Estimated manure N and P contents are from Ruddy et al. Sources: The number of animals per state are from USDA’s 2007 Census. StateĮstimated animal manure per farm land area (kg of N/km 2)Įstimated animal manure per farm land area (kg of P/km 2) Data are presented as 1000s of kg of manure nitrogen and phosphorus as well as kilograms of manure nitrogen and phosphorus per km 2 of farmland.Įstimated nitrogen (N) and phosphorus (P) produced from animal manure in 2007. Data are for cattle, swine, poultry (chickens and turkeys), sheep, and horses. This indicator shows animal agriculture manure produced in states in 2007 (the year of the last Census of Agriculture) and expressed in terms of nitrogen and phosphorus content, rather than total amounts of manure, since different animal types produce manure with differing nitrogen and phosphorus concentrations. Permitting discharging CAFOs to limit nitrogen and phosphorus discharge to surface waters, and implementing best management practices outlined in a manure management plan are critical steps to protecting water quality. Manure runoff from cropland and pastures or discharging animal feeding operations and concentrated animal feeding operations (CAFOs) often reaches surface and groundwater systems through surface runoff or infiltration. Limiting loads (Status of Nutrient Requirements for NPDES-Permitted Facilities)Īnimal agriculture manure is a primary source of nitrogen and phosphorus to surface and groundwater.
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