||Manure harvesting practices : effects on waste characteristics and runoff /
Hansen, Ralph W. ;
Harper, Judson M. ;
Stone, Marvin L. ;
Ward, Gerald M. ;
Kidd., Ricky A.
||Colorado State Univ., Fort Collins.;Robert S. Kerr Environmental Research Lab., Ada, Okla.
|| Environmental Protection Agency, Office of Research and Development, Robert S. Kerr Environmental Research Laboratory ; For sale by the National Technical Information Service,
Animal waste--Research. ;
Agricultural wastes ;
Water pollution abatement ;
Solid waste disposal ;
Beef cattle ;
Waste disposal ;
Industrial waste treatment ;
Materials recovery ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||viii, 104 pages : illustrations, graphs, chart ; 28 cm.
To develop a basis for better manure harvesting management practices a combined field and laboratory study was conducted. The effect of management practices on manure qualities and runoff pollution potential were compared on three feedlot pens with fully surfaced, partially surfaced and unsurfaced conditions. Average N, P and K elements were present in a ratio of approximately 4:1:2 providing 46 lbs N, 11 lbs P and 27 lbs K per ton of dry manure. For recycling purposes ash is an important fraction of manure and can be reduced by use of hard surfaced pens. Ash content averaged 36.2%. Fiber and lignin in manure are directly related to the fiber content of the ration. The effect of decomposition of the manure was greatest on its viscosity and squeezability. Bulk density and particle size remained the same. Surfaced feedlot areas have a larger percentage of precipitation in runoff with higher concentrations of pollutants. Increased animal densities on surfaced pens will offset the difference with non-surfaced pens and can result in a lower peranimal pollution potential from runoff.
Prepared by Colorado State University, Fort Collins, Colo., under grant no. R-803378. Includes bibliographies and appendices. Microfiche.