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Definitions (114)
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soil biology
A scientific discipline dealing with living components of soils, which are represented mainly by bacteria, fungi, protozoa, nematodes, arthropods and earthworms as well as by mammals.
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soil texture
Numerical proportion (% by wt.) of sand, silt and clay in a soil. Sand, silt and clay content are estimated in the field, and/or quantitatively in the laboratory, and then placed within the texture tr [..]
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absorption
Uptake of matter or energy by a substance
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acid soil
Soil with a pH value less than 7.0.
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acidification
Process whereby soil becomes acid (pH < 7) because acid parent material is present or in regions with high rainfall, where soil leaching occurs. Acidification can be accelerated by human activities [..]
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adsorption
Process by which atoms, molecules or ions are retained on the surfaces of solids by chemical or physical bonding.
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aeration of soil
Amount of air-filled pores in the soil, expressed as the volume difference between total porosity and actual soil moisture. Optimum soil aeration is 30% but strongly depends on the structure and packi [..]
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aggregate
Soil aggregate consisting of two or more soil particles bound together by various forces.
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aggregation
Process whereby primary soil particles (sand, silt, clay) are bound together, usually by natural forces and substances derived from root exudates and microbial activity. Soil aggregates are arranged t [..]
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anion
Particle with a negative charge. See also ion, cation.
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