Mineral Source Leonardite Source Fulvic Acid (Potassium Fulvate) Fulvic Acid can be dissolved speedily in water by stirring, can be flocculent sedimentation in acidic water (PH<3), and is suitable to be used as humic acid liquid fertilizer, flush fertilizer and foliar fertilizer which are necessary to comply with the new standard of "humate water-soluble fertilizer" formulated by Chinese Ministry of Agriculture.