1. Institute of Hydrology, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava , Slovakia
2. Soil Science Department, Faculty of Agriculture, Menoufia University, Shebin El-Kom , Egypt
3. Polish Academy of Sciences, Institute of Agrophysics, ul. Doswiadczalna 4, P.O. Box 201 20-290, Lublin , Poland
4. Soil Science and Conservation Institute, Rožňavská 23, 831 04 Bratislava , Slovakia