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https://www.maximumyield.com/humic-or-fulvic-acid-what-kind-are-your-plants-on/2/1352
Humic and Fulvic Acids for Hydroponic Use
In hydroponics, both humic and fulvic acids work well, but there are minor differences. If you use RO water, humic acid may be a slightly better choice. Humic acid contains both humic and fulvic acid fractions and it has a buffering effect on pH.
RO water alone has practically no buffer for pH. When using RO water, the pH can spike upwards during rapid vegetative growth, or crash during heavy fruiting and flowering—sometimes overnight. But humic and fulvic acids help buffer pH.
In nature, humic and fulvic acids raise the pH of acidic soils and lower the pH of alkaline soils, neutralizing both conditions, while having a moderating effect on your plants. Humic acid also adds more than 62 beneficial trace elements to the water. Since RO water is stripped of nearly all of its minerals, humic and fulvic acids make a great water treatment for hydroponics.
If you use hard water, shift the balance towards fulvic acid. Hard water is usually high in calcium and magnesium ions. Since fulvic acid molecules are smaller than humic fractions, they are better at surrounding the calcium ions to help keep them soluble and available to plants.
Fulvic acid is also more acidic than most humic acid products. Since hard water is generally higher in pH, fulvic acid may be a better choice when using well water in hydroponics.
