Serdar Bilen
University of Ataturk, Faculty of Agriculture, Department of Soil Science, 25240, Erzurum-Turkey. The Ohio State University, School of Environment and Natural Resources, 1680 Madison Avenue, Wooster, OH 44691, United States. E-mail: sbilen@atauni.edu.tr. Tel: +90 442 231 1646. Fax: +90 442 236 0958.
