Cooperative Research Centre for Soil and Land Management RoviraAlbert Delfin 2018 Lecture given by Doctor Albert D. Rovira, CSIRO Division of Soils, Canberra, ACT at the Waite Campus, University of Adelaide, 10.5.1991.<p><br></p><p>This lecture is part of the Campus Seminars and Distinguished Lecturer Series, Waite Campus, University of Adelaide, 1991 – 1997. </p> <a href="https://figshare.com/projects/Campus_Seminars_and_Distinguished_Lecturer_Series_Waite_Campus_University_of_Adelaide/17756">https://figshare.com/projects/Campus_Seminars_and_Distinguished_Lecturer_Series_Waite_Campus_University_of_Adelaide/17756</a>