Content of heavy metals in Haplic Chernozem under conditions of agrogenesis Anna Medvedeva, Olga Buryukova, Alexey Kucherenko, Yaroslav Ilchenko, Victor Chaplygin, Vishnu D. Rajput and Ridvan Kizilkaya E3S Web Conf., 169 (2020) 01024 Published online: 19 May 2020 DOI: 10.1051/e3sconf/202016901024