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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 scientific study of the use of soil for producing crops. |
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] |
amoeba |
a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope. |
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] |
bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes. |
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, found beneath soil, sand, or gravel. |
begrime |
to soil with or as though with grime; make grimy. |
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