Hybrid yam variety TDr 89/02665 was compared with a local cultivar Igbakumo in on-farm trials in southwestern Nigeria in 2006 and 2007. The trials were to determine the productivity of the hybrid yam with and without staking of vines in the rainforest and savanna areas respectively. The local cultivar was staked in all the trials. A total of twenty and thirty farmers were used for the trials in the rain forest and savanna respectively. In the forest area, tuber yield was low in both varieties due to late planting in 2006 and yield was similar between the treatments within farms and across the farms. However, early planting in 2007 resulted in higher tuber yield of hybrid yam in all the farms. Hybrid yam tried without staking gave higher yields in 44 to 50% of the farms in the two savanna locations in 2006. The other farms recorded similar yields between the two treatments. In 2007, yield was low and hybrid yams had similar yield with Igbakumo cultivar. Rainfall was scanty during germination and growth in 2007 and this affected yam productivity. In both experiments, hybrid yam TDr 89/02665 was more responsive to environmental changes than the local cultivar using the stability analysis regression equation. Thus, the application of improved agronomic practices will increase tuber yield of hybrid yam above the local cultivar by 50%. It is suggested that cultivating the hybrid yam as early crop in rain forest will improve yield and income of farmers. In the savanna, cultivating TDr 89/02665 without staking is feasible and further selection and breeding of lines for none staking is desirable for economic and environmental reasons.
Key words: Hybrid, local cultivar, on-farm, savanna, rainforest, staking.
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