PublicationPublication Type: Journal Article Authors: Matthew J. Helmers; Xiaobo Zhou; Heidi Asbjornsen; Randall K Kolka; Mark D Tomer; Richard M Cruse Source: Journal of environmental quality, Volume 41, Number 5, p.1531-1539 (2012) ISBN: 0047-2425 URL:https://doi.org/10.2134/jeq2011.0473