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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.
