Re: Humic Acid

Humic acid is a condensed, refractive mixture of aromatic organic acids. 
It is complex and variable and has not been characterized (as far as I 
know) to any degree (except perhaps for some of the many functional 
groups). Humic acid contains Sulfur, Nitrogen and Phosphorus in varying 
amounts. It also contains metals such as Ca, Mg, Cu, Zn etc. which can be 
'chelated' in some undefined way. Humic acid can be broken down into two 
groups based on the polarity and size of the individual 'compounds'. The 
smaller, more polar fraction is generally termed fulvic acid and the 
larger, more nonpolar fraction is generally termed humic acid.
Humic acids are the endproduct of microbial degradation of plant and animal 
debris and are one of the most important constituents of fertile soils.

dave huebert