Use of Filters in Drainage Control Structures to Reduce the Risk Associated with Manure Application on Tile-Drained Fields

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In livestock producing areas, animal manure is often applied to cropland to enhance soil fertility. Guidelines have been developed for manure application on fields underlain by subsurface (tile) drainage systems. Some of these guidelines, such as avoiding manure application if rain is predicted and not applying manure over a flowing tile, though effective, involve some level of risk.…