TY JOUR TI Studies of the effect of biologically active substances on the growth of European Spruce in Kostroma Region, Russia KW biologically active substances KW growth regulators KW woodless area KW seedlings KW spruce KW stem height KW stem diameter JO Actual directions of scientific researches of the XXI century: theory and practice AU Tretyakov, V.. AU Korenev, I.. AU Bagaev, S.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov