Udzial Lolium perenne w mieszankach nasion a jej wystepowanie w runi pastwisk w roznych warunkach siedliskowych

In studies performed in 1998-2001, yielding and sward species composition of six mixtures performed for pasture with Lolium perenne participation was compared. Studies revealed that species share in pasture fodder achieved was variable both depending on species composition or mixtures sown, soiI conditions and year of performance. Yielding and species composition of six mixtures performed for pasture (BG-5 and BG-6 by Barenburg, Mkb-1 and Mkb-2 by Land O’Lakes as well as P-1 and P-2 by Rolimpex), with special attention paid to Lolium perenne L. share was compared in studies carried out in 1998-2001. Above mixtures were sown onto two pasture quarters of about 1 ha area cach in band design. Particular mixtures covered the area of about 0,165 ha each. Quarters differed with soiI conditions (one localized on mucky-peat, the other on mucky-mineral soil). The share of Lolium perenne cultivars in mixtures sown (1998) ranged from 9,5% (P-2) up to 15,8% (Mkb-2). Sward in studied quarters was performed for grazing in 1999-2001 (4 cuts), except from the first cut in 1999 and 2001. The first cut was harvested in this period because of long-term excessive humidity. The share of Lolium perenne in pasture fodder achieved was variable both depending on species composition of mixtures sown, soil conditions, and year of performance. In 1999, the share of Lolium perenne was higher in the sward of mixtures on mucky-mineral soil. Soil conditions in 2000-2001 did not affect the species share. In the third year of experiment (2001), also great differentiation of Lolium perenne share in the sward depending on mixture type was found. The least share of the species was observed in the sward of P-1 mixture (25,9-31,4% ), the highest in the sward of BG-5 mixture (61,7-62,7% ).