Fig. 4. Water-soluble phosphorus (WSP) in unamended control soils and soils amended with selected litters: (a) turkey litters at 5 d, (b) broiler litters at 5 d, (c) turkey litters at 29 d, and (d) broiler litters at 29 d. Means followed by different letters are significantly different at the 0.05 probability level. The legend defines soils amended with litters considered high and low in dietary non-phytate phosphorus (NPP), with and without phytase as defined in Table 1.