**6. Conclusions**

Several conclusions can be made from the experimental work discussed in this chapter. These include the following;


Like any other study, this work was not without limitations. The first limitation regards the effect of weather, soil and plant variations on oil yield and properties. The study was not able to test seed oils from birrea plant specimens from several locations and growing condi‐ tions to establish the effect of these factors on oil yield and properties of derived biodiesel.

Furthermore, this study investigated birrea biodiesel processed from crude parent oil that was extracted from plants growing under natural conditions. Since oil yield under natural conditions may differ significantly from that under optimised conditions, the result estab‐ lished in this study serves to provide baseline data for determining indigenous oil plants that are good candidates for further exploration.
