Bibliography: leaves 300-321. / xiii, 321 leaves [11] leaves of plates : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis aims to extend knowledge and understanding of the seed-seedling dynamics and productivity of annual Medicago pastures. In particular this study concentrates on the impact of grazing by sheep on Medicago pasture herbage and seed production and sheep body weight gains. / Thesis (Ph.D.)--University of Adelaide, Depts. of Agronomy and Farming Systems and Plant Science, 1997