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Nitrogen and Phosphorus Availability in Composted and Uncomposted Poultry Litter

^a Hood College and University of Maryland, 8020 Greenmead Drive, College Park, MD 20740-4000
^b U.S. Department of Agriculture, Agricultural Research Service, National Center for Cool and Cold Water Aquaculture, Kearneysville, WV 25430
^c U.S. Department of Agriculture, Agricultural Research Service, Animal Manure and By-Products Laboratory, Beltsville, MD 20705-2350
^d U.S. Department of Agriculture, Agricultural Research Service, Appalachian Fruit Research Station, 45 Wiltshire Road, Kearneysville, WV 25430

View larger version (22K): [in a new window]   Fig. 1. Nitrate (bottom) and ammonium (top) extracted from sandy loam and treatment mixtures of fresh and composted litter from two sources. Within each sampling day, means with the same letter do not differ at P 0.05.

View larger version (23K): [in a new window]   Fig. 2. Nitrate (bottom) and ammonium (top) extracted from silt loam and treatment mixtures of fresh and composted litter from two sources. Within each sampling day, means with the same letter do not differ at P 0.05.

View larger version (24K): [in a new window]   Fig. 3. Mehlich 1–extractable (bottom) and water-extractable (top) phosphorus extracted from sandy loam and treatment mixtures of fresh and composted litter from two sources. Within each sampling day, means with the same letter do not differ at P 0.05.

View larger version (23K): [in a new window]   Fig. 4. Mehlich 1–extractable (bottom) and water-extractable (top) phosphorus extracted from silt loam and treatment mixtures of fresh and composted litter from two sources. Within each sampling day, means with the same letter do not differ at P 0.05.