Abstract.
The issue of increasing resistance to extreme factors is becoming increasingly important, the relevance of the search for methods and ways to reduce the impact of abiotic stresses (droughts, high temperatures, frosts) on the implementation of the adaptive potential of agricultural crops is growing. For some unfavorable factors, the antistress activity of phytohormones, microelements and micronutrients was investigated, however, the greatest efficiency can be achieved through the combination of the necessary nutrients, hormones and growth regulators in an optimal rate. The aim of the work was establishing the effectiveness of the combined application of fertilizers, stress protectors and plant growth regulators to mitigate the effects of abiotic stresses. One of the tasks was to determine the optimal doses and methods of applying stress protectors. In a laboratory experiment, the effect on seed germination (by indications: sprouting, energy friendliness and germination rate), identified a set of components for complexing in the integrated products. As a result, we created two complex stress-protective fertilizers (sets of separate preparations) to mitigate the effects of abiotic stresses. The first one - SPs, is intended for seed treatment before sowing; it includes a complex of trace elements, sodium tripolyphosphate, phytohormones and silicon, as well as a naturally occurring polysaccharide lipogenic composition. The second preparation - SPf, intended for foliar fertilizing plants, contains the same components, as well as a complex of L-configuration amino acids and macronutrients in mineral form. The effect of complex preparations against the background of mineral fertilization (N30P30K30) was investigated in two small-plot experiments on barley crops. The greatest effect on the barley yield was recorded when combining mineral fertilizers with the use of pre-sowing seed treatment with SPs at a rate of 1 l/t and a one-time foliar fertilizing plants during the growing season with SPf at a rate of 1.0 l/ha or 0.5 l/ha twice during vegetation.
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