Multi-locational trials were conducted in four selected locations with the forest-savannah agro-ecological zone of Nigeria to investigate the spatial variability in the yield of cassava. In an attempt to compare the yield of cassava within the forest-savannah eco-climatic zone of Nigeria, four locations including Ibadan, Abeokuta, Akure and Oshogbo were selected for field trials. Four improved cassava cultivation (TMS 30572, TMS 91934, TMS 50395 and TMS 30555) were grown between 2009 and 2010 in these locations and harvested at 12 months after planting. Results obtained showed that there were significant differences in the yield of cassava in the four selected locations with Ibadan having the highest tuberous root per hectare among the four locations. TMS 30572 had the highest (52,964 t. ha-1) number of tuberous root per hectare among the four varieties of cassava planted. This study revealed that cassava yield decreased with increase in rainfall distribution in the forest-savannah agro-ecological zone of Nigeria.
Key words: Cassava, tuberous root, spartial variability, rainfall distribution.
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