Submitted to: Soil Science Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 7/1/2007
Publication Date: 11/1/2007
Citation: Casteel, S., Israel, D.W., Crozier, C., Brake, J., Maguire, R. 2007. Broiler Breeder Diets to Reduce Phosphorus: Manure Composition and Corn Response. Soil Science Society of America Annual Meeting: Crop response to manure and biosolids application. Division SO8. Soil Nutrient Management and Soil plant Analysis. Interpretive Summary:
Technical Abstract: Poultry manure is high in total phosphorus (P) and is often land applied at rates above crop P removal. In areas of concentrated poultry production, such applications have increased soil P levels raising environmental concerns. Previous studies have evaluated the effect of modified poultry diets on rates of P excretion. In one particular study, broiler breeders were fed available P rations at standard and reduced rates of non-phytate P (NPP) with and without the addition of phytase. The manures of the standard and the reduced NPP diets were pelletized and subsequently applied to Portsmouth soil to evaluate plant availability. This study examined P availability to corn at rates of 7.5, 15, 30 and 60 mg of total P kg-1 of dry soil for both pelletized manures and triple superphosphate. An untreated control was included to account for soil-supplied P to the corn. Experimental design was a RCBD with four replications where soil was maintained at 50% container capacity (18 % moisture) daily. Weekly height measurements were taken post-emergence for 4 weeks. Leaf area and plant biomass partitioning was measured 4 weeks after emergence. Soil analyses included water soluble P, total P, total inorganic P, Mehlich-3 nutrients, C:N, and pH. Future research will identify varying Ca:P ratio manures and evaluate P transformation related to environmental concerns and bioavailability.