TY JOUR TI Efficiency of application of “Epin-extra” and “Zircon” biostimulants on potato landings in agroecological conditions of Republic of North Ossetia-Alania KW biostimulator KW Epin-extra KW Zircon KW mineral fertilizer KW potato KW productivity KW preplant treatment. JO Agrarian Bulletin of the AU Gazdanova, I.O. AU Gerieva, F.T. AU Morgoev, T.A. PY 2020 IS 199 PB Ural State Agrarian University