TY JOUR TI T HE ASSESSMENT OF THE SNOW COVER TOXICITY IN THE KRASNOYARSK PERSONAL PLOTS ACCORDING TO THE SURVIVAL REACTION OF INFUSORIA PARAMECIUM CAUDATUM (EHRENBERG, 1833) AND LETTUCE LACTUCA SATIVA SEED PHYTOTOXICITY KW infusoria KW Paramecium caudatum KW lettuce KW Lactuca sativa KW biotesting KW toxicity KW phytotoxicity JO Bulletin of KSAU AU Shadrin, I.A. AU Napesochnuy, N.S. PY 2013 IS PB Krasnoyarsk State Agrarian University