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What is the difference between Humic acid and Fulvic acid?

Fulvic acid is the lowest molecular weight portion of humic substances. 

By definition, it will be golden in color where humic acid will be brown to black.  Because of its small molecular size, fulvic acid is able to penetrate the leaf and even the mitochondria of a cell which makes it great for foliar sprays and root drenches. 

By comparison, humic acid is a fantastic soil conditioner and better for dry broadcast and soil/soil-less application.

Typically each manufacturer will give a product analysis differentiating the fulvic from the humic; however, some states do not accept the fulvic acid analysis and will refer to all substances as humic acids. 

To further confuse things, a standardized industry method for analyzing humic substances does not exist.  This creates a range of concentrations and analyses for humic products. 

At the end of the day, it is best to conduct bioassays and test the products yourself to see which one will do best.


Saosis is one of the leading manufacturers of Humic acid and Fulvic acid in India.

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