Proceedings of symposium - Hargrove, W. L.,; Ellis, B. G.,; Cavalieri, T.,; Johnson, R. C.,; Reginato, R. J.,; Black, A. L.,; Mannering, J. V.,; G. H. Heichel,; Stuber, C. W.,; Kissel, D. E.,; Mickelson, Sherri, (American Society of Agronomy ; Crop Science Society of America ; Soil Science Society of America, 1988)