Adjective
converted to humus
Source: WordNethumified soil Source: Internet
However, humified organic matter, when examined under the microscope may reveal tiny plant, animal or microbial remains that have been mechanically, but not chemically, degraded. citation This suggests a fuzzy boundary between humus and organic matter. Source: Internet
Fully humified organic matter, on the other hand, has a uniform dark, spongy, jelly-like appearance, and is amorphous. Source: Internet