RT Journal Article SR Electronic T1 Equipment modification and innovation for conservation tillage JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 182 OP 185 VO 38 IS 3 A1 D. C. Erbach A1 J. E. Morrison A1 D. E. Wilkins YR 1983 UL http://www.jswconline.org/content/38/3/182.abstract AB