Analytical quantification methods in the past measured both humic and fulvic acid as one substance. This is the operational distinction between humic and fulvic acids. "Processed" organic fertilizers include compost, humic acid, amino acids, and seaweed extracts. Dying moss forms layers of sediment and releases sugars and humic acids which consume oxygen. Dying moss forms layers of sediment and releases sugars and humic acids that consume oxygen. Potassium humate is the potassium salt of humic acid. China Green Agriculture produces and distributes humic acid based liquid compound fertilizer. The peat in mires contain a substantial amount of organic matter, where humic acid dominates. Biotic materials in soil include glomalin, Dopplerite and humic acid. Use of humic acids may prevent excess salination, especially given excessive irrigation. Leonardite is an oxidized form of lignite, which also contains high levels of humic acid. Reddish brown soil and low humic grey soil are prominent among six soil types. Fulvic acid remain in solution after removal of humic acid from humin by acidification. There is considerable overall similarity among individual humic acids. The alcohol-soluble portion of the humic fraction is, in general, named "ulmic acid".