Raievska, I. and Schogolev, A. 2025. Photoperiod-induced changes in total nitrogen and soluble protein content in soybean leaves. The Journal of V.N.Karazin Kharkiv National University. Series «Biology». 44, (Jul. 2025), 131-139. DOI:https://doi.org/10.26565/2075-5457-2025-44-11.