Papers from two symposiums of annual meetings - Kittrick, J. A.; Busacca, A. J.; Franzmeier, D. P.; Heil, R. D.; Nettleton, W. D.; Peterson, F. F.; Zelazny, L. W.; Holzhey, C. S.; Eswaran, Hari; Mortvedt, John J.; Dinauer, Richard C.; Mickelson, Sherri H. (Soil Science Society of America, Inc. ; American Society of Agronomy, Inc., 1985)