Confined Animal Production and Manure Nutrients

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英文名称：

Confined Animal Production and Manure Nutrients

作者：

Noel Gollehon; Margriet Caswell; Marc Ribaudo; Robert Kellogg; Charles L; er; David Letson

工作单位：

USDA's Economic Research Service

来源地址：

https://www.ers.usda.gov/publications/pub-details/?pubid=42412

关键词：

Manure;  nutrients;  manure nutrients;  animal waste;  confined livestock;  confined animal feeding operation;  CAFO;  feedlot beef;  dairy cows;  swine;  poultry;  animal unit;  manure nitrogen;  manure phosphorus;  water quality; 

年份：

2001

出版地：

Washington, DC, USA

总页数：

39 pp

语种：

English

摘要：

Census of agriculture data were used to estimate manure nutrient production and the capacity of cropland and pastureland to assimilate nutrients. Most farms (78 percent for nitrogen and 69 percent for phosphorus) have adequate land on which it is physically feasible to apply the manure produced onfarm at agronomic rates. (The costs of applying manure at these rates have not been assessed). Even so, manure that is produced on operations that cannot fully apply it to their own land at agronomic rates accounts for 60 percent of the Nation's manure nitrogen and 70 percent of the manure phosphorus. In these cases, most counties with farms that produce ""excess"" nutrients have adequate crop acres not associated with animal operations, but within the county, on which it is feasible to spread the manure at agronomic rates. However, barriers to moving manure to other farms need to be studied. About 20 percent of the Nation's onfarm excess manure nitrogen is produced in counties that have insufficient cropland for its application at agronomic rates (23 percent for phosphorus). For areas without adequate land, alternatives to local land application--such as energy production--will need to be developed.