I checked your Seminar ppt and would like to suggest you as below.
1. I think you should add more slides because I don't think these slides will be enough for 15 minutes.
2. Where is your objective?
3. For data that you showed the number of indigenous vegetables in each region, I think if you show those data in the graph format. It will help your audiences more understand and know that which region still use more indigenous vegetables than others.
4. Don't forget the discussion part!
Please send me your script after you edited it with my suggestion. I will be back to Sakon Nakhon on Monday. Are you free about 3.00 pm? If so, come and meet me at my office.
Hope you will enjoy with your seminar presentation!