The experiment was conducted on a guinea grass (Panicum maximum) pasture established in 2000 at the Teaching and Research Farm of the Department of Crop Science Faculty of Agriculture University of Nigeria, Nsukka. Nsukka is located at Latitude 060 52`N and longitude 070 24`E, and altitude of 447.2 m above sea level. It is characterized by the low land humid tropical conditions. The soil is classified as an Ultisol (Asiegbu 1989).