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Phosphorus and Ammonium Concentrations in Surface Runoff from Grasslands Fertilized with Broiler Litter

^a Dep. of Crop and Soil Environmental Sciences, Virginia Polytechnic and State Univ., Blacksburg, VA 24061
^b Dep. of Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30602
^c Animal and Dairy Sciences, Univ. of Georgia, Athens, GA 30602

View larger version (24K): [in a new window]   Fig. 1. Average runoff volume and flow-weighted NH+4–N and DRP concentrations in individual runoff events from grasslands fertilized with broiler litter (down arrows indicate broiler litter applications; up arrows indicate N fertilizer applications; error bars indicate standard deviations based on six paddocks).

View larger version (52K): [in a new window]   Fig. 2. Flow-weighted concentration of DRP as a function of natural logarithm of days after litter application and natural logarithm of runoff volume.

View larger version (14K): [in a new window]   Fig. 3. Observed versus fitted DRP concentration in runoff. The diagonal line corresponds to a 1:1 relationship. The fitted model for DRP consisted of linear regression terms for ln DAA, ln RUNOFF, and the interaction between both variables.

View larger version (27K): [in a new window]   Fig. 4. Soil test P (Mehlich 1; 0- to 15-cm line) and flow-weighted concentration of DRP (bars) between soil samplings (error bars indicate standard deviation; down arrows indicate broiler litter applications).