TY JOUR TI PERENNIAL GRASS CENOTIC ACTIVITY IN THE SECOND YEAR OF GROWTH DEPENDING ON THE NITROGENOUS FERTILIZER NORM IN THE PRIMORSKY REGION CONDITIONS KW perennial grasses KW grass mixtures KW mineral fertilizers KW cenotic activity KW yield structure JO Bulletin of KSAU AU Ryzhenko, O.V. PY 2012 IS PB Krasnoyarsk State Agrarian University