Manure Management at Ohio Confined Animal Feeding Facilities in the Maumee River Watershed

In 2015, 48 permitted Confined Animal Feeding Operations (CAFOs) housed approximately 90% of poultry and 20% of swine and cattle within the Ohio portion of the Maumee River watershed. Recently, concerns about the impact CAFOs may have on nutrient loading in the watershed have been raised. In this study, we used manure management plans and inspection reports obtained from the Ohio Department of Agriculture Division of Livestock Environmental Permitting (ODA-DLEP) to assess how these CAFOs managed their manure for the years 2014 and 2015. A majority of liquid manure was applied between April and October, closely matching the amount of liquid manure planned to be applied during this period. Approximately 79% of the acres under control of the CAFOs that received manure had Bray P1 soil test phosphorus values below 50 ppm. The average distance between a swine CAFO's livestock holding barn to the fields they control that can receive manure was 1.43 miles while for cattle CAFOs this distance was 1.91 miles. Approximately 78% of manure phosphorus generated on CAFOs was planned to be transferred through Distribution and Utilization, a process in which ownership of manure changes hands, including virtually all solid poultry manure phosphorus. While publicly available data show that, in general, CAFOs in the region are adhering to their state-approved permits, a knowledge gap regarding the management of approximately 80% of manure phosphorus exists due to manure transferred through Distribution and Utilization and manure produced from non-permitted livestock operations.