The researchers studied how bark and piggery manure byproduct composts change during composting. They found that the mature composts were black and dark brown, with a good earthy odor. The pH and EC levels stabilized at certain values, and organic matter decreased over time. Total nitrogen levels stayed constant or increased initially but decreased later on. C/N ratios and CEC levels also stabilized. Lignin content increased while cellulose and hemicellulose decreased during composting.