Abstract. Under the agro ecological conditions of Troyan varieties Bright, Georgia 1, Nueltin, Witt, Pardee, Roseau, Steadfast, Trevig of birds foot trefoil were examined on following indices: dry mass yield, plant height, and morphological composition of sward. The introduced varieties Nueltin (9.0 t/ha -1 ), Pardee (18.2 t/ha -1 ), Roseau (12.8 t/ha -1 ) had the highest dry mass yield in the first, second and third years of the test period. The highest stem per plant was the second year and varieties Bright (47.9 cm) and Nueltin (47.6 cm) were the highest. The highest average leafiness have varieties in the first year of the test period, when it reached 51.2%. The stems prevalent in grass composition in the second year, and generative organs were low during the three years of study. These average results for the period indicate that varieties Witt and Georgia 1 could be success fully cultivated in the agro ecological conditions of Troyan.