TY JOUR TI TO ASSESS THE INTERACTION OF THE SPECIES OF PERENNIAL BLUEGRASS GRASS (Poaceae) WITH WHITE CLOVER (Trifolium repens L.) IN MIXED AGROPHYTOCENOSES IN THE CONTEXT OF SEED BIOLOGIZATION KW white clover KW perennial bluegrass grasses KW grass mixtures KW biological nitrogen KW seed production KW yield KW seeds JO Adaptive Fodder Production AU Zolotarev, V.N. PY 2020 IS 2020 PB Federal Williams Research Center of Forage Production and Agroecology