Problems of field contamination when growing energy corn as monoculture Mykola Korchak, Serhii Yermakov, Vasyl Maisus, Serhiy Oleksiyko, Vitaliy Pukas and Iryna Zavadskaya E3S Web Conf., 154 (2020) 01009 Published online: 09 March 2020 DOI: 10.1051/e3sconf/202015401009