EN
In the years (1989 -1991) the geassland experiment on the peat - muck soil near Miedwie Lake were carried out in which the influence of Caraway common (Carum carvi) and its diferent participations (0, 5,10, 20, 30%) in grass mixture with fertilization appiled N (0, 80,160, 240, 320 kg ha-1) and constant P120 po K150 on magnesium content has been tested. The researches showed that meadow sward on the peat - muck soil with paricipations of Carum carvi, contain more magnesium (0,36 - 0,71% of dry matter) than feed- ding standard determined. Increasing nitrogen doses decreased the magnesium content in sward.