EN
The long terra experiment in Czarny Potok valley was set up in 1968 on the mountain meadow. The effect of two rates and two forms of nitrogen against a background of phosphorus and potassium fertilization cn yielding, chemical composition of plants and soil properties was investigated. During 25 years of the experiment the following quantities of the elements were taken away with the crops from the particular objects (without liming): from 1140 to 3874 kg K, from 365 to 714 kg Ca, from 140 to 367 kg Mg and from 23 to 67 kg Na/ha. In 1992 the content of basic exchangeable cations in the soil was investigated (1 M ammonium acetate with pH=7,0). This content decreased together with the depth. The lowest differences in cation content in the soil profile showed magnesium. The highest differences between objects occurred for the content of exchangeable calcium in the 0-10 cm horizon. The calcium content in the soil from the objects fertilized with the double dose of nitrogen was over two times lower than from the control object. The long-term (7 years) effect of liming on increase in the calcium cation content in the soil profile was observed.