Yield and quality of soybean cultivars depending on cultivation technology elements

Purpose. To determine the yield and quality of soybean cultivars ‘Aratta’, ‘Cordoba’, and ‘Feieriia’ under the influence of micronutrients and growth regulators. Methods. The research was carried out in 2020–2022 at the Verkhniachka Experimental Breeding Station of the Institute of Bioenergy Crops and Sugar Beet, in the zone of unstable moisture in the Right-Bank Forest-Steppe of Ukraine. The field experiment was laid out according to the following design: factor A – soybean varieties (‘Aratta’, ‘Cordoba’, and ‘Feieria’); factor B – micronutrients [without micronutrient; Yara Vita Mono Molitrak at the budding stage (0.25 l/ha); Yara Vita Mono Molitrak at the budding stage (0.25 l/ha) + Yara Vita Mono Molitrak at the flowering stage (0.25 l/ha)]; factor C – growth regulators (without growth regulator; Biosyl; Radostym). Results. It was established that the highest yield of the ‘Aratta’ variety was achieved using a combination of Yara Vita Mono Molitrak during the budding phase (0.25 l/ha) and the microfertiliser Radostym − 2.35 t/ha. Other effective combinations included Yara Vita Mono Molitrak during both the budding and flowering phases (0.25 l/ha each), with growth regulators Biosil and Radostym, yielding 2.34 and 2.35 t/ha, respectively. The 'Cordoba' variety showed yields of 2.40, 2.41, and 2.45 t/ha under similar treatment combinations. The highest productivity levels for the ‘Feieria’ variety were also obtained using these treatments. For ‘Aratta’, the maximum 1000-kernel weight was achieved with Yara Vita Mono Molitrak during budding and flowering phases + growth regulator Radostym − 144.0 g. Conclusions. The highest protein content in ‘Aratta’ seeds was recorded with combinations of Yara Vita Mono Molitrak in the budding and flowering phases + growth regulators Biosyl and Radostym − 38.5% and 39.6%, respectively. For ‘Cordoba’, better results were obtained with Yara Vita Mono Molitrak applied in the budding phase + Radostym − 43.5%, and in the flowering phase + Biosil/ Radostym − 43.3% and 44.3%. For ‘Feieria’, combining Yara Vita Mono Molitrak in the budding and flowering phases with Biosyl or Radostym resulted in protein contents of 41.2% and 41.7%, respectively.