Poultry manure is high in total P and is often land applied at rates above crop P removal. Such applications and concentrated areas of poultry production have increased soil P levels, which raise environmental concerns. Previous studies have evaluated modifying poultry diet to reduce P excretion. A broiler-breeder diet study examined a standard and a reduced available P rate via non-phytate P (NPP) ration alone and a reduced NPP ration amended with phytase. The four resulting manures were collected and pelletized for soil mineralization and crop response studies. This study examines the P mineralization rate of the four manures at 30 and 60 mg of total P/kg of dry soil in two low P soils. Portsmouth fine sandy loam was collected from a long term fertility study in Plymouth NC, and Wagram loamy sand was collected in a forested area at Clayton NC. An untreated control was included to account for endogenous P mineralization of the respective soils. Experimental design was a RCBD with three replications. Soil was maintained at 60% container capacity (16% moisture) and 25°C for 12 weeks.  Subsamples were taken at week 0, 1, 2, 4, 8 and 12, and were analyzed for water soluble P, total P, total inorganic P, Mehlich-3 nutrients, C:N, and pH.