TY JOUR TI SPRING BARLEY - MAIN FEED CROP OF THE REPUBLIC OF MARI EL KW spring barley KW varieties KW fertilizers KW grain productivity KW crude protein KW harvesting of fodder units. JO Vestnik of Kazan State Agrarian University AU Zolotoreva, R.. AU Vinogradov , G.. AU Maksimov, V.. AU Ivanova, L.. PY 2016 IS 11 PB Kazan state agrarian University