Definitions

1. verb

to convert organic matter into humus through microbial activity, especially to convert dead plant or animal residues into a rich, earthy-smelling substance

“The gardener humified the compost pile to create a nutrient-rich fertilizer.”

2. noun

a substance resulting from the humification of organic matter, typically having a rich, earthy smell

“The gardener added humus to the soil to improve its fertility.”