As Darwin explained in 1881 in his last book. Earthworms fertilize the soil and give it a better structure. In addition, they favor aeration, a kind of porosity, which is very important for the roots, avoiding asphyxia in very compact and humid soils. The vermicompost improves the structural characteristics of the soil, loosening the clayey soils and adding the sandy ones.

Improving the physical fertility of the soil because it increases the active surface area, so it can retain more nutrients, and facilitates and increases the efficiency of the mechanical work of the soil, i.e. as you are using HumuX you are improving your soil.