TY JOUR TI FACTORS OF HOPE PRODUCTION EFFICIENCY IMPROVING IN THE CHUVASH REPUBLIC KW hops production efficiency KW alpha-acid KW productivity KW estimation KW resource-saving technology. JO Vestnik of Kazan State Agrarian University AU Makushev, A.E. AU Zaharov, A.I. AU Zaharov, D.A. AU Tolstova, M.L. PY 2018 IS 12 PB Kazan state agrarian University