Efficiency of New Derivatives of Pyrazolopyridines as Soy Growth Regulators

In modern agriculture, plant growth regulators are used to increase crop yields, the role of which is to control and accelerate plant life processes, increase stress resistance and stimulate their development. The study investigated substances in a number of derivatives of pyrazolopyridines as regulators of soybean plant growth. For this purpose, a series of new compounds of this class was synthesized and bioscreening was carried out in first laboratory, then field small-scale experiments. Field experiments were conducted at the experimental field of the Kuban State Agricultural University named after I.T. Trublin using soybean crops of the Slavia variety. Vegetative soybean plants were treated with an aqueous solution of a growth regulator twice: in the 4–5 leaf phase and in the budding–branching phase. According to the experimental data, the use of potential growth regulators Ia, If and Ih allowed to increase crop yields by 12.0, 18.0 and 15.4%, respectively, in comparison with untreated plants. At the same time, the number of beans, the number and weight of seeds per plant, as well as the weight of 1000 seeds increased. The grain quality improved: the protein content increased by 0.7–2.2%, and the oil content increased by 0.5–2.4% relative to the control. Under the influence of growth regulators, the photosynthetic activity of plants increased: the content of chlorophyll a in the treated plants was higher than in the control variant by 7–15% throughout the growing season, and chlorophyll b by 6–25%.