Summary Lecture

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Summary Lecture
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Concepts of Soil Genesis

• Concept 1 Pedogenic processes active in soils
  today have been operating over time and have
  varying degrees of expression over space.
  (Uniformatarianism)
• Concept 2 Many soil-forming processes proceed
  simultaneously in a soil, and the resulting
  profile reflects the balance of these processes,
  present and past.
• Concept 3 Distinctive regimes or combinations of
  processes produce distinctive soils.
• Concept 4 Five external factors of soil
  formation drive the internal pedogenic processes
  within the soil.
• Concept 5 Present day soils may carry the
  imprint of a combination of pedogenic processes
  that were active in the geologic past.

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Concepts of Soil Genesis

• Concept 6 A succession of different soils may
  have been present at a particular site as soil
  genetic factors changed.
• Concept 7 There are very few old soils (in a
  geologic sense).
• Concept 8 Complexity of soil genesis is much
  commoner than simplicity.
• Concept 9 Soils are natural clay factories.
• Concept 10 Knowledge of soil genesis is basic to
  classification and in mapping of soils as well as
  their use and management.

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