UDC 633.63+631.81.095:337
DOI 10.36461/NP.2025.75.3.026

IMPACT OF CULTIVATION CONDITIONS ON PHOTOSYNTHETIC ACTIVITY AND YIELD OF SUGAR BEET CROPS
I.S. Zheryakov, Postgraduate; S.A. Semina, Doctor of Agricultural Sciences, Professor,
E.V. Zheryakov, Candidate of Agricultural Sciences, Associate Professor,
Yu.I. Zheryakova, Candidate of Agricultural Sciences,
O.N. Kukharev, Doctor of Technical Sciences, Professor
Penza State Agrarian University, Penza, Russia e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

The concept of modern agriculture involves the microelement fertilizers application and plant growth regulators (PGR) to obtain highly productive yields. However, in regard to the soil and climatic conditions of the forest-steppe of the Middle Volga region, methods for cultivation of sugar beet with micronutrient fertiliz-ers and PGR treatment have not yet been developed. Optimization of cultivation conditions through the com-bined application of fertilizers with microelements and PGR is one of the methods for increasing the sugar beetproductivity. Current research deals with the results of experiments on the effect of foliar treatment with micronutrient fertilizers and PGR on the photosynthetic activity and yield of sugar beet. Field experiments were carried out in 2024-2025 at Krasnaya Gorka LLC in the Kolyshleisky District of the Penza Region on leached chernozem soils. The experiment was set up in quadruplicate in accordance with generally accepted methods. Micronutrient fertilizers (Mikrovit-7 Bor, Amitsid “Bor”, Mikrovit Standart) and PGR (Furolan, Tsitodef-100, Stimmunol, EF) were used for foliar treatment. Mikrovit Standart provided an increase in the assimilating surface of 14.2%, and Mikrovit-7 Bor and Amitsid “Bor” of 9.2-9.4%. An average leaf surface area of the crop that is close to optimal was achieved by combining Mikrovit Standart with Tsitodef-100. In the con-trol variants without micronutrients, PGR provided an 8.0-12.3% increase in photosynthesis, while when com-bined with micronutrients, the increase was reduced by 1.5-2.0 times. No positive effect of micronutrients or PGR on the intensification of photosynthesis was observed. The Mikrovit Standart microfertilizer had the greatest impact on yield, providing a 13.6% increase. PGR were more effective in treatments without micro-fertilizers, contributing to a 3.1-6.7% increase in root crop yield with a slight advantage for the Stimmunol, EF treatment. No significant difference in yield was observed in combination with microfertilizers, depending on the type of a PGR.
Keywords: sugar beet, microfertilizers, plant growth regulators (PGR), foliar treatment, leaf, photosyn-thesis, yield.

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