humus (hyo͞o`məs), organic matter that has decayed to a relatively stable, amorphous state.It is an important biological constituent of fertile soil soil, surface layer of the earth, composed of fine rock material disintegrated by geological processes; and humus, the organic remains of … Soil Taxonomy. Mollisols are characterized by a significant accumulation of humus in the surface horizon, or uppermost layer, which is almost always formed under native grass vegetation. It is organic because of accumulation of carbon and is hence dark in colour. In some parts of the world, windblown dust and silt blanket the land. Humus is a complex organic substance resulting from the breakdown of plant material in a process called humification. humus definition: 1. dark earth made of organic material such as decayed leaves and plants 2. dark earth made of…. When glaciers grind rocks to a fine powder, loess can form. I - Soil Geography - Maria Sala, Xavier Ubeda and Sara Bernia ©Encyclopedia of Life Support Systems (EOLSS) SOIL GEOGRAPHY Maria Sala, Xavier Ubeda and Sara Bernia Department of Physical Geography, University of Barcelona, Spain. This process can occur naturally in soil, or in the production of compost. It has very important constituents to keep … It is also a key component of ocean water, dystrophic lakes, and upland streams. Litterfall, plant litter, leaf litter, tree litter, soil litter, or duff, is dead plant material (such as leaves, bark, needles, twigs, and cladodes) that have fallen to the ground.This detritus or dead organic material and its constituent nutrients are added to the top layer of soil, commonly known as the litter layer or O horizon ("O" for "organic"). Pronunciation: (hy'mus or, … Loess is mostly created by wind, but can also be formed by glaciers. humus hyo͞o´məs , organic matter that has decayed to a relatively stable, amorphous state. humus the organic material that is derived from the breakdown of plant and animal material occurring in the surface layers of the soil. Humus is black and colloidal in nature, coa It is an important biological constituent of fertile soil . What is Humus? Keywords: Soil horizon, fertility, humus, soil genesis, leaching, degradation, erosion. Answer. Humus is rich in carbon and is generally acidic as a result of its humic acid content. A humic acid is any of a variety of organic acids obtained from organic constituents of soil (humus), coal, and peat. ... humus: Meaning and Definition of. Humus is defined as black organic matter formed in soil due to the decay of dead plant and animal matter. Definition - What does Humic Acid mean? Humus definition is - a brown or black complex variable material resulting from partial decomposition of plant or animal matter and forming the organic portion of soil. Find definitions for: hu•mus. Humus is formed by the decomposing action of soil microorganisms (e.g., bacteria and fungi), which break down animal and vegetable material into elements that can be used by growing plants. Brush up on your geography and finally learn what countries are in Eastern Europe with our maps. Mollisol, one of the 12 soil orders in the U.S. This layer of fine, mineral-rich material is called loess. GEOGRAPHY – Vol. There he would find the following definition: “Humus, black-brown matter in the topsoil, is produced by the putrefaction of vegetable and animal matter. Contents 1. They are highly arable soils used principally for growing grain Learn more. geography. Of compost substance resulting from the breakdown of plant material in a process called humification carbon and generally. 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