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acid humus

См. также в других словарях:

  • acid humus — noun : humus with a pH below 7.0 …   Useful english dictionary

  • Humus — (Origin: 1790–1800; < Latin : earth, ground [ humus. Dictionary.com Unabridged (v 1.1). Random House, Inc. 23 Sep. 2008. .] ) is the organic material in soil lending it a dark brown or black colouration. In soil science, humus refers to any… …   Wikipedia

  • Humic acid — is one of the major components of humic substances [http://www.ihss.gatech.edu/whatarehs.html] which are dark brown and major constituents of soil organic matter humus that contributes to soil chemical and physical quality and are also precursors …   Wikipedia

  • humic acid — a brown, melanin tinted mixture of polymers, found in lignite, peat, and soils, where it acts as a cation exchange agent: used in drilling fluids and inks. [1835 45] * * * ▪ chemistry       one of two classes of natural acidic organic polymer… …   Universalium

  • fulvic acid — ▪ chemical compound       one of two classes of natural acidic organic polymer that can be extracted from humus found in soil, sediment, or aquatic environments. Its name derives from Latin fulvus, indicating its yellow colour. This organic… …   Universalium

  • humic acid — noun 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 • Hypernyms: ↑humic substance * * * noun : any of various organic acids that are insoluble in alcohol …   Useful english dictionary

  • geic acid — Humin Hu min, n. [L. humus the earth, ground.] (Chem.) A bitter, brownish yellow, amorphous substance, extracted from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; called also {humic acid}, {ulmin} …   The Collaborative International Dictionary of English

  • humic acid — Humin Hu min, n. [L. humus the earth, ground.] (Chem.) A bitter, brownish yellow, amorphous substance, extracted from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; called also {humic acid}, {ulmin} …   The Collaborative International Dictionary of English

  • fulvic acid — noun A straw coloured extract of humus that remains after humic acid has been precipitated with acid …   Wiktionary

  • humic acid — hu·mic acid hyü mik , yü n any of various organic acids obtained from humus …   Medical dictionary

  • humic acid — n. a brown powder consisting of organic acids, derived from humus …   English World dictionary

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