EN
A composed experiment made with the split-plot method allowed for the three factors: weed control, species and nitrogen fertilisation. In the years 1993-95, annual yields were determined of UFL, crude protein, PDIN and PDIE. Largest yields of crude protein (1768 kg ha⁻¹), PDIN (1018 kg ha⁻¹), PDIE (927 kg ha⁻¹) and UFL (6979 kg ha⁻¹) were obtained from a sward sod - seeding with Dactylis glomerata, at highest level of fertilisation. Application of a herbicide lowered the energy value of the yields on experimental treatments seeded with Dactylis glomerata, Festuca pratensis and Trifolium pratense.