Research Institute of Mountain Stockbreeding and Agriculture, 5600-Troyan,
281 Vasil Levski Street, Troyan, BULGARIA
Corresponding author: E-mail: email@example.com
Abstract. The growth and development of six variants of legume–grass grasslands were observed in order to assess the productivity and quality of forage of some perennial grass mixtures in the conditions of the Central Balkan Mountain. The mixture of bird’s–foot–trefoil–red fescue demonstrated the highest productivity of dry biomass (749.46 kg/da) for the three years of study, followed by grasslands of red clover together with timothy–grass (734.06 kg/da) and tall fescue (712.81 kg/da). In mixed grasslands, white clover showed good compatibility both with Kenthucky bluegrass and perennial rye–grass. Better realization of clover plants with a higher dry matter productivity had the variants of legume grass Poa pratensis L. Forage of white clover–Kentucky bluegrass was the richest in proteins (151.6 g kg–1 DM), with the highest dry matter digestibility (712.6 g kg–1 DM) and with the lowest fiber content (NDF–356.5 g kg–1 DM; ADF–226.4 g kg–1 DM and cellulose–192.4 g kg–1 DM) of the cell walls with exception of lignin. Plants of Dactylis glomerata L. dominated with over 75% in the forage of variant with blue hybrid alfalfa–cock’s foot. Soil (pHKCL=4.3) and climate conditions of the region are the reason for the weaker growth of alfalfa grassland and the high degree of variability in terms of its realization, compared to legume grasses in the other variants. The plant grassland had the highest fiber content (346.3 g kg–1 DM), the lowest content of protein (114.9 g kg–1 DM), and the lowest dry matter digestibility (630.7 g kg–1 DM) compared to the other mixtures included in the experiment.
Keyword: Lotus corniculatus, Trifolium repens, Trifolium pratense, Festuca pratensis, Festuca rubra, Lolium perenne, Poa pratensis, Phleum pratense, Dactylis glomerata, Grass mixtures, Productivity and quality of forage.