RT Journal Article SR Electronic T1 Subsurface drainage and liquid manure JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 94A OP 97A VO 61 IS 3 A1 James J. Hoorman A1 Martin J. Shipitalo YR 2006 UL http://www.jswconline.org/content/61/3/94A.abstract AB