In field experiments conducted in the zone of unstable humidification of the Stavropol Krai in 2023- 2024, the positive effect of multifunctional preparations Biosil, Alfastim, Fylloton, Ikar Elais, and Ikar Fosto on winter wheat plants of Victoria 11 variety against the background of the use of mineral fertilizers was established. It was shown that plants treated with preparations in the phases of the beginning of tube entry and earing increased height growth, and the content of photosynthetic pigments - chlorophyll a, chlorophyll b, and carotenoids - increased in the aboveground organs. The effect of preparations on growth and pigment content was most pronounced under the stress of the spring drought (2024), while the content of total chlorophyll and carotenoids in flag leaves increased relative to the control by 15.2-38.8 and 20.0-46.2%, respectively. Treatment of crops with preparations increased the gain in dry weight of plants in the earing, milk and wax ripeness phases, and increased the biological yield of grain by an average of 7.7-20.2% over 2 years compared to the control, and the highest yield was obtained with the use of Biosil and Fylloton preparations. Improvement of quality indicators and of grain grade (up to the 2nd grade level) in relation to control were noted in the conditions of 2024 in variants using Biosil, Ikar Elais, and Ikar Fosto preparations. Ikar Fosto had the greatest effect on grain quality.
E. S. Davidyants (Thu,) studied this question.