Justification and calculation of design features of drum-type hydroponicsA.A. Sadov, A.D. Ustyugov, I.L. Chukin, K.M. Potetnya and M.V. KholmanskikhE3S Web Conf., 282 (2021) 07014DOI: https://doi.org/10.1051/e3sconf/202128207014