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Paul R. Fisher, William R. Argo, and John A. Biernbaum

, Marysville, OH)] ranged from 5.1 with Saintpaulia ionantha Wendl. (African violets) to 6.5 with Gerbera jamesonii Bolus ex Hook. (gerbera). In addition, WSF concentration also influenced substrate pH. For example, the substrate pH of gerbera decreased