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Definitions (53)
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association
A natural grouping of soil associates based on similarities in climatic or physiographic factors and soil parent materials. It may include a number of soil associates provided that they are all presen [..]
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a horizon
See: horizon; soil
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ablation till
A surface deposit of loose permeable somewhat stratified sandy and stony till overlying denser till.
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absorbed water
Water held mechanically in a soil mass and having physical properties similar to ordinary water at the same temperature and pressure.
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accelerated erosion
Erosion much more rapid than normal, natural, geological erosion, primarily as a result of the influence of the activities of man or animals.
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acid soil
A soil material having a pH of less than 7.0. See also soil reaction.
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actinomycetes
Unicellular filamentous microorganisms that branch monopodially or more rarely dichotomously and form radiating colonies; mainly found in the soil, and cause of its characteristic odor.
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active acidity
The activity of hydrogen ion in the aqueous phase of a soil. It is measured and expressed as a pH value.
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adaptation
Change in an organism resulting from the action of natural selection on variation so that the organism is fitted more perfectly for existence in its environment.
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adaptive_enzyme
An enzyme produced by an organism in response to the presence of its substrate or a related substance. It is also called an induced enzyme
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