Formation of exchangeable cation content in loess soil depending on the land use and mineral fertilization

Studies of the content of exchangeable cations were carried out in 1986-1993 in Rzeszów Submountain„region. The following land uses were considered: forest virgin soil, arable soil - productive field and experimental field. In two fertilization experiments varried NPK+Mg and NPK+Mg+Ca fertilization was applied with plant cultivation in the cropping system (static fertilization field). The experiment was carried out on the clay, very acid grey-brown podzolic soil. It was found that after 8 years of research the exchangeable Ca, K and Na content was the lowest in the Ah/Eet and Bt horizons of forest soil, but the exchangeable Mg content was the highest. In the experimental field the highest content of exchangeable Ca was in the Ap and Bt horizon of limed soil, exchangeable Mg in Ap and Bt horizon of limed soil and non-limed one. The content of exchangeable K was very differentiated. The highest content of exchangeable Na was in Ap horizon of limed soil.