Tuesday, 8 November 2005
5

This presentation is part of: Characterization and Environmental Impacts of Phosphorus

Managing Poultry Litter Application to Control Sub-Surface Losses of Phosphorus from a Coastal Plain Soil.

Arthur Allen, Rory Maguire, Peter J. Kleinman, Andrew Sharpley, and J. T. Sims.

Large surpluses of phosphorus (P) are common in areas of intensive animal production, and are often associated with the accumulation of P to excessive levels in soils and subsequent P losses to surface waters by erosion and surface or subsurface runoff. Recently, sub-surface transport of P from agricultural soils to ground water is of particular concern in coastal plain agro-ecosystems due to high accumulations of dissolved reactive P in surface and sub-surface soil horizons due to long term poultry litter use. This project evaluated the effect of manure management strategies on P leaching from field plots. Plots were amended with poultry litter at three rates: N-based; P-based; no litter. Leachate P concentrations obtained from piezometers at 30 and 60 cm depths ranged widely, with maximum concentrations greater than 10 mg/L in plots receiving N-based litter applications. Results highlight the critical role of manure management in controlling sub-surface P transport.


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