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By Harold Keener, Fuqing Xu, Mary Wicks In our February article (https://ocj.com/2021/02/98547/), we discussed how manure storage conditions can affect water soluble phosphorus, a contributor to algal blooms. This month we look at levels of nitrogen (N), phosphorus (P), and potassium (K) in stored manure. NPK levels in livestock manures Researchers evaluated NPK levels in stored manure using 2018-2019 data provided by a commercial laboratory. The data consisted of analyses of 55 dairy (milking), 397 poultry (layers) and 501 swine manure samples. Farm names and manure management details were not provided. However, 219 of the swine manure samples, which were provided from 91 contract farms using the same feed formulations and deep pit storage, were evaluated separately for comparison. The data was evaluated on a dry basis for comparison purposes as moisture content affects nutrient levels, with high moisture manure being subject to large errors when converted to a dry ....
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 ....