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Associated Release of Magnesium and Phosphorus from Active and Abandoned Dairy Soils

M. S. Josan, V. D. Nair*, W. G. Harris and D. Herrera

Soil and Water Science Department, 106 Newell Hall, P.O. Box 110510, University of Florida, Institute of Food and Agricultural Sciences, Gainesville, FL 32611-0510



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  		Fig. 1. Changes in electrical conductivity (EC) (dS m–1) with repeated water extractions. AD, active dairy manure–impacted soil; AB, abandoned dairy manure–impacted soil; MI, minimally impacted soil.

 


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  		Fig. 2. Changes in Ca concentrations (mg kg–1) with repeated water extractions. AD, active dairy manure–impacted soil; AB, abandoned dairy manure–impacted soil; MI, minimally impacted soil.

 


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  		Fig. 3. Changes in Mg concentrations (mg kg–1) with repeated water extractions. AD, active dairy manure–impacted soil; AB, abandoned dairy manure–impacted soil; MI, minimally impacted soil.

 


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  		Fig. 4. Changes in soluble reactive phosphorus (SRP) concentrations (mg kg–1) with repeated water extractions. AD, active dairy manure–impacted soil; AB, abandoned dairy manure–impacted soil; MI, minimally impacted soil.

 


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  		Fig. 5. Relationship between soluble reactive phosphorus (SRP) and Mg and Ca for active dairy manure–impacted soils released during repeated water extractions.

 


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  		Fig. 6. Relationship between soluble reactive phosphorus (SRP) and Mg and Ca for abandoned dairy manure–impacted soils released during repeated water extractions.

 




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