Dynamics of the structural state and enzymatic activity of calcic chernozem under the influence of biologically active drugsMarina Dubinina, Olga Bezuglova, Vladimir Lychman, Olga Naimi and Elena PolienkoE3S Web Conf., 273 (2021) 05004DOI: https://doi.org/10.1051/e3sconf/202127305004