UDC 633.34; 631.8
DOI 10.36461/NP.2025.75.3.009

NET PRODUCTIVITY OF SOYBEAN PHOTOSYNTHESIS AND FORMATION DYNAMICS WITHIN HERBICIDES AND FERTILIZERS APPLICATION
M.A. Magomadov¹, Junior Researcher
M.Sh. Gaplaev¹, Doctor of Agricultural Sciences
A.Kh. Kozyrev², Doctor of Agricultural Sciences, Professor
¹Federal State Budgetary Scientific Institution “Chechen Research Institute of Agriculture”, Chechen Republic, Grozny
²Federal State Budgetary Scientific Institution “North Caucasus Institute of Scientifically Research of Mountain and Foothill Agriculture” – branch of the Federal Scientific Center “Vladikavkaz Scientific Center of the Russian Academy of Sciences”, Republic of North Ossetia-Alania, Mikhailovskoye village, tel.: 8 (918) 7050330, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Scientific interest in soybeans and their use in food, feed and industrial spheres is high nowadays because of their unique nutritional properties. The research deals with the development of new approaches to weed control for high-yielding soybean varieties. The objective of the current research was to identify the influence of mineral balance and various herbicides on the net photosynthetic productivity of soybean crops. Methods: research was carried out from 2022 to 2024 at Chechen Research Institute of Agriculture, located in the forest-steppe zone of the Central Ciscaucasia. The soils are represented by leached chernozem of medium thickness: humus content of 3.9%, available phosphorus of 76-80 mg/kg, exchangeable potassium of 88-91 mg/kg, and soil solution pH of 6.9. The objects of the research were soybean varieties Amadeus, SG SR Pikor, and Smuglyanka, as well as the herbicides Gambit, Hermes, and Bambu. Results: it was found that the highest rates of net photosynthetic productivity were in the initial stages of plant vegetation. Within the flowering phase and further development, when active formation of photosynthetic organs occurred, a gradual decrease in this indicator was observed. At the final stage of the vegetation cycle, a significant decrease in photosynthesis efficiency was noticed. With application of a mineral fertilizer P90 K60, the net productivity of soybean photosynthetic increased at all times of determination. Thus, against unfertilized variant Gambit-3.2 + Hermes-0.9, variety SG SR Pikor, it was 2.80 g/m²×day, and against a mineral fertilizer P90 K60 – 3.18 g/m²×day. Conclusion: herbicides application led to an increase in the net productivity of soybean photosynthetic. High NPV were observed at the beginning of the growing season with the maximum value within the budding-early flowering phase. With mineral fertilizer (P90 K60) application, NPV increased at all measurement times. Among the soybean varieties, the Smuglyanka variety demonstrated the highest NPV.
Keywords: soybeans, varieties, herbicides, mineral background, net photosynthetic productivity.

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