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Phosphorus Runoff Relationships for Louisiana Coastal Plain Soils Amended with Poultry Litter

^a Dep. of Agronomy, Louisiana State Univ. AgCenter, Baton Rouge, LA 70803
^b Dep. of Biological and Agric. Eng., Louisiana State Univ. AgCenter, Baton Rouge, LA 70803
^c USDA-ARS National Soil Tilth Lab., Ames, IA 50011

View larger version (25K): [in a new window]   Fig. 1. Relationships of volume-averaged concentrations of dissolved P (DP) in plot runoff from the four study sites with (a) total, (b) Bray 1, (c) Bray 2, and (d) Mehlich 3 P in surface 0 to 5 cm soil (n = 11).

View larger version (20K): [in a new window]   Fig. 2. Relationships of volume-averaged concentrations of dissolved P (DP) in plot runoff from the four study sites with (a) resin-exchangeable and (b) water-extractable P in surface 0 to 5 cm soil (n = 11).

View larger version (14K): [in a new window]   Fig. 3. Dissolved P (DP) concentrations (filled circles) in short column effluent for soil collected at Plot 1, Site 3 before the December 1999 rainfall simulation. Average DP concentration was approximated as area under the curve divided by effluent depth equal to depth of simulated rainfall.

View larger version (18K): [in a new window]   Fig. 4. Relationship of volume-averaged concentrations of dissolved P (DP) in plot runoff from the four study sites with volume-averaged concentrations of DP in effluent from short columns of 0 to 5 cm soil (n = 11). A 1:1 line (dashed) is also shown.