Red scarlett potato yield when using elements of a biological agriculture system on gray forest soil of the middle Volga region forest steppeKonstantin V. Vladimirov, Anna N. Kshnikatkina, Vladimir P. Vladimirov and Antonina A. MostyakovaBIO Web Conf., 17 (2020) 00021DOI: https://doi.org/10.1051/bioconf/20201700021