1. Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, OK 74078, USA
2. Scott’s Miracle-Gro Company, Marysville, OH 43040, USA
3. Department of Horticultural Science, Faculty of Agriculture, Shiraz University, Shiraz, Fars, Iran
4. Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078, USA