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By Harold Keener, Fuqing Xu, Mary Wicks
Land application of livestock manure provides nutrients such as nitrogen, phosphorous and potassium (NPK) to field crops and is generally the most accepted and economical use for recycling these nutrients. However, land application of manure has been a contributor to severe outbreaks of harmful algal blooms in the Western Lake Erie Basin and Grand Lake St. Marys. The algal blooms have generated health concerns for those using these lakes as sources of drinking water or for recreation. Runoff of total and dissolved reactive P (DRP) is often the limiting nutrient for freshwater algal blooms. Previous studies have shown that the concentration of water-extractable P (WEP) in manure (expressed as lb WEP/lb dry matter) can help predict DRP in runoff.  Thus, for a given level of P application per acre, reducing the WEP/P level in manure would reduce total WEP application, thereby reducing the potential for P runoff from land applied manure an ....

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