This lecture will help you understand: Soils and agriculture
Increased yield per unit of land farmed
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It can include bedrock
Three kinds of weathering
B = subsoil C = parent material
Increased yield per unit of land farmed.
Begun in U.S.
and other developed nations
; exported to developing nations like India and those in Africa.
Soil as a system
: starting material affects composition of the resulting soil.
, the solid rock that makes up the Earth’s crust.
: the processes that break down rocks and minerals, and the first step in soil formation.
: the movement of soil from one area to another.
kinds of weathering
Physical or mechanical
of layers called
A = topsoil
B = subsoil
C = parent material
But most have O, A, E, B, C, and R
Organic or litter layer
Topsoil; mostly inorganic minerals with some organic material and humus mixed in;
crucial for plant growth
loss of minerals by
, a process whereby solid materials are dissolved and transported away
Subsoil; zone of accumulation or deposition of leached minerals
and organic acids from above
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