Department of Soil Science and Agrochemistry,Szent Istvan University ,2100 Godollo,Hungary E-mail:micheli@fau.gau.hu;
Department of Colloid Chemistry,University of Szeged,6720 Szeged,Hungary;
Department of Soil Science and Agrochemistry,Szent Istvan University ,2100 Godollo,Hungary E-mail:micheli@fau.gau.hu;
Department of Soil Science and Agrochemistry,Szent Istvan University ,2100 Godollo,Hungary E-mail:micheli@fau.gau.hu;