Humic acid increases the availability of nutrients in our fertilizers and in those already existing in your soil. ... It will also help to lower the pH of the soil to a more neutral level and will flush high levels of salts out of the root zone, all of which will help to promote better plant health and growth.

Does humic acid affect pH?

The addition of humic acid will exchange H + cations to cause lower soil pH. ... The higher the content of clay and organic matter, the smaller the pH change, as in the case on soil 2.

Is humic acid acidic or alkaline?

Humic acid and fulvic acid represent up to 80% of the TOC – dissolved organics – of natural waters. Humic substances are weak acidic electrolytes with carboxylic- and phenolic-OH groups with a micelle-like structure and with a molecular weight between 500 (fulvic) and 100,000 (humic).