Humic Acid is a kind of high polymer heterogeneous aromatic material contains hydroxyl, carboxyl, phenolic hydroxyl and other active gropus with black or brown powder or granule, it’s weak acidity. It is the best additive for organic fertilizer&is the raw material for humic acid fertilizer, also used for soil ameliorator, plant growth stimulator and can be completely absorption 100% by soil crop improver, also it could be mixed with micro-elements N,P,K for blending for base fertilizer.