RT Journal Article SR Electronic T1 Cover crop impacts on US cropland carbon sequestration JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 117A OP 121A DO 10.2489/jswc.73.5.117A VO 73 IS 5 A1 Sami Tellatin A1 Robert L. Myers YR 2018 UL http://www.jswconline.org/content/73/5/117A.abstract AB