Proceedings of a symposium - Bethlenfalvay, G. J.,; Linderman, R. G.,; Power, J. F.,; Doran, J. W.,; Skipper, H. D.,; Peterson, G. A.,; Baenziger, P. S.,; Luxmoore, R. J.,; Ernst, Susan, (American Society of Agronomy ; Crop Science Society of America ; Soil Science Society of America, 1992)