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Published online 2 February 2006
Published in J Environ Qual 35:529-541 (2006)
DOI: 10.2134/jeq2005.0139
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Phosphorus Release from a Manure-Impacted Spodosol: Effects of a Water Treatment Residual

M. L. Silveira*, M. K. Miyittah and G. A. O'Connor

Soil and Water Science Department, University of Florida, Gainesville, FL 32611-0510


Figure 1
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  		Fig. 1. Phosphorus release kinetics from (A) native and (B) manure-impacted surface soils (note scale differences).

 

Figure 2
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  		Fig. 2. Water-extractable P released from different soil mixes with repeated extractions. S1 = 100% impacted A horizon; S2 = 50% impacted A horizon, 50% E horizon; S3 = 33% impacted A horizon, 66% E horizon.

 

Figure 3
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  		Fig. 3. Measured and calculated P release from soil mixes. S1 = 100% impacted A horizon; S2 = 50% impacted A horizon, 50% E horizon; S3 = 33% impacted A horizon, 66% E horizon.

 

Figure 4
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  		Fig. 4. Phosphorus concentration as a function of Ca and Mg concentrations measured in 1/10 (w/v) water extracts (10 repeated water extractions).

 

Figure 5
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  		Fig. 5. Phosphorus concentration in leachates of control and samples treated with water treatment residue (WTR) (fully incorporated with the soil mass [100%] and mixed with half of the soil mass [50%]). S1 = 100% impacted A horizon; S2 = 50% impacted A horizon, 50% E horizon; S3 = 33% impacted A horizon, 66% E horizon.

 

Figure 6
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  		Fig. 6. Phosphorus relative distribution among the various soil fractions. Initial and final = samples before and after the leaching trial, respectively. S1 = 100% impacted A horizon. WTR(50%) = water treatment residue mixed with half (7.5 cm) of the soil column, and WTR(100%) = WTR fully incorporated (15 cm) into the entire soil column.

 




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