Fulvic acid

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Fulvic acids, as well as humic acids, are a family of organic acids, natural compounds, and components of the humus (which is a fraction of soil organic matter).[1] The differences between these two are the carbon and oxygen contents, acidity, degree of polymerization, molecular weight, and colour.[2] Fulvic acids remain in solution after removal of humic acid from humin by acidification.[3][4][5]

Fulvic acid is of relatively low molecular mass and is biologically more active than humic acid.[6]


  1. ^ Bremner, J. M. (1951-01-01). "A Review of Recent Work on Soil Organic Matter Part I". Journal of Soil Science. 2 (1): 67–82. ISSN 1365-2389. doi:10.1111/j.1365-2389.1951.tb00591.x. 
  2. ^ "Properties of humic substances". karnet.up.wroc.pl. Retrieved 2016-11-17. 
  3. ^ Aiken, G. R.; McKnight, D. M.; Thorn, K. A.; Thurman, E. M. (1992-07-01). "Isolation of hydrophilic organic acids from water using nonionic macroporous resins". Organic Geochemistry. 18 (4): 567–573. doi:10.1016/0146-6380(92)90119-I. 
  4. ^ Chefetz, Benny; Chen, Yona; Hadar, Yitzhak; Hatcher, Patrick G. (1998-03-04). "Characterization of Dissolved Organic Matter Extracted from Composted Municipal Solid Waste". Soil Science Society of America Journal. 62 (2). ISSN 0361-5995. doi:10.2136/sssaj1998.03615995006200020005x. 
  5. ^ Perdue, Dr. E. Michael. "IHSS - Welcome Page". www.humicsubstances.org. Retrieved 2016-11-17. 
  6. ^ Canellas, Luciano Pasqualoto; Façanha, Arnoldo Rocha (2004-03-01). "Chemical nature of soil humified fractions and their bioactivity". Pesquisa Agropecuária Brasileira. 39 (3): 233–240. ISSN 0100-204X. doi:10.1590/S0100-204X2004000300005. 

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