Problem A 1 1/2 acre farm pond located in southeastern Wisconsin was experiencing a severe algae bloom due to high levels of fertilizer runo from the surrounding farm elds located on the north and east sides of the pond. Farm eld runo drains into the north end of the pond via a 4-inch drainpipe. The pond is further fertilized by the year round population of 6-8 resident ducks and by migrating waterfowl in the spring and fall of the year. The pond was created by placing an earthen dam in the gully of the surrounding farm elds. Average water depth is 4-5 feet deep with an 18-foot hole located in the center of the lake. The periphery of the pond averages only 18 to 24 inches in depth for the rst 6-10 feet from the shoreline, thus contributing to algae problems. The pond also has a small

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