Fig. 2. Percentage of the total phosphorus extracted by deionized water (H₂O-P), 0.5 M NaHCO₃ (pH 8.5, NaHCO₃–P), 0.1 M NaOH (NaOH-P), and 1 M HCl (HCl-P) and the residual P fraction in pig manure as influenced by diet manipulation. BMP, barley–micronized pea; BMPE, barley–micronized pea with enzyme; BRP, barley–raw pea; BRPE, barley–raw pea with enzyme.