TY JOUR TI GRASS MIXTURES FOR THE CREATION OF HIGH-QUALITY INTENSIVE HAYMAKING IN THE SEMI-DESERT ZONE OF RUSSIA KW legume-bluegrass grass mixtures KW productivity KW fodder units KW approbation KW agrophytocenoses KW haymaking JO Vestnik of Kazan State Agrarian University AU Tyutyuma, N.V. AU Egorova, G.S. AU Kudryashova, N.I. PY 2024 IS 19 PB Kazan state agrarian University