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Fig. 3. Linear combination fit results for normal corn (NORC) broiler litter (top row), high available phosphorus corn (HAPC) broiler litter (middle row), and turkey manure (bottom row) samples. The original spectra are shown with a solid line (–), total fit is represented with open circles ({circ}), dicalcium phosphate is represented with a dashed line (- - -), phytic acid is represented with a dotted line (• • •), aqueous phosphate is represented by open triangles ({triangleup}), and hydroxylapatite is represented with a plus (+). Of special interest is the appearance of hydroxylapatite in the HAPC–0.2% non-phytate phosphorus (NPP)+ phytase sample (middle row) and in the P deficient as well as P deficient plus phytase turkey samples (bottom row). The presence of this species can be explained by differences in the Ca to P ratios of these manure samples.