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Cropping System Effect on Soluble and Sediment-Bound Phosphorus Losses
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 032076, 2003 ASAE Annual Meeting . (doi: 10.13031/2013.14942) @2003
Authors: Joseph D. Grande, K.G. Karthikeyan, John C. Panuska, Mark Powell
Keywords: Phosphorus transport, best management practices, corn silage, dairy manure, nutrient management, residue cover
There is a growing interest in corn silage utilization due to changes in animal farm
dynamics and favorable economics compared to alfalfa. The extent of residue cover influences
runoff production and soil losses, and hence, these changes will affect the off-site migration of
phosphorus (P). Since high-cut silage will increase residue cover, this method could conceivably
minimize water quality degradation that would otherwise result from harvesting corn for silage. We
examined cropping system effects on sediment and P losses from no-till fields planted in corn.
Treatments included conventional corn grain (CG) and silage (CS-L) and non-conventional, high-cut (24-26) silage (CS-H). Each treatment received one of three manure treatments: no manure,
application in fall or spring. Simulated rainfall (76 mm/hr; 1 h) experiments were performed in spring
and fall 2002, runoff from 2.0 m x 1.5 m plots collected and a sub-sample analyzed for total
sediments, dissolved reactive phosphorus (DRP), and total phosphorus (TP).