In general, the fertility of soil is a function of the fungi resident therein. You can see with the naked eye that HCF supports fungal growth & proliferation by the white mycelia that fill the spaces between the black carbon and biochar granules in the soil to which it has been applied. Microscopically the high surface area of the carbon inputs provides for the homing of bacteria, such as that facilitates their population growth. HCF is compatible with and adds value to:

1. Composts
2. Paunch or other abattoir wastes
3. Processed animal manures
4. Chicken litter or
5. Sterilised sewage sludge

Although HCF does not have high levels of
NPK (Nitrogen, Phosphate & Potassium) and Ca/Mg (Calcium and Magnesium) all that it has are available to plants, unlike the normal situation where only part is taken up by the plant due to losses as described above.
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The formulation of HCF is well balanced, so not likely to become limiting by exhausting one particular inorganic nutrient ingredient.
There is debate about the role of Silicon in plant growth and defence of integrity from external agents, climatic viz hot >40C and cold < 4C, i.e. in frost, insect predation or microbial pathogenesis. Most likely it is in the ionised and soluble Sodium or more likely Potassium Silicate salts, that are efficacious in the HCF composition. HCF has a large amount of Silicon as Silicate, nearly 10%.There is a broad range of trace minerals in the HCF formulation, all of which are essential in the metabolism of living and for growth and reproduction. They too are retained in the carbon/biochar/zeolite matrix.Perhaps the most important feature of HCF formulations is that they are superparamagnetic with a Callaghan number of 980, just below 1000. There is some controversy of the relationship between this number and predicted effect on plant growth but the Biodynamic Farmers equate this with energy, in the same way that magnetic fields have a potential energy, superparamagnetic fields have a similar potential energy, translatable into improved growth.In the manufacturing process for HCF a cross-linked polymer is added immediately before the pelleting press. When these pellets are wetted as in the case of rain or by irrigation, they swell and break apart, releasing the pellet ingredients into the surrounding soil. The polymer then can take up any free water and pass it to any of the solid media which are more hydrophilic (i.e. loving water) than it is, especially the zeolite and the char, but also the brown coal.