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-P_i and H₂O-P_o are water-extractable inorganic and organic phosphorus, NaHCO₃–P_i and NaHCO₃–P_o are NaHCO₃–extractable inorganic and organic phosphorus, NaOH-P_i and NaOH-P_o are NaOH-extractable inorganic and organic phosphorus; and HCl-P is HCl-extractable phosphorus.