EN
The experiment was carried out in 1987 -1992 near Wrocław. The objects of the experiment were three species of grass: cocksfoot grass, tall fescue and meadow timothy. The grasses were utilized three and four times in a season. In effect of sixy ear fertilization and frequent utilization of the green growth the soil got acidified and content of Mg reduced by 50%. Most Mg is cumulated by tall fescue and least by meadow timothy.