C = Carbon
N = Nitrogen
These proportions characterize the different MO (organic matter) and allow us to anticipate how to combine them so that they decompose properly. A lot of carbon (high ratios) makes composting very slow and a lot of nitrogen (low ratios) can cause problems for earthworms. To optimize the process, the materials to be composted must be adjusted to ratios between 25/1 and 40/1.