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Impact of Alum-Treated Poultry Litter Applications on Fescue Production and Soil Phosphorus Fractions

^a Eastern Shore Agricultural Research and Extension Center, Virginia Polytechnic Institute and State Univ., 33446 Research Dr., Painter, VA 23420
^b Dep. of Agronomy and Horticulture, New Mexico State Univ., Room 127N, Skeen Hall, P.O. Box 30003, Las Cruces, NM 88003-8003
^c Dep. of Crop and Soil Environmental Sciences, Virginia Polytechnic and State Univ., 330 Smyth Hall, Blacksburg, VA 24061

View larger version (26K): [in a new window]   Fig. 1. The summed concentrations of inorganic P extracted using deionized H2O (H2O-Pi), 0.5 M NaHCO3 (NaHCO3–Pi), 0.1 M NaOH (NaOH-Pi), and organic P extracted using 0.1 M NaOH (NaOH-Po) in relation to ammonium oxalate extractable P(AMOX-P) measured in soils collected in the spring 2004 (**, p value < 0.001).

View larger version (26K): [in a new window]   Fig. 2. The concentrations of deionized H2O extractable Pi (H2O-Pi), 0.5 M NaHCO3 extractable Pi (HCO3–Pi), and H2O-Pi plus HCO3–Pi as a function of Mehlich-1 extractable P (M1-P) (** p value < 0.001).