1. Faculty of Engineering and Natural Sciences, Sabanci University, 34956 Istanbul, Turkey
2. Anatolian Agricultural Research Institute, Eskisehir, Turkey
3. BD International Agricultural Research Institute, P.O. Box 125, Konya, Turkey
4. Department of Soil Science, Faculty of Agriculture, Cukurova University, Adana, Turkey
5. Karamanoglu Mehmetbey University, 70100, Karaman, Turkey
6. Institute for Plant Nutrition, Leibniz University Hannover, 30419 Hannover, Germany