Journal of Agronomy1812-53791812-5417Asian Network for Scientific Information10.3923/ja.2006.492.496Dioscorea species) Tuber Yield in Two Soil Types of Nigeria]]>AjayiS. S.AkinrindeE. A.AsieduR. 3200653Fertilization is crucial to crop productivity sustenance under continuous land-use, but crop response could vary widely in different agro-ecologies. Effectiveness of sole and combined organic fertilizer- O.F, 0.6% N; crystallizer- 8.83% P; muriate of potash- MOP- 49.8% K; triple superphosphate- TSP- 19.22% P and urea- 45% N (replicated thrice in randomized complete block design) for yam (Dioscorea rotundata i.e., TDr-99-6 and Dioscorea alata i.e., TDa-98/01176) performance were evaluated on Typic paleudalf (at Ibadan, Rainforest) and Arsenic haplustalf (at Abuja, Guinea Savanna) in Nigeria. Short-term and residual-effect differences in TDr-99-6 tuber yields were insignificant (p<0.05) while highest TDa-98/01176 yield (40.21 t ha-1) was obtained with urea at Ibadan. Residual effects of O.F+TSP enabled TDa-98/01176 to produce the highest yield (27.97 t ha-1) at Abuja. TDa-98/01176 out-yielded TDr-99-6 but with dry-matter contents being more dependent on fertilizer treatment. The hypothesis that O.F effects could improve with increased application rates needs to be tested.]]>Amon, B.O.E. and S.A. Adetunji, 19701970Bollard, M.D.A. and R.J. Gilkes, 1990243346Fritschi, F.B., B.A. Robert, D.W. Rains, R.L. Travis and R.B. Hutmacher, 200569718728Gutser, R., T.H. Ebertseder, A. Weber, M. Schraml, U. Schmidhalter, 2005168439446Heber, R., G. Ricardo and C. Ulises, 1995Dioscorea alata grown in the ultisol without vine support. ]]>79121130Kayode, G.O., 1985Dioscorea rotundata. ]]>21289393Obigbesan, G.O., A.A. Agboola and A.A.A. Fayemi, 19771977pp: 12Ricardo, J.G. and I. Heber, 19948610831087Singaram, P. and G.V. Kothandaraman, 199240212215Soil Survey Staff,20039th Edn.,Some, S., O. Kam and O. Ouedraogo, 19954163169FPDD,19991999IITA and NRCRI,19991999Ojating, I.,19971997pp: 2326