It would "create a humification process (by the surface layer of humus in the soil), although this is something that happens naturally, so as verb has little use. In fact, it is not even incorporated into the English dictionary.
In Agriculture is the process of adding humus or natural fertilizer to the soil.
HUMIFY the word accepted by the SAR is HUMIDIFY to make the environment wetter. Incorporate water in gaseous, sprayed or watery form into the environment. Note: HUMECTAR OR HUMEDECER ARE SYNONYMS OF HUMIDIFY .