ADAPTABILITY OF SOYBEAN UNDER COMPLEX TREATMENT WITH BIOPREPARATIONS OF DIFFERENT NATURE IN CONDITIONS OF ORGANIC FARMING AND HYDROTHERMAL STRESS
DOI: http://dx.doi.org/10.30970/sbi.1904.852
Abstract
Background. In organic farming conditions and increasing hydrothermal stress, the use of biological preparations as effective tools for improving the adaptability of soybeans is becoming particularly relevant. The integrated application of arbuscular mycorrhizal fungi, nitrogen-fixing bacteria, and phytohormonal regulators allows activating the plant physiological and biochemical processes. This biotechnological approach provides mitigation of the negative impact of hydrothermal stresses and maintains crop productivity even under unfavorable growing conditions.
Materials and Methods. The object of the study is the total chlorophyll content, leaf surface area, proline, and malondialdehyde (MDA) concentration, as well as the productivity of soybeans Khorol variety under unstable moisture conditions and influenced by rhizosphere microorganisms and various phytohormones in the composition of the biopreparations. Field, laboratory (physiological, biochemical), and statistical methods were used.
Results. The use of biopreparations improved biochemical, physiological, and morphological properties, as well as soybean productivity, indicating an improved plant status. The highest levels of total Chl (a+b) content were recorded in 2023 under the combined application of Mycofriend, Profix, and Violar, showing an average increase of 42.3 % and 26.7 % compared to the control, respectively. The leaf area reached 29.24 thousand m²/ha, while the yield amounted to 3.23 t/ha, exceeding the control by 28.9 % and 47.5 %, respectively. The elevated proline content (7.27 mg/g) and a lower MDA level (7.14 mg/g) during stress reflect reduced oxidative damage and better osmoregulation due to the synergistic action of mycorrhiza, rhizobia, and phytohormones.
Conclusion. The complex application of biopreparations (Mycofriend + Profix + Violar) in the organic cultivation system of the soybean Khorol variety promotes the activation of physiological and biochemical processes, increasing productivity and plant stress resistance under hydrothermal stress conditions.
Keywords
arbuscular mycorrhizal fungi, phytohormonal regulators, chlorophylls, leaf area, yield, proline, malondialdehyde
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