The productivity of the vetch and oat mix in crop rotation when using various fertilizer systems in the Vologda regionOlga Vasilievna Chukhina, Larisa Alexandrovna Korelskaya and Nikolai Sergeevich DemidovE3S Web Conf., 262 (2021) 03025DOI: https://doi.org/10.1051/e3sconf/202126203025