Humic Acid 50-55% Granule Soil Conditioner NPK: 3-5% , Humic acid : 50%-55%, Trace element: Ca, Mg, S, Cu, Zn,Mn, Mo Humic Acid 50-55% Granule Soil Conditioner :SpecificationAppearance: black brown granule Diameter : 2-4mm Humic acid (dry base): 50%-55% Organic ... matter (dry base): 60%-65% NPK: 3-5% Trace element: Ca, Mg, S, Cu, Zn, Mn, Mo Humic Acid ...