As plant residue decomposes in soil, the residue loses carbon as CO 2 and it's C:N ratio widens.
(plant residue; decomposes; L:in soil) (it; 's; C) (N ratio; widens; ) Context(N ratio widens,List([81, 95))):(the residue; loses; carbon; as CO 2)
N ratio widens,List([81, 95))
plant residue it N ratio the residue
decomposes 's widens loses
L:in soil
C
carbon as CO 2