1. Department of Horticulture, The University of Ondokuz Mayıs, Samsun, Turkey
2. Department of Plant and Animal Production, The University of Ege, İzmir, Turkey
3. Department of Agricultural Economics, The University of Ondokuz Mayıs, Samsun, Turkey
4. Department of Soil Science and Plant Nutrition, The University of Ondokuz Mayıs, Samsun, Turkey