Rational placement of grain production – the basis for ensuring food security Guzaliya Klychova, Alsou Zakirova, Ilnur Safiullin, Zufar Zakirov, Shaukat Khusainov and Galina Zakharova E3S Web Conf., 175 (2020) 08013 Published online: 29 June 2020 DOI: 10.1051/e3sconf/202017508013