TY JOUR TI QUANTITATIVE ANALYSIS OF THE STATE AND PRESERVATION OF TEST CULTURES BIRCH THAT DIFFER BY AUTO- AND ALLOGAMY KW downy birch KW silver birch KW hybridization KW drought tolerance KW test cultures JO Actual directions of scientific researches of the XXI century: theory and practice AU Isakov, I.Y. PY 2020 IS 8 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov