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Phosphorus Release from a Biosolids-Amended Sandy Spodosol

Soil and Water Science Dep., P.O. Box 110510, Univ. of Florida, Gainesville, FL 32611-0510

View larger version (13K): [in this window] [in a new window]   Fig. 1. Dynamic laboratory incubation. Cumulative P released (% of applied P) as a function of biosolids–percent water-extractable P (PWEP). P-rate: 224 kg P ha–1. Error bars represent 1 SE. Vertical line at biosolids-PWEP = 14% indicates when increased negative environmental impact may occur.

View larger version (8K): [in this window] [in a new window]   Fig. 2. Dynamic laboratory incubation. Cumulative P released as a function of phosphorus saturation index (PSI) showing a change point at PSI 2.0. P-rate: 224 kg P ha–1. Dashed vertical line at 1.1 PSI represents change point proposed by Elliott et al. (2002). Solid vertical line at 2.0 PSI represents increased critical PSI value suggested by data in the current study.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Dynamic laboratory incubation. Cumulative P released (% of applied P) per leaching event. P-pate: 224 kg P ha–1.