This lecture will help you understand: Soils and agriculture


Increased yield per unit of land farmed



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Increased yield per unit of land farmed.

Soil as a system

Soil formation

  • Parent material: starting material affects composition of the resulting soil.

  • It can include bedrock, the solid rock that makes up the Earth’s crust.

  • Weathering: the processes that break down rocks and minerals, and the first step in soil formation.

  • Erosion: the movement of soil from one area to another.

Three kinds of weathering

  • Physical or mechanical

  • Chemical

  • Biological

Soil profile

  • Simplest:

A = topsoil

B = subsoil

C = parent material

  • But most have O, A, E, B, C, and R

Soil profile

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