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Influence of Flooding on Phosphorus Mobility in Manure-Impacted Soil

^a University of Florida, Soil and Water Science Department, Institute of Food and Agricultural Sciences, P.O. Box 110510, Gainesville, FL 32611-0510
^b The South Florida Water Management District, Lake Okeechobee Division, 3301 Gun Club Road, West Palm Beach, FL 33406

View larger version (33K): [in a new window]   Fig. 1. The Okeechobee Drainage Basin, Florida, showing a schematic diagram of the proposed stormwater treatment area (STA). Station 1, sampling station in Nubbin Slough, which runs along various dairies in the area; Station 2, runoff sampling station within the STA (in abandoned–intensive area). The percentages indicate the areas under the proposed STA currently occupied by the different components. Numbers in brackets [ ] indicate number of sampled locations in each component.

View larger version (19K): [in a new window]   Fig. 2. Phosphorus concentrations measured over a decade in water samples collected at Station 1 (Nubbin Slough) and Station 2 (runoff from the proposed stormwater treatment area [STA]). The term n is the number of data points used to calculate the mean, and error bars represent ± standard error of the means.

View larger version (35K): [in a new window]   Fig. 3. Phosphorus sorption capacities (estimated based on single point isotherm; initial added P = 1000 mg P kg-1) of A-, E-, and Bh-horizon soils of variously managed dairy components. Error bars represent ± standard error of the means.

View larger version (16K): [in a new window]   Fig. 4. Phosphorus released from active– and abandoned–intensive areas soils in a single 1-h water extraction under aerobic and anaerobic conditions. Error bars represent ± standard error of the means.

View larger version (14K): [in a new window]   Fig. 5. Net P release from active– and abandoned–intensive area soils after six consecutive 1-h water extractions under aerobic conditions. Error bars represent ± standard deviations.