Investigations comprised two stands of Ass. Danthonietum calycinae on Mount. Kopaonik at 1150 and 1200 m. alt. In those stands, weight share of medicinal plants was monitored in the structure of grassland yields: in 1^st one (location Plekovište) under conditions of treatment with different amounts of fertilisers (1. Control, 2. PK, 3. NPK, 4. stable manure) and in 2^nd one (location Ilinac) at applying identical amounts of fertilisers (N₁₄₀P₆₀K₆₀) and at different systems of utilisation i.e. by grazing (continuous and rotational) and cutting. The results were compared with a control variant i.e. without fertiliser application. Investigations were carried out during 1989-1991 at the first location and during 1991-1993 at the second one.

The results indicate that the share of medicinal plant species varies, depending on different fertiliser treatments and manner of utilisation as well as per year. The lowest share of these species was found when NPK fertilisers were applied (1.8-3.9%) and the highest on a control plot of the second location (18.0-64.3%), primarily due to a high share of the species Athyllis vulneraria. The share of these species was higher in rotational than in continuous grazing and cutting.