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2. Potassium humate - Wikipedia

   en.wikipedia.org/wiki/Potassium_humate

   Potassium humate is used in agriculture as a fertilizer additive to increase the efficiency of fertilizers especially nitrogen- and phosphorus-based fertilizer inputs. Other salts of humic acid are manufactured, mainly sodium humate, which is used in animal health supplements. It also can be used in aquaculture.

3. Humic substance - Wikipedia

   en.wikipedia.org/wiki/Humic_substance

   Extracted humic acid not a single acid; rather, it is a complex mixture of many different acids containing carboxyl and phenolate groups so that the mixture behaves functionally as a dibasic acid or, occasionally, as a tribasic acid. Commercial humic acid used to amend soil is manufactured using these same well established procedures.

4. Compost - Wikipedia

   en.wikipedia.org/wiki/Compost

   The benefits of compost include providing nutrients to crops as fertilizer, acting as a soil conditioner, increasing the humus or humic acid contents of the soil, and introducing beneficial microbes that help to suppress pathogens in the soil and reduce soil-borne diseases.

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6. Humus - Wikipedia

   en.wikipedia.org/wiki/Humus

   However, some authors [16] suggest that complex soil organic molecules may be much less stable than previously thought: "the available evidence does not support the formation of large-molecular-size and persistent 'humic substances' in soils. Instead, soil organic matter is a continuum of progressively decomposing organic compounds.″

7. Humin - Wikipedia

   en.wikipedia.org/wiki/Humin

   Humins make up about 50% of the organic matter in soil. [1] Due to their very complex molecular structure, humic substances, including humin, do not correspond to pure substances but consist of a mixture of many compounds that remain very difficult to characterize even using modern analytical techniques. [2]

8. International Humic Substances Society - Wikipedia

   en.wikipedia.org/wiki/International_Humic...

   The International Humic Substances Society maintains a collection of standard and reference samples of humic and fulvic acids extracted and fractionated from leonardite, river water, a mineral soil, and peat, plus natural organic matter isolated from river water by reverse osmosis, [4] without fractionation. [5]

9. Organic fertilizer - Wikipedia

   en.wikipedia.org/wiki/Organic_fertilizer

   Processed organic fertilizers include compost, liquid plant manures, humic acid, grain meal, amino acids, and seaweed extracts. Other examples are natural enzyme-digested proteins. Decomposing crop residue (green manure) from prior years is another source of fertility.