With the high demand for single-use plastics in the Philippines, which has a negative impact on the environment, the development of biodegradable plastics for both industrial and commercial applications is critical these days. The study was conducted to determine the best bioplastic out of three staple crops in the country that can be used in the long run in the community. Bioplastic samples are created from the extraction of cassava roots, potatoes, and purple yam and tested using ASTM-D638-77, a mechanical testing method for calculating the tensile strength of an object, and the Soil Burial Test, determining the biodegradability level of the bioplastics made. Based on the findings after the experimentation and observations, the made bioplastic out of potato starch was the best bioplastic that fell under the criteria of a bioplastic with its incredible strength as well as its degradability rate. With that, it is recommended that more leading crops and plants in the Philippines are to be tested for bioplastic manufacturing such as Gabi which can also have the potential as it is a thickening ingredient. It is also great if future researchers will experiment with the amount of glycerin added to the bioplastics to work out and establish a more durable bioplastic. Last, but not the least, it is recommended to have more bioplastics shaped with different silicone mold containers to figure out how to strengthen the bioplastics out of different shapes and appearances, and structures.

Keywords : Bioplastic, Cassava, Potato, Purple Yam.