The major nutrients required by cassava for optimum top growth and tuber yields are nitrogen (N) and potassium K (Ogbigbesan and Fayemi1976, Howler, 1991). Soils that have low N (< 0.10% total N) and K (< 0.15 meq/100g) will require an additional fertilizer for optimum tuber yield (Kang and Okeke, 1991). Adequate K levels in soil stimulate response to N fertilizers but excess amount of both nutrients leads to luxuriant growth at the expense of tuber formation (Sanchez 1976, Onwueme and Charles 1994, Wilson and Ovid 1994)