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| abatis |
an obstacle constructed by bending and sharpening the branches of trees or implanting sharpened limbs in a soil barricade, sometimes interlaced with barbed wire. |
| ABC soil |
a soil made up of three distinct layers, the A, or top layer, being humus and organic matter, the B layer being clay and oxidized material, and the C layer being loose rock and mineral materials. |
| acidic |
containing a high proportion of acid-forming silica, as rocks or soil. [1/3 definitions] |
| actinomycin |
any of several antibiotics derived from soil bacteria that work against certain other bacteria and fungi. |
| agro- |
soil; earth; field. |
| agrobiology |
the applied science of plant growth and nutrition aimed at improving soil conditions and crop yield. |
| agronomy |
the study and application of scientific methods of soil management and field crop production; scientific agriculture. |
| A horizon |
the uppermost layer of soil in a geological soil profile; topsoil. |
| alkali |
a soluble salt found in some soil composition, making it unfit for agriculture. [1/2 definitions] |
| alkaline |
of soil, having a pH above seven. [1/2 definitions] |
| alkalinize |
to add salt to (soil). [1/2 definitions] |
| alluvium |
sand, soil, gravel, or the like deposited by moving water, as along a river bed. (Cf. eluvium.) |
| ammonification |
the formation of ammonia by bacterial action on nitrogenous organic matter, as in soil. [1/2 definitions] |
| angle of repose |
the greatest angle of incline at which sand, stones, soil, or the like will not slide or roll downhill. |
| aquiculture |
the growing of plants, often for their edible fruits, in nutrient water or water-soaked inert material rather than in soil; hydroponics. [1/2 definitions] |
| arenaceous |
growing in sand or sandy soil. [1/2 definitions] |
| barren |
(usu. pl.) flat or slightly sloping area of infertile soil and scrubby vegetation. [1/5 definitions] |
| bedrock |
the solid layer of rock in the earth's surface, usu. beneath soil, sand, gravel, or the like. [1/3 definitions] |
| begrime |
to soil with or as though with grime; make grimy. |
| besmear |
to stain or soil by, or as if by, smearing. |
| besmirch |
to tarnish or soil. [1/2 definitions] |
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