TY JOUR TI The chemical composition of the solid fraction products biogas plant, OOO "NPO "Agrobiogaz" KW biofertilizer KW biogas plant products KW chemical composition. JO Vestnik of Kazan State Agrarian University AU Vasil'ev, O.A. AU Kir'yanov, D.P. PY 2018 IS 12 PB Kazan state agrarian University