This product is black or coffee powder, dissolve speedly in water by stirring, water-insoluble substance<5%, can be flocculent sedimentation in acidic water (pH<3), and is suitable to be used to produce humic acid liquid fertilizer, flush fertilizer and foliar fertilizer which are necessary to comply with the new standard of "humic acid water-soluble fertilizer" formulated by Chinese Ministry of Agriculture. But it is not suitable to be used to produce acidic foliar fertilizer or containing microelements foliar fertilizer. Its activity is superior to coal humic acid. But this product contains HA 75%, and brown product contains HA 30% according to the new measure of Chinese Ministry of Agriculture, mainly because molecular weight of brown product is lower and has strong acid resistance.
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