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Broiler Diet Modification and Litter Storage

Impacts on Phosphorus in Litters, Soils, and Runoff

^a Department of Crop and Soil Environmental Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
^b Department of Animal and Food Science, University of Delaware, Newark, DE 19716
^c Department of Soil Science, North Carolina State University, Raleigh, NC 27695
^d Department of Animal and Avian Science, University of Maryland, College Park, MD 20742
^e Smithsonian Tropical Research Unit, Apartado 0843-03092, Balboa, Ancon, Republic of Panama

View larger version (30K): [in a new window]   Fig. 1. Average and standard deviation of broiler litter (a) moisture content (dry weight basis) and (b) temperature at each sample date for broiler litters stored wet and dry from May 2002 to July 2003. Dashed lines indicate the high and low air temperature since the previous sample date.

View larger version (41K): [in a new window]   Fig. 2. Average and standard deviation of water-soluble phosphorus (WSP) concentrations for each diet (NRC, National Research Council; UMD, University of Maryland) in broiler litters stored wet and dry.

View larger version (17K): [in a new window]   Fig. 3. Solution 31P nuclear magnetic resonance (NMR) spectra of NaOH-EDTA extracts of broiler litter after (a) dry and (b) wet storage from May 2002 to July 2003. NRC, National Research Council; UMD, University of Maryland.

View larger version (18K): [in a new window]   Fig. 4. Relationship between [H2O + NaHCO3] inorganic phosphorus (IP) concentrations and orthophosphate P (determined by nuclear magnetic resonance [NMR]) and the relationship between [NaOH + HCl] organic phosphorus (OP) concentrations and phytic acid P (determined by NMR) in stored broiler litter (wet and dry).

View larger version (18K): [in a new window]   Fig. 5. Effect of broiler litter (BL) application at 150 kg P ha–1 on the relationship between soil water-soluble phosphorus (WSP) concentrations and runoff dissolved reactive phosphorus (DRP) concentrations generated by simulated rainfall.