EN
The paper presents results of 9-year detailed studies on meadow sown with two mixtures and fertilised with mineral fertilisers (6 levels). Three hay cuts were harvested every year. Yields depended on weather conditions during study, species composition of mixture sown and fertilisation levels. Paper also presents special aspect of Sielianinov hydrothermal coefficient highly correlated with yields. Yields of mixtures were calculated according to the formula taking into account permanent arable lands. In general, meadow sown with mixture of great percentage of Arrhenatherum elatius fertilised with nitrogen rate up to 250 kg ha⁻¹ yielded the best. However, it was the species excessively dominating the meadow sward.