Biohumus “Sis” for the ecologically pure agricultural production Tatevik A. Jhangiryan, Albert O. Markosyan, Hovhannes K. Yeritsyan, Julia Valeeva, Margarit T. Petrosyan and Gulnara Valeeva BIO Web Conf., 52 (2022) 00068 Published online: 21 September 2022 DOI: 10.1051/bioconf/20225200068