RT Journal Article SR Electronic T1 What science can and cannot provide policy makers in managing agricultural landscapes for environmental quality JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 181A OP 182A DO 10.2489/jswc.63.6.181A VO 63 IS 6 A1 Otto Doering YR 2008 UL http://www.jswconline.org/content/63/6/181A.abstract AB