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Published online 9 August 2005
Published in J Environ Qual 34:1682-1686 (2005)
DOI: 10.2134/jeq2004.0373
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Amendment Effects on Soil Test Phosphorus

D. Brauera,*, G. E. Aikenb, D. H. Potea, S. J. Livingstonc, L. D. Nortonc, T. R. Wayd and J. H. Edwards{dagger}

a USDA-ARS, Dale Bumpers Small Farms Research Center, Booneville, AR 72927
b USDA-ARS, Forage-Animal Production Research Unit, Lexington, KY 40506
c USDA-ARS, National Soil Erosion Lab., West Lafayette, IN 47907-1196
d USDA-ARS, National Soil Dynamics Lab., Auburn, AL 36832-5806



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  		Fig. 1. Effects of soil amendment treatments on Bray-1 P levels. Data are averages across depths, years and replications. Bars represent SE. Treatment legend is in figure.

 


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  		Fig. 2. Effects of soil amendment treatments on dissolved reactive P (DRP) levels. Data are averages across depths, years, and replications. Bars represent SE. Treatment legend is in figure.

 


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  		Fig. 3. Changes in soil dissolved reactive P (DRP) levels with time for the 5.0 Mg gypsum ha–1 soil amendment treatment (closed symbols) and unamended control (open symbols). SE are presented as bars.

 


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  		Fig. 4. Water-soluble Ca levels in soil samples from the 0-7.5 cm depth in 1999 (open bars) and 2001 (solid bars). Data from soils receiving 1.5 Mg and 5.0 Mg gypsum ha–1 are presented along with those from control plots. SE are presented as bars.

 




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