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Interestingly, in addition to being a source of nitrogen and phosphorus chicken manure is also a major source of arsenic. This land applied chicken manure is a threat to surface and groundwater.
See the article below.
http://pubs.acs.org/subscribe/journals/esthag-w/2006/mar/science/kc_chickenpoop.html
This should be great news for Oklahoma, which has been involved for years in litigation with Arkansas. It seems that the wild and scenic rivers and reservoirs of northeast Oklahoma are fed by the open sewers of the chicken farms of northwest Arkansas. Maybe Oklahoma can build dams and fertilizer plants at the border.