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Rainfall Timing and Poultry Litter Application Rate Effects on Phosphorus Loss in Surface Runoff

^a USDA-ARS, National Soil Tilth Laboratory, Ames, IA 50011
^b University of Georgia, Department of Crop and Soil Sciences, Athens, GA 30602

View larger version (20K): [in a new window]   Fig. 1. Typical plot showing runoff dissolved reactive phosphorus (DRP) concentration (mg L–1) as predicted with Eq. [4], for 2 (solid line), 7 (long dash), and 14 (short dash) Mg ha–1 litter applications and observed P in runoff for 2 (•), 7 (), and 14 () Mg ha–1 litter applications to 1- x 2-m plots.

View larger version (26K): [in a new window]   Fig. 2. The relationship between observed and simulated dissolved reactive phosphorus (DRP) concentration (mg L–1) for Eq. [4] (•), [6] (), [12] (), and [14] (). The solid line represents a 1:1 relationship.

View larger version (34K): [in a new window]   Fig. 3. Dissolved reactive phosphorus (DRP) concentration (mg L–1) observed and simulated for runoff events in 1995. Arrows indicate the approximate dates when poultry litter was applied. The terms TP and WSP refer to total and water-soluble phosphorus content of litter, respectively, and t is the number of days since litter application.

View larger version (37K): [in a new window]   Fig. 4. Dissolved reactive phosphorus (DRP) concentration (mg L–1) observed and simulated for runoff events in 1996. Arrows indicate the approximate dates when poultry litter was applied. The terms TP and WSP refer to total and water-soluble phosphorus content of litter, respectively, and t is the number of days since litter application.