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White Guinea Yam in Different Ecological Zones of Edo State, Nigeria

By K. E. Law-ogbomo and C. O. Emokaro


Abstract: Economic analysis of the effect of different rates of NPK 15:15:15 fertilizer application on the yield of yam in three different ecological zones of Edo State was investigated in this study with the aim of determing the optimal fertilizer application rate and the most profitable ecological zone for yam production in Edo State. This study involved the use of Dioscorea rotundata Poir, fertilized with NPK (15:15:15) at rates of 0, 100, 200, 300 and 400 kg/ha using a randomized complete block design with three replicates. The crop was planted early (April) 2004 and 2005 in each of the ecological zones (Derived Savanna (Ubiaja), Forest-Savanna transition (Sabongidda-Ora) and Forest (Evboneka)). Based on the objective function of profit maximization, the optimum returns were recorded at a fertilizer application rate of 300 kg/ha in the Derived Savanna zone with a gross margin of $18,577.38, net returns of $18,225.21 and a benefit-cost ratio of 5.10. In the Forest-Savanna transition zone, optimum rate of fertilizer application was also at 300 kg/ha with a gross margin of $13,794.78 and benefitcost ratio of 3.76. Optimum rate of fertilizer application however dropped to 200 kg/ha in the Forest zone with a gross margin of $13457.39, net returns of $13110.61 and benefit-cost ratio of 3.73. This shows that farmers in the Derived Savanna and Forest-Savanna transition zones stand in a better position to make more profit from yam production through the application of higher rates of fertilizer than farmers in the forest zone. However, soils in the forest zones are naturally fertile and as such require lower fertilizer application rates than in the other zones. Key words: Edo State Optimum application rate Resource-poor farmers Staple foo

Year: 2014
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