EN
In a field experiment two grass species Dactylis glom erata and Bromus unioloides were cultivated. They wen fertilized with inreasing doses of nitrogen and potassium After three and five years soil samples were collected to determine Mg, Mn, Zn and Cu. The decrease of soil pH as well as available Mg was found. The level of available contents of Mn and Cu in soil were low whereas conten of Zn was medium or high. As far as fertilizer rates in creased the content of Mn and Zn increased, too. On the contrary content of Cu was lover.