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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% ).
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Czystosc nasion mieszanek traw gazonowych

75%
The estimation of two grass mixtures growth: at the nitrogen fertilization (120 and 240 kg/ha) and with CaCO₃ (4 t/ha) was applied, was made during 1987-1991 period. One of experiments was performed at Nowa Bystrzyca 630 m elevation a.s.l. and the second one at Spalona on 780 m elevation a.s.l. In both cases soils were brown average class of pH=4, rich in phosphorus and average rich in potassium. On the basis of five years studies we can conclude that on the perennial meadows high give yields species: (Dactylis glomerata L.) and (Poa pratensis L.). Such species as (Festuca pratensis Huds.), (Phleum pratense L.) and (Lolium perenne L.) gave good yields only for first two years after seeding. Strongly competitive species was (Holcus mollis L.), especially in area fertilized with 240 kg N/ha and in mixtures without (Dactylis glomerata L.).
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