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Published online 20 April 2005
Published in J Environ Qual 34:970-978 (2005)
DOI: 10.2134/jeq2004.0317
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Phosphorus Extractability of Soils Amended with Stockpiled and Composted Cattle Manure

R. C. Schwartza,* and T. H. Daob

a USDA-ARS, Conservation and Production Research Laboratory, P.O. Drawer 10, Bushland, TX 79012-0010
b USDA-ARS, BARC-East, AMBL, Building 306, Room 102, Beltsville, MD 20705-2350



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  		Fig. 1. Mean extractable P as a function of applied P for the Acuff soil at 8 wk (Incubation II). Error bars are 95% confidence limits of least-squares means for amended soils.

 


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  		Fig. 2. Apparent sorption isotherms of orthophosphate P in KH2PO4–amended soils after 8 wk. Each point represents the mean of three measurements. Lines represent the nonlinear fits to the Langmuir equation. Values in parentheses are NaOAc cation exchange capacity (CEC; cmolc kg–1) for each respective soil series. DRP, dissolved molybdate-reactive phosphorus.

 


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  		Fig. 3. Trends in Mehlich 3–, NaHCO3–, and Texas A&M extractant (TAM)–extractable phosphorus (M3-P, Olsen-P, TAM-P) with water-extractable phosphorus (WP) for different fertilizer sources in the Pullman (Incubation I) and Acuff (Incubation II) soils. Linear regression equations are shown for Ca(H2PO4)2, KH2PO4, and composted manure P sources.

 




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