Humic acid vs fulvic acid: differences, uses and which to choose
How humic and fulvic acids differ in molecule size, solubility and use, and when to choose each for soil, drip or foliar application.
The key differences
| Humic acid | Fulvic acid | |
|---|---|---|
| Molecule size | Larger | Smaller |
| Solubility | Soluble in alkaline conditions, not in acid | Soluble at all pH |
| Colour | Dark brown to black | Yellow to golden brown |
| Main role | Soil structure, nutrient holding, roots | Nutrient transport, foliar and drip use |
| Best application | Basal, granules, soil drench | Foliar, drip, fertigation |
Which should you choose?
For tired, compact or low organic-matter soil, start with humic acid, usually as granules at sowing or as a soluble humate through drip. For foliar programmes and fertigation where solubility matters, choose fulvic-rich grades. For most farms a combined humic and fulvic product covers both jobs.
Our humic and fulvic grades
Frequently asked questions
Is fulvic acid better than humic acid?
Neither is better overall. Fulvic acid suits foliar and drip use because it dissolves at any pH; humic acid does more for soil structure.
Can humic and fulvic acid be used together?
Yes. They come from the same material and are often sold together, as in our humic and fulvic acid 25.05% liquid and 76% powder.
What is fulvic acid used for in plants?
Fulvic acid is used to help move nutrients into the plant and in foliar and drip programmes, often together with micronutrients.
Where do humic and fulvic acids come from?
Commercial products are usually extracted from humified organic sources such as leonardite or lignite.
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