TY JOUR TI STUDY OF VARIETIES OF MEADOW CLOVER DIFFERENT TYPES OF RIPENESS KW red clover KW cultivar KW heterosis breeding KW polycross KW hybridization KW selection KW yield JO Adaptive Fodder Production AU Polyudina, R.I. AU Novoselov, M.Y. PY 2021 IS 2021 PB Federal Williams Research Center of Forage Production and Agroecology