TY JOUR TI THE ENZYMATIC ACTIVITY OF THE LEACHED CHERNOZEM POLLUTED BY COPPER KW leached chernozem KW soil enzymatic activity KW catalase KW invertase KW urease KW protease KW heavy metals KW copper JO Bulletin of KSAU AU Korotchenko, I.S. AU Kiriyenko, N.N. PY 2014 IS PB Krasnoyarsk State Agrarian University