1. Department of Soil Science and Plant Nutrition, Agriculture Faculty of Harran University, Sanliurfa, Turkey
2. Department of Soil Science and Plant Nutrition, Agriculture Faculty of, Malatya Turgut Özal University, Battalgazi, Malatya, Turkey
3. Department of Crop and Soil Sciences, OR State University, Klamath Falls, Oregon, USA
4. Department of Environmental Sciecnes, Emory University, Atlanta, Georgia, USA