RT Journal Article SR Electronic T1 The nitrogen dilemma: Food or the environment JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 124A OP 128A DO 10.2489/jswc.72.6.124A VO 72 IS 6 A1 B.A. Stewart A1 Rattan Lal YR 2017 UL http://www.jswconline.org/content/72/6/124A.abstract AB