in various types of agricultural crops. They are an effective method of achieving increased productivity, increasing resistance to diseases and pests, which, in turn, makes them attractive to researchers. The introduction of biologically active substances in agricultural practice is impossible without a deep and comprehensive study of their effect on the growth and development of the plant, as it depends on the type of preparation, rate, processing time, varietal characteristics of the crop, and other factors. The aim of our research was to evaluate the effect of biopreparation of phosphorus mobilizing action and foliar fertilization with macro- and microfertilizers on the formation of spring barley productivity at sowing after predecessors of soybean, winter wheat, sunflower, and corn for grain in conditions of unstable soil moisture in Steppe zone. Due to significant fluctuations in weather conditions during the growing season of spring barley, by the bree­ding of ecologically adapted varieties, predecessors and using elements of technology that involve the seed treatment with biopreparations and foliar fertilization in the tillering phase of plants, one can consistently obtain grain yields at 4.32−5.23 t/ha. Improving the nutrient regime of the soil with the use of the preparation Polymyxobacterin based on the growth-stimulating bacterium Paenibacillus polimyxa KB contributed to the improvement of plant nutrition and increased the crop yield of spring barley by 0.17−0.65 t/ha depending on the predecessor. The increase in grain yield of spring barley from the use of foliar fertilizers with macro-and microfertilizers was 0.29−0.41 t/ha. The highest level of grain yield (5.68 and 5.18 t/ha) when sowing spring barley variety Statok after predecessors soybean and sunflower obtained in the trial of inoculation with phosphorus mobilizing preparation Polymyxobacterin and fertilization in the tillering phase with micro-fertilizer Reakom, after grain crops – 5.19 t/ha Polymyxobacterin + CAM 28, N8, after corn for grain – 4.92 t/ha, Polymyxobacterin + Urea, N8. The increase compared to control was 0.83 t/ha, 0.95; 0.83 and 1.25 t/ha respectively, by predecessors. The use of biopreparations based on effective microorganisms should be an integral aspect of modern agriculture, taking into account climate changes. The practical value of using biological preparations for seed inoculation before sowing in combination with foliar fertilization of macro- and microfertilizers in the period of formation of the generative organs is due not only to their efficiency but also the low cost of their use, which is an element of resource-saving technologies and eliminates environmental pollution.