Powder Humic Acid Powder Humic Fertilizers are a finely ground mixture of alkali (KOH, NaOH) and coal (lignite) in the ratio range of 1/10 – 1/50. The introduction of salts during the preparation of the working solution allows for the cold extraction of HA and pro-huminous organic compounds to the final mixture. The main advantage of this type of production is its low cost of production and the possibility to prepare a highly concentrated mix in organic matter, not in HA (up to 120-130 g/l). www.rogitex.com