Among the raw materials of composting, the C/N ratio of straw
and spent mushroom substrate is too high, while the C/N ratio of
pig manure is too low, both of which are not appropriate for the
growth of microbe during the composting. We mixed the spent
mushroom substrate, wheat straw and pig manure at the ratio of
3:5:18 (by dry mass) to prepare the compost matrix in order to ad-just the appropriate C/N ratio of the matrix to 30:1