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Published in J. Environ. Qual. 33:1062-1069 (2004).
© ASA, CSSA, SSSA
677 S. Segoe Rd., Madison, WI 53711 USA

TECHNICAL REPORTS

Waste Management

Laboratory Characterization of Phosphorus in Fresh and Oven-Dried Organic Amendments

B. Ajiboye, O. O. Akinremi* and G. J. Racz

Department of Soil Science, University of Manitoba, Winnipeg, MB, R3T 2N2 Canada

* Corresponding author (akinremi{at}ms.umanitoba.ca).

Received for publication February 27, 2003. This study was performed to determine the forms of P and to examine the influence of oven-drying on P forms in different organic amendments. Samples of biosolids, beef and dairy cattle manures, and hog manures from sow and nursery barns were used in this study. Both fresh and oven-dried amendments were analyzed for inorganic (Pi), organic (Po), and total phosphorus using a modified Hedley fractionation technique. Water extracted about 10% of total biosolids P and 30 to 40% of total hog and cattle manure P. The amount of P extracted by NaHCO3 ranged from 21 to 32% of total P in all organic amendments except in the dairy cattle manure with 45% of total P. The labile P fraction (sum of H2O- and NaHCO3–extractable P) was 24% of biosolids P, 60% of hog manure P, and 70% of dairy cattle manure P. The residual P was about 10% in biosolids and cattle manures and 5 to 8% in hog manures. Oven-drying caused a transformation in forms of P in the organic amendments. In hog manures, H2O-extractable Po was transformed to Pi, while in the dairy manure NaHCO3–extractable P was converted to H2O-extractable Pi with oven-drying. Therefore, caution should be exercised in using oven-drying for studies that evaluate forms of P in organic amendments. Overall, these results indicate that biosolids P may be less susceptible to loss by water when added to agricultural land.

Abbreviations: BEEF, manure collected from a beef cattle barn • BIO1 and BIO2, biosolids samples • DAIRY, manure from a dairy cattle barn • DRY, oven-dried manure samples • FRESH, thawed manure samples • HOG-NUR, hog manure collected from a nursery barn • HOG-SOW, hog manure collected from a sow barn • OLD-HOG, hog manure collected from an agitated storage lagoon • Pi, inorganic phosphorus • Po, organic phosphorus


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