PERFORMANCE OF IMPROVED MAIZE CULTIVAR AS INFLUENCED BY COMPOST RATES AND POPULATION DENSITIES OF SWEET POTATO IN MAIZE/SWEET POTATO INTERCROP IN THE RAINFOREST-SAVANNAH ZONE OF NIGERIA The study was carried out between May and August, 2010 at the Teaching and Research farm of University of Agriculture, Abeokuta. Ogun State, located in the Forest-Savannah Agro-ecological zone.