The relative biodegradability of the materials during long-term
soil incubation was PHA > co-polyester þ corn-based plastic >
composted cow manure > plastarch > paper pulps > natural
fibers > conventional plastics containing additives to enhance
biodegradability ¼ conventional plastics. For anaerobic digestion
and composting the relative biodegradability was plastarch > copolyester
þ corn-based plastic > conventional plastics with additives
and plastarch > paper pulp þ soy wax > conventional plastic
with additives, respectively.