EN
The aim of the studies carried out in the years 1986-1998 was determination of habitat factors, which are favourable for Lolium perenne persistency on peat-muck soils. The investigations were conducted in three experiments established on meadows and pastures. Two of them were set up after conventional tillage, another one by direct reseeding of seed mixtures in the old sward with special seeders. Lolium perenne was one of the mixture components. Content of that species in the mixture depended on kind of experiment and ranged 15-50%. There was confirmed that perennial ryegrass can be useful to grass communities on moderately moist peat-muck soils, especially for pasture use. Regeneration of that species after frost killing was faster under pasture utilization. Favourable thermal conditions at winter and moderate moisture of soil, preceding winter period, and also adequate method of grassland reseeding are the factors affecting good persistency of Lolium perenne in the sward on peat-muck soils. To avoid perennial ryegrass domination in the sward in sowing year content that species in the mixture should not exceed 20%.