UDC 633.858.52(470.65)
DOI 10.36461/NP.2025.74.2.009

SYMBIOTIC PRODUCTIVITY OF SOYBEAN VARIETIES WITH PHOSPHORUS-POTASSIUM FERTILIZERS APPLICATION
Tedeeva V.V., Candidate of Agricultural Sciences, Senior Researcher,
Tedeeva A.A., Candidate of Biological Sciences, Senior Researcher
North Caucasian Research Institute of Mountain and Piedmont Agriculture – the Affiliate of Vladikavkaz Scientific Centre of the Russian Academy of Science 363110, North Ossetia-Alania, Mikhailovskoe village, 1 Williams Street. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

The research was aimed at assessing the effect of different doses of phosphorus-potassium fertilizers on production process of new efficient soybean varieties, and their symbiotic productivity in the foothill zone of the Republic of North Ossetia-Alania. The experiments were carried out in the forest-steppe zone of the Republic of North Ossetia-Alania on the lands belonging to the Vladikavkaz Scientific Center of the Russian Academy of Sciences, Prigorodny district, Mikhailovskoye village. The soil of the experimental plot is leached chernozem. Observations were recorded according to the training and methodological handbook for researches in agronomy, Grozny 2012. The objects of the research were soybean varieties: Iriston – locally selected at LLC Research Institute “IRAGRO”; Frost and Lira – selected at FSBSU FSC VNIIMK, Krasnodar. During the research, it was found that the greatest number of nodules were formed on the Iriston soybean variety. Phosphorus-potassium fertilizers application increased the number of nodules on all experimental soybean varieties. For the Iriston soybean variety, the mass of nodules was lower with an increase in the rates of applied fertilizers; the largest nodules were formed in the experimental variant with phosphorus application at a rate of 135 kg/ha. Among examined varieties the most productive was the Iriston variety with the yield of 2.72 t/ha, for the Inei variety – 2.16 t/ha, and for the Lira variety – 2.40 t/ha. The yield of the Iriston soybean variety exceeded the Inei variety by 0.56 t/ha, and the Lira variety by 0.32 t/ha. The application of mineral fertilizers to soybean crops improved symbiotic activity and productivity, increased the amount of fixed nitrogen and, ultimately, the yield. The most efficient indicators were noted for the locally selected Iriston soybean variety with the application of P90 K90 + P60.
Keywords: soybean, variety, symbiotic productivity, forest-steppe zone, mineral fertilizers, general symbiosis, active symbiosis, yield.

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