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Lecture given by Professor Ross M. Welch, USDA-ARS, Soil Plant and Nutrition Lab., Cornell University, USA at the Waite Campus, University of Adelaide, 20.9.1991.This lecture is part of the Campus Seminars and Distinguished Lecturer Series, Waite Campus, University of Adelaide, 1991 – 1997. https://figshare.com/projects/Campus_Seminars_and_Distinguished_Lecturer_Series_Waite_Campus_University_of_Adelaide/17756 |