Location of the Study Area
The soil samples were collected from two borrow pits around Afe Babalola University, Ado Ekiti. The first borrow pit is along Afe Babalola-Ijan road and second borrow pit is along Afe Babalola farm. Ado-Ekiti (urban township capital of Ekiti state, Nigeria) lies on latitude 70 37’North of the equator and on longitude 50 13’East of the Greenwich Meridian. It stands on the altitude of about 455 meters above the sea level. The first borrow pit (borrow pit 1) lies on latitude 70 35’North of the equator and on longitude 50 18’ East of the Greenwich meridian with altitude 377.3m. The second borrow pit (borrow pit 2) lies on latitude 70 36’North of the equator and on longitude 50 18’ East of the Greenwich meridian. The altitude is 357m. The soil samples were taken at a depth of 1.0m from the surface.