Productive effects and potassium and magnesium cycling in relation to the ways of fertilisation of permanent meadow on peat-muck soil were tested in field experiment in the years 2006-2009. Due to progressing soil mineralization and nitrogen release, fertilisation with only phosphorus and potassium (P-30 and K-60 kg·ha-1) was applied at the first level of fertilisation. Complete fertilisation (P-30, K-60 and N-60 kg ha-1) was also applied at this level. Fertilisation at the second level included P-45, K-90 and N-90 kg·ha-1. Apart from mineral fertilisation, two levels of manure and liquid manure fertilisation were applied considering the content of particular nutrients and equivalents of their utilisation. Phosphorus deficits were supplemented with mineral forms of the element. Potassium was introduced with fertilisers in large amounts and organic fertilisers contained substantial amounts of magnesium - from 27 to 41 kg ha-1 delivered in manure and from 6 to 9 kg ha-1 in liquid manure. Peat-muck soil gave relatively large yields exceeding 6 t ha-1 of dry mass from PK variant. Complete NPK fertilisation, irrespective of the form, did not always increase the yields. Organic fertilisation usually increased the content of potassium in meadow sward. Despite high magnesium input with fertilisers, the content of this element did not always increase in meadow sward.