Christie, Stuart, Ian2017-05-112017-05-111995http://hdl.handle.net/10539/22535Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy Faculty of Science University of Witwatersrand Johannesburg SOUTH AFRICAA three-year study was undertaken In the province of Mpumalanga, South Africa to Investigate the competitive effects of the grass Setaria megaphylla on the growth of the tree species Pinus patula. A replacement series field trial, where six different competition regimes were Implemented, clearly demonstrated the suppressive effects of S. ( Abbreviation abstract )enPinus patula -- South Africa.Setaria -- South Africa.Trees -- GrowthForest ecology -- South AfricaCompetition (biology) -- South AfricaThesis