METHOD FOR OBTAINING A FERTILIZER PRODUCT, AN INTERMEDIATE PRODUCT FOR THE PRODUCTION OF A FERTILIZER PRODUCT AND A FERTILIZER PRODUCT

摘要

a fertilizer product comprising an acid-carbonized microporous matrix derived from expanded biomass and a residual acid fertilizer reaction product from the carbonization process and at least one added fertilizer precursor. Biomass may include a steam-blown wood dust. Expanded biomass can be charred with a combination of sulfuric and phosphoric acids, followed by ammonization to produce ammonium sulfate and mono- or diammonium phosphate. The fertilizer reaction product adsorbs onto the carbon matrix, which results in a slow release when the material is applied to the soil.