Breeding Gains, Diversity Analysis and Inheritance Studies on Soybean [Glycine max (L.) Merrill] Germplasm in Zimbabwe By Hapson Mushoriwa BSc, MSc and MBA (University of Zimbabwe) A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (PhD) in Plant Breeding School of Agricultural Earth and Environmental Sciences College of Agriculture, Engineering and Science University of KwaZulu-Natal Pietermaritzburg Republic of South Africa 29 November 2013 1