Within all treatments, T1 presented more or less consistent biodegradation, whereas T2 was little meander. The natural polyethylene contained vegetable starch of 6% which could have enhanced the biodegradation rate from the initial phase of experimental trial. In addition to the basal nutrients of the broth, Pseudomonas spp. might have utilized the vegetable extracts and other organic components from the natural polyethylene which may be another reason of this uniformity of biodegradation. Nevertheless, the viability of Pseudomonas in the broth on day 56 suggested that the organism was still in the log phase. This explains that the natural polyethylene provided sufficient carbon and energy source to the bacteria for growth and multiplication.