Definitions for humic acid
hu·mic acid

Princeton's WordNetRate this definition:0.0 / 0 votes

1. humic acidnoun

   a dark brown humic substance that is soluble in water only at pH values greater than 2

   "the half-life of humic acid is measured in centuries"

WiktionaryRate this definition:0.0 / 0 votes

1. humic acidnoun

   a complex mixture of organic acids produced by the decomposition of vegetable matter

WikipediaRate this definition:0.0 / 0 votes

1. humic acid

   Humic substances (HS) are organic compounds that are important components of humus, the major organic fraction of soil, peat, and coal (and also a constituent of many upland streams, dystrophic lakes, and ocean water). For a long era in the 19th and 20th centuries, humic substances were often viewed through a lens of acid–base theory that described humic acids (HA), as organic acids, and their conjugate bases, humates, as important components of organic matter. Through this viewpoint humic acids were defined as organic substances extracted from soil that coagulate (form small solid pieces) when a strong-base extract is acidified, whereas fulvic acids (FA) are organic acids that remain soluble (stay dissolved) when a strong-base extract is acidified. The remaining alkali-insoluble part of humus would be termed humin. Humic matter in isolation is the result of a chemical extraction from the soil organic matter or the dissolved organic matter and represent the humic molecules distributed in the soil or water. A new understanding views humic substances not as high-molecular-weight macropolymers but as heterogeneous and relatively small molecular components of the soil organic matter auto-assembled in supramolecular associations and composed of a variety of compounds of biological origin and synthesized by abiotic and biotic reactions in soil. It is the large molecular complexity of the soil humeome that confers to humic matter its bioactivity in soil and its role as plant growth promoter.The academic definition of humic substances is under debate as "humification" becomes unsupported as a special case, leading to some radical definitions expanding HS to encompass all difficult-to-characterize soil organic matter, at the cost of clarity. There is also a call to forgo the traditional alkali extract method and directly analyze the soil, but its complexity prevents widespread adoption in agriculture. In practice, this means some sources may apply a traditional acid-base analysis to compost, then state the results in term of "humic substances".

ChatGPTRate this definition:0.0 / 0 votes

1. humic acid

   Humic acid is a complex mixture of organic substances, primarily derived from the decay of plant and animal matter in the soil. They are large, complex molecules containing carbon, hydrogen, oxygen, nitrogen, and occasionally sulfur, phosphorus, and other elements. Humic acids play a crucial role in soil fertility and plant nutrition, influencing the chemical properties of the soil, retaining water, and promoting microbial activity, nutrient uptake, and plant growth. They also act as buffering agents, controlling the pH levels of the soil.

WikidataRate this definition:0.0 / 0 votes

1. Humic acid

   Humic acid is a principal component of humic substances, which are the major organic constituents of soil, peat, coal, many upland streams, dystrophic lakes, and ocean water. It is produced by biodegradation of dead organic matter. It is 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. Humic acids can form complexes with ions that are commonly found in the environment creating humic colloids. Humic and fulvic acids are commonly used as a soil supplement in agriculture, and less commonly as a human nutritional supplement. As a nutrition supplement, fulvic acid can be found in a liquid form as a component of mineral colloids. Fulvic acids are poly-electrolytes and are unique colloids that diffuse easily through membranes whereas all other colloids do not. "Synthesis of fulvic acid was accomplished by a route involving selective ozonization of 9-propenylpyranobenzopyran, obtained by a regioselective cyclization of the 2-methylsulphinylmethyl 1,3-dione."

Matched Categories

1. • Humic Substance

How to pronounce humic acid?

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Numerology

1. Chaldean Numerology

   The numerical value of humic acid in Chaldean Numerology is: 1

2. Pythagorean Numerology

   The numerical value of humic acid in Pythagorean Numerology is: 8

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=humic acid
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Humic_Acid
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Humic_Acid
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=humic acid