TY JOUR TI BIOSTIMULATOR MADE OF WASTE OF KERATIN-CONTAINING RAW MATERIALS KW biostimulants KW keratin-containing raw materials KW enzymatic hydrolysis KW organic waste KW amino acids JO Forestry Engineering Journal AU Bryndina, L.V. PY 2020 IS 10 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov