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On the Cover: Min Liu, a third-year doctoral student with the soil and water science department, takes soil samples from an experimental plot of St. Augustinegrass. Liu will test the samples for their phosphorus content. He is determining the minimum amount of phosphorus that soil must contain to support healthy St. Augustinegrass, and how much fertilizer must be added to soil to provide the needed phosphorus. See Liu et al., page 1178. (AP photo/University of Florida/IFAS/Josh Wickham)