... Granule :SpecificationAppearance: black brown granule Diameter : 2-4mm Humic acid (dry base): 70%-75% Organic matter (dry base): 80 ... : Ca, Mg, S, Cu, Zn, Mn, Mo Humic Acid Granular Specification: ITEMS PROPERTIES Source:Leonardite or Lignite Appearanceblack brown ... granuleSize: 2-4mmSolubility in waterNot soluble in waterOdorodorlessHumic acid (dry basis)70-75%Organic matter (dry basis)80 ...