Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: June 29, 1999
Publication Date: October 1, 1999
Technical Abstract: The potential for P removal from surface-applied manure and subsequent transport into adjacent bodies of water is dependent on land cover, slope, precipitation amounts and intensity, erosion or runoff of sediments or manure, quantity of manure applied and level of incorporation, past history of manure applications, and soil physical and chemical characteristics. This report addresses soil characteristics governing the tendency of manur P to adsorb, desorb, and move. Soil from the Great Plains with varying reactive surfaces were used to establish adsorption isotherms with model P substrates such as inorganic P from fertilizer, calcium phytate (a constituent of grain-P fed to cattle), and also with dried beef and hog manures. Phosphate buffering capacities and movement in spoil columns with different amounts of applied water were established. P release from substrates with time to anion-exchange or resin strips were evaluated. Results of these experiments will be presented, along with their implications for contamination from organic and inorganic P into surface and/or ground waters.