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 Stewart, B.A. A1 Lal, Rattan YR 2017 UL http://www.jswconline.org/content/72/6/124A.abstract AB