System-cognitive analysis of the economic efficiency of mechanical fallow treatment based on data from the electronic book of field historyN.V. Stepnykh, S.D. Gilev, E.V. Nesterova and A.M. ZargaryanE3S Web of Conf., 222 (2020) 01003DOI: https://doi.org/10.1051/e3sconf/202022201003