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Effects of Sett Size and Spacing on Tuber Yield of White Guinea Yam (Dioscorea rotundata) in the Rainforest and Savanna Zones of Nigeria

SUMMARY Field studies designed to investigate the effects of sett size and spacing on tuber yield of white Guinea yam were conducted in three locations over a two year period in the rainforest and savanna zones of Nigeria. Sett weights larger than 400 g could be used for maximum tuber yields in both forest and savanna zones. Spacing had no significant effects on tuber yield in the savanna zone, but optimum spacing has yet to be identified in the forest zone.