А. Ю. Алборов Field experiments were conducted in the leached chernozem soils of the foothill zone of the Republic of North Ossetia–Alania (characterized as a forest-steppe with a moderately humid climate) to scientifically substantiate cultivation techniques for promising soybean varieties and improve components of adaptive cultivation technology. The research objects were early-ripening soybean varieties Bars and Irbis. For pre-sowing seed treatment, the following were used: rizotorphin (strain 643b), microelements (Mo, Mn, Se), and growth regulators (Epin, Pectin). Classic methods of experiment design, phenological observations, and statistical data processing were applied during the study. It was found that pre-sowing soybean seed treatment with Epin and Pectin creates favourable conditions for the development of legume-rhizobial symbiosis and contributes to the formation of a symbiotic apparatus by 19.7-50.4% more compared to traditional inoculant alone. When combined with Rizotorfin, the mass of active nodules reached 384.8-403.5 kg/ha with Epin and 354.8-358.6 kg/ha with Pectin, surpassing control variants by 49-62% and 33-50%, respectively. The largest assimilating leaf surface was formed in soybean agrocenoses using Pectin (43.1-46.1 thousand m²/ha) and especially Epin (49.1-50.6 thousand m²/ha) against the background of Rizotorphin. The effect of Pectin application was 22.3-23.8%, and that of Epin – 35.0-42.5%. The Bars variety demonstrated a photosynthetic potential 22.8-31.2% higher than the Irbis variety. Maximum symbiotic and photosynthetic activities of crops in the Rizotorphin + Epin treatment ensured the formation of 2.35-2.46 t/ha of seed yield, outperforming control variants by 36.7-42.4%. Among the soybean cultivars, the Bars variety showed a significant advantage, achieving 4.7-10.3% higher seed productivity.
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