How humic acid works on soil

When the soil is less fertile also sandy to some extent, humic acid will increase its cation exchange capacity to retain water and beneficial micro nutrients. 

Under heavy and compact conditions, humic acid will work with fungi to construct a crumb structure root to absorb water oxygen and nutrients. 

When the soil is alkaline, Humic acid can buffer the pH and convert the nutrients and trace elements into absorbable form and promote their uptake by the roots;

 When in acidic soil, humic acid will reduce the toxins such as ally aluminum and heavy metals,which will be bonded firmly and immobilized. 

And the bonded phosphate by aluminum will be released. Under Salinalised soil, the salt are split up by the C.E.C