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| Fauna Faunal Fertilizer Flavonoids Flocculation Flora Floral Flotation Free Oxygen Fulvates Fulvic Acids Fungicide |
| The fraction of humic substances that is soluble in water under all pH conditions. They remain in solution after removal of humic acid by acidification. From "fulvus" meaning yellow, fulvic acids are light yellow to yellow-brown in color. |