Photosynthetic activity and productivity of promising soybean varieties using rhizotorphin and organomineral fertilizer Humifulin

The article presents the results of the study for 2021-2023. The objects were promising soybean varieties bred by the Federal scientific center of legumes and groat crops (Slava and Orleya) and АSТ OJSC (Alisa and Lider 1). The aim of the research was to study the effect of seed inoculation with Rizotorfin, seed treatment and foliar feeding with the growth and development regulator Gumifulin and the combined effect of the preparations on the photosynthetic activity and productivity of promising soybean varieties. A positive reaction of the Alisa variety with the use of Gumifulin was established: the leaf area during the period of fruiting-filling of beans, dry aboveground mass and grain yield increased by 7.0-41.0% compared to the control. The Slava variety responded to all treatments, but responded more actively in most photosynthetic traits when using Gumifulin: leaf area, photosynthetic potential, dry above-ground mass and grain yield in this variant had the highest values and increased relative to the control by 14.0-52.0%. The Orleya variety demonstrated high leaf area, photosynthetic potential, grain yield in the variant with Gumifulin, which was higher than the control by 10.0-48.0% and with a combination of preparations - by 8.0-39.0%. With regard to the Lider 1 variety, responsiveness to the use of preparations was ambiguous. The effect of agricultural practices on the leaf area of the Lider 1 variety manifested itself later than in other varieties in the interphase period of fruit formation - bean filling. A high and medium correlation was revealed between the yield of above-ground mass, leaf area in the period of fruit formation - bean filling and photosynthetic potential with values r = 0.47-0.94.