humin definition

  • noun:
    • The area of the natural matter in soil that will not break down in dilute alkali
    • A bitter, brownish-yellow, amorphous material, obtained from vegetable mold, and also created by the activity of acids on specific sugars and carbohydrates; -- labeled as in addition humic acid, ulmin, gein, ulmic or geic acid, etc.
    • A neutral indifferent compound stated by Mulder to occur in black humus.
    • a black humic material that's not dissolvable in water

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