The increase in the drying rate was apparently due to the increased heat transfer potential between the surrounding air and sweet potato cubes as well as the higher moisture diffusivity, thus enhancing the evaporation of water from sweet potato cubes. This observation of temperature effect on the drying rate of sweet potato is in good agreement with the findings of Akpinar et al. (2003), Mohammadi et al. (2008) and Saeed et al. (2008). However, at higher than 90 ◦C, the dried product was partially lost its fresh product characteristics (Ozdemir and Devres, 1999).