In Tables 2 and 3, oil yield increased as the pressing time increased for all the pressure applied on both the fine and coarse samples.
There is significant (p< 0.005) difference in percentage oil yield obtained at the different pressing times. This can be said to be true for most oil seeds as reported for melon (Ajibola, 1988) and conophor seed (Fashina and Ajibola, 1989).
If oil were to be expressed at a pressure of 60.6 kpa, more time will be needed before maximum yield will be obtained. However, the same amount of oil obtained after 12 min from 60.6 kPa would have been obtained within the first
three minutes from 116.6 kPa applied pressure. There is also significant (p < 0.05) difference in oil yield at different applied pressure and pressing
times.