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Terms in this set (36)
the part of the earth's surface consisting of humus and disintegrated rock
The breaking down of rocks and other materials on the Earth's surface.
Precise detailed study of the surface features of a region
organic, dark material remaining after decomposition by microorganisms
removal of dissolved materials from soil by water moving downwards
a loose material consisting of grains of rock or coral
a mixture of rich soil and tiny rocks
a very fine-grained soil that is plastic when moist but hard when fired
Rich, fertile soil that is made up of about equal parts of clay, sand, and silt.
horizontal layers that reveal a soil's history, characteristics, and usefulness
periphial view of the horizons in a soil.
The uppermost horizon of soil, primarily made up of organic material and humus
Topsoil material most important horizon; sediment we plow and plant crops
usually looses its mineral to b. Leached soil. No minerals.
subsoil horizon the rock has been weathered into fine grains, but no living things are present.
a rock formation that is the source of soil.
wastes left behind by earthworms
Symbiotic relationship of plant roots and fungi
the wearing away of surface soil by water and wind
natural resource conservation service
U.S. agency that promotes soil conservation, water quality protection and pollution control
Planting trees and crops together.
planting method in which farmers disturb surface topsoil and vegetation as little as possible
A method of conservation tillage that leaves both the surface and subsurface soil undisturbed
The practice of rotating use of different fields from crop to crop each year, to avoid exhausting the soil.
plowing fields along the curves of a slope to prevent soil loss
the practice of planting one or more crops between rows of other crops to control erosion
creating flat platforms in the hillside that provide a level planting surface, which reduces soil runoff from the slope.
Fertilizer composed of organic matter from plants and animals.
fertilizer produced commercially, normally with the use of fossil fuels
mixture of decaying organic matter used as fertilizer
a protective covering of rotting vegetable matter spread to reduce evaporation and soil erosion
Rows of trees planted by farmers to break the wind and prevent erosion.
food security act (farm bill)
a bill passed in 1985 that says farmers with erodible land must create a 5-year conservation plan. If they don't, they lose federal agricultural subsidies
conservation reserve program
farmers and ranchers are paid to keep damaged land out of production to promote recovery.
grasslands reserve program
a new program funded in the 2002 Farm Bill, pays farmers to protect virgin and improved pastureland for a period of at least 10 years
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