The effectiveness of using biological preparations in the production technology for seed material of potatoesMaya Orzaliyeva, Yelena Didanova, Timur Zherukov, Khusen Nazranov and Akrom IshnazarovE3S Web Conf., 262 (2021) 01028DOI: https://doi.org/10.1051/e3sconf/202126201028