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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



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  		Fig. 1. Flowchart of the sequential extraction procedure. The terms H2O-P, NaHCO3–P, NaOH-P, and HCl-P represent phosphorus that was extracted by deionized H2O, 0.5 M NaHCO3, 0.1 M NaOH, and 1 M HCl, respectively. Residual P was the phosphorus that could not be extracted by the above extractants.

 


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  		Fig. 2. Phosphorus fractions in fresh and oven-dried amendments. (a) Phosphorus extracted by deionized H2O, (b) P extracted by 0.5 M NaHCO3 (pH 8.5), (c) P extracted by 0.1 M NaOH, (d) P extracted by 1 M HCl, and (e) residual P. **Significant at the 0.01 probability level. ***Significant at 0.01 probability level. The whiskers represent standard errors of the means of three replicates. BEEF, manure collected from beef cattle barn; BIO1 and BIO2, biosolids samples; DAIRY, manure from dairy cattle barn; 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.

 


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  		Fig. 3. Cumulative P fractions extracted in various amendments. BEEF, manure collected from beef cattle barn; BIO1 and BIO2, biosolids samples; DAIRY, manure from dairy cattle barn; 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.

 


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  		Fig. 4. Transformation of P fractions with oven-drying of the amendments. (a) Hog manure collected from an agitated storage lagoon (OLD-HOG), (b) hog manure from a sow barn (HOG-SOW), (c) hog manure from a nursery barn (HOG-NUR), and (d) manure from a dairy barn (DAIRY). The whiskers represent standard errors of the means of three replicates. The terms H2O-Pi and H2O-Po are water-extractable inorganic and organic phosphorus, NaHCO3–Pi and NaHCO3–Po are NaHCO3–extractable inorganic and organic phosphorus, NaOH-Pi and NaOH-Po are NaOH-extractable inorganic and organic phosphorus; and HCl-P is HCl-extractable phosphorus.

 




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