Influence of biopreparations on biomass yield and grain efficiency of energy corn Zoya Pustova, Natalia Pustova, Serhii Komarnitskyi, Oleg Tkach, Stepan Zamoiskyi and Alexander Olenyuk E3S Web Conf., 154 (2020) 01008 Published online: 09 March 2020 DOI: 10.1051/e3sconf/202015401008